| |
| /*--------------------------------------------------------------------*/ |
| /*--- Management, printing, etc, of errors and suppressions. ---*/ |
| /*--- mc_errors.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of MemCheck, a heavyweight Valgrind tool for |
| detecting memory errors. |
| |
| Copyright (C) 2000-2010 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_tool_basics.h" |
| #include "pub_tool_gdbserver.h" |
| #include "pub_tool_hashtable.h" // For mc_include.h |
| #include "pub_tool_libcbase.h" |
| #include "pub_tool_libcassert.h" |
| #include "pub_tool_libcprint.h" |
| #include "pub_tool_machine.h" |
| #include "pub_tool_mallocfree.h" |
| #include "pub_tool_options.h" |
| #include "pub_tool_replacemalloc.h" |
| #include "pub_tool_tooliface.h" |
| #include "pub_tool_threadstate.h" |
| #include "pub_tool_debuginfo.h" // VG_(get_dataname_and_offset) |
| #include "pub_tool_xarray.h" |
| |
| #include "mc_include.h" |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Error types ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* See comment in mc_include.h */ |
| Bool MC_(any_value_errors) = False; |
| |
| |
| // Different kinds of blocks. |
| typedef enum { |
| Block_Mallocd = 111, |
| Block_Freed, |
| Block_Mempool, |
| Block_MempoolChunk, |
| Block_UserG |
| } BlockKind; |
| |
| /* ------------------ Addresses -------------------- */ |
| |
| /* The classification of a faulting address. */ |
| typedef |
| enum { |
| Addr_Undescribed, // as-yet unclassified |
| Addr_Unknown, // classification yielded nothing useful |
| Addr_Block, // in malloc'd/free'd block |
| Addr_Stack, // on a thread's stack |
| Addr_DataSym, // in a global data sym |
| Addr_Variable, // variable described by the debug info |
| Addr_SectKind // last-ditch classification attempt |
| } |
| AddrTag; |
| |
| typedef |
| struct _AddrInfo |
| AddrInfo; |
| |
| struct _AddrInfo { |
| AddrTag tag; |
| union { |
| // As-yet unclassified. |
| struct { } Undescribed; |
| |
| // On a stack. |
| struct { |
| ThreadId tid; // Which thread's stack? |
| } Stack; |
| |
| // This covers heap blocks (normal and from mempools) and user-defined |
| // blocks. |
| struct { |
| BlockKind block_kind; |
| Char* block_desc; // "block", "mempool" or user-defined |
| SizeT block_szB; |
| PtrdiffT rwoffset; |
| ExeContext* lastchange; |
| } Block; |
| |
| // In a global .data symbol. This holds the first 127 chars of |
| // the variable's name (zero terminated), plus a (memory) offset. |
| struct { |
| Char name[128]; |
| PtrdiffT offset; |
| } DataSym; |
| |
| // Is described by Dwarf debug info. XArray*s of HChar. |
| struct { |
| XArray* /* of HChar */ descr1; |
| XArray* /* of HChar */ descr2; |
| } Variable; |
| |
| // Could only narrow it down to be the PLT/GOT/etc of a given |
| // object. Better than nothing, perhaps. |
| struct { |
| Char objname[128]; |
| VgSectKind kind; |
| } SectKind; |
| |
| // Classification yielded nothing useful. |
| struct { } Unknown; |
| |
| } Addr; |
| }; |
| |
| /* ------------------ Errors ----------------------- */ |
| |
| /* What kind of error it is. */ |
| typedef |
| enum { |
| Err_Value, |
| Err_Cond, |
| Err_CoreMem, |
| Err_Addr, |
| Err_Jump, |
| Err_RegParam, |
| Err_MemParam, |
| Err_User, |
| Err_Free, |
| Err_FreeMismatch, |
| Err_Overlap, |
| Err_Leak, |
| Err_IllegalMempool, |
| } |
| MC_ErrorTag; |
| |
| |
| typedef struct _MC_Error MC_Error; |
| |
| struct _MC_Error { |
| // Nb: we don't need the tag here, as it's stored in the Error type! Yuk. |
| //MC_ErrorTag tag; |
| |
| union { |
| // Use of an undefined value: |
| // - as a pointer in a load or store |
| // - as a jump target |
| struct { |
| SizeT szB; // size of value in bytes |
| // Origin info |
| UInt otag; // origin tag |
| ExeContext* origin_ec; // filled in later |
| } Value; |
| |
| // Use of an undefined value in a conditional branch or move. |
| struct { |
| // Origin info |
| UInt otag; // origin tag |
| ExeContext* origin_ec; // filled in later |
| } Cond; |
| |
| // Addressability error in core (signal-handling) operation. |
| // It would be good to get rid of this error kind, merge it with |
| // another one somehow. |
| struct { |
| } CoreMem; |
| |
| // Use of an unaddressable memory location in a load or store. |
| struct { |
| Bool isWrite; // read or write? |
| SizeT szB; // not used for exec (jump) errors |
| Bool maybe_gcc; // True if just below %esp -- could be a gcc bug |
| AddrInfo ai; |
| } Addr; |
| |
| // Jump to an unaddressable memory location. |
| struct { |
| AddrInfo ai; |
| } Jump; |
| |
| // System call register input contains undefined bytes. |
| struct { |
| // Origin info |
| UInt otag; // origin tag |
| ExeContext* origin_ec; // filled in later |
| } RegParam; |
| |
| // System call memory input contains undefined/unaddressable bytes |
| struct { |
| Bool isAddrErr; // Addressability or definedness error? |
| AddrInfo ai; |
| // Origin info |
| UInt otag; // origin tag |
| ExeContext* origin_ec; // filled in later |
| } MemParam; |
| |
| // Problem found from a client request like CHECK_MEM_IS_ADDRESSABLE. |
| struct { |
| Bool isAddrErr; // Addressability or definedness error? |
| AddrInfo ai; |
| // Origin info |
| UInt otag; // origin tag |
| ExeContext* origin_ec; // filled in later |
| } User; |
| |
| // Program tried to free() something that's not a heap block (this |
| // covers double-frees). */ |
| struct { |
| AddrInfo ai; |
| } Free; |
| |
| // Program allocates heap block with one function |
| // (malloc/new/new[]/custom) and deallocates with not the matching one. |
| struct { |
| AddrInfo ai; |
| } FreeMismatch; |
| |
| // Call to strcpy, memcpy, etc, with overlapping blocks. |
| struct { |
| Addr src; // Source block |
| Addr dst; // Destination block |
| Int szB; // Size in bytes; 0 if unused. |
| } Overlap; |
| |
| // A memory leak. |
| struct { |
| UInt n_this_record; |
| UInt n_total_records; |
| LossRecord* lr; |
| } Leak; |
| |
| // A memory pool error. |
| struct { |
| AddrInfo ai; |
| } IllegalMempool; |
| |
| } Err; |
| }; |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Printing errors ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* This is the "this error is due to be printed shortly; so have a |
| look at it any print any preamble you want" function. Which, in |
| Memcheck, we don't use. Hence a no-op. |
| */ |
| void MC_(before_pp_Error) ( Error* err ) { |
| } |
| |
| /* Do a printf-style operation on either the XML or normal output |
| channel, depending on the setting of VG_(clo_xml). |
| */ |
| static void emit_WRK ( HChar* format, va_list vargs ) |
| { |
| if (VG_(clo_xml)) { |
| VG_(vprintf_xml)(format, vargs); |
| } else { |
| VG_(vmessage)(Vg_UserMsg, format, vargs); |
| } |
| } |
| static void emit ( HChar* format, ... ) PRINTF_CHECK(1, 2); |
| static void emit ( HChar* format, ... ) |
| { |
| va_list vargs; |
| va_start(vargs, format); |
| emit_WRK(format, vargs); |
| va_end(vargs); |
| } |
| static void emiN ( HChar* format, ... ) /* NO FORMAT CHECK */ |
| { |
| va_list vargs; |
| va_start(vargs, format); |
| emit_WRK(format, vargs); |
| va_end(vargs); |
| } |
| |
| |
| static void mc_pp_AddrInfo ( Addr a, AddrInfo* ai, Bool maybe_gcc ) |
| { |
| HChar* xpre = VG_(clo_xml) ? " <auxwhat>" : " "; |
| HChar* xpost = VG_(clo_xml) ? "</auxwhat>" : ""; |
| |
| switch (ai->tag) { |
| case Addr_Unknown: |
| if (maybe_gcc) { |
| emit( "%sAddress 0x%llx is just below the stack ptr. " |
| "To suppress, use: --workaround-gcc296-bugs=yes%s\n", |
| xpre, (ULong)a, xpost ); |
| } else { |
| emit( "%sAddress 0x%llx " |
| "is not stack'd, malloc'd or (recently) free'd%s\n", |
| xpre, (ULong)a, xpost ); |
| } |
| break; |
| |
| case Addr_Stack: |
| emit( "%sAddress 0x%llx is on thread %d's stack%s\n", |
| xpre, (ULong)a, ai->Addr.Stack.tid, xpost ); |
| break; |
| |
| case Addr_Block: { |
| SizeT block_szB = ai->Addr.Block.block_szB; |
| PtrdiffT rwoffset = ai->Addr.Block.rwoffset; |
| SizeT delta; |
| const Char* relative; |
| |
| if (rwoffset < 0) { |
| delta = (SizeT)(-rwoffset); |
| relative = "before"; |
| } else if (rwoffset >= block_szB) { |
| delta = rwoffset - block_szB; |
| relative = "after"; |
| } else { |
| delta = rwoffset; |
| relative = "inside"; |
| } |
| emit( |
| "%sAddress 0x%lx is %'lu bytes %s a %s of size %'lu %s%s\n", |
| xpre, |
| a, delta, relative, ai->Addr.Block.block_desc, |
| block_szB, |
| ai->Addr.Block.block_kind==Block_Mallocd ? "alloc'd" |
| : ai->Addr.Block.block_kind==Block_Freed ? "free'd" |
| : "client-defined", |
| xpost |
| ); |
| VG_(pp_ExeContext)(ai->Addr.Block.lastchange); |
| break; |
| } |
| |
| case Addr_DataSym: |
| emiN( "%sAddress 0x%llx is %llu bytes " |
| "inside data symbol \"%t\"%s\n", |
| xpre, |
| (ULong)a, |
| (ULong)ai->Addr.DataSym.offset, |
| ai->Addr.DataSym.name, |
| xpost ); |
| break; |
| |
| case Addr_Variable: |
| /* Note, no need for XML tags here, because descr1/2 will |
| already have <auxwhat> or <xauxwhat>s on them, in XML |
| mode. */ |
| if (ai->Addr.Variable.descr1) |
| emit( "%s%s\n", |
| VG_(clo_xml) ? " " : " ", |
| (HChar*)VG_(indexXA)(ai->Addr.Variable.descr1, 0) ); |
| if (ai->Addr.Variable.descr2) |
| emit( "%s%s\n", |
| VG_(clo_xml) ? " " : " ", |
| (HChar*)VG_(indexXA)(ai->Addr.Variable.descr2, 0) ); |
| break; |
| |
| case Addr_SectKind: |
| emiN( "%sAddress 0x%llx is in the %t segment of %t%s\n", |
| xpre, |
| (ULong)a, |
| VG_(pp_SectKind)(ai->Addr.SectKind.kind), |
| ai->Addr.SectKind.objname, |
| xpost ); |
| break; |
| |
| default: |
| VG_(tool_panic)("mc_pp_AddrInfo"); |
| } |
| } |
| |
| static const HChar* str_leak_lossmode ( Reachedness lossmode ) |
| { |
| const HChar *loss = "?"; |
| switch (lossmode) { |
| case Unreached: loss = "definitely lost"; break; |
| case IndirectLeak: loss = "indirectly lost"; break; |
| case Possible: loss = "possibly lost"; break; |
| case Reachable: loss = "still reachable"; break; |
| } |
| return loss; |
| } |
| |
| static const HChar* xml_leak_kind ( Reachedness lossmode ) |
| { |
| const HChar *loss = "?"; |
| switch (lossmode) { |
| case Unreached: loss = "Leak_DefinitelyLost"; break; |
| case IndirectLeak: loss = "Leak_IndirectlyLost"; break; |
| case Possible: loss = "Leak_PossiblyLost"; break; |
| case Reachable: loss = "Leak_StillReachable"; break; |
| } |
| return loss; |
| } |
| |
| static void mc_pp_origin ( ExeContext* ec, UInt okind ) |
| { |
| HChar* src = NULL; |
| tl_assert(ec); |
| |
| switch (okind) { |
| case MC_OKIND_STACK: src = " by a stack allocation"; break; |
| case MC_OKIND_HEAP: src = " by a heap allocation"; break; |
| case MC_OKIND_USER: src = " by a client request"; break; |
| case MC_OKIND_UNKNOWN: src = ""; break; |
| } |
| tl_assert(src); /* guards against invalid 'okind' */ |
| |
| if (VG_(clo_xml)) { |
| emit( " <auxwhat>Uninitialised value was created%s</auxwhat>\n", |
| src); |
| VG_(pp_ExeContext)( ec ); |
| } else { |
| emit( " Uninitialised value was created%s\n", src); |
| VG_(pp_ExeContext)( ec ); |
| } |
| } |
| |
| void MC_(pp_Error) ( Error* err ) |
| { |
| const Bool xml = VG_(clo_xml); /* a shorthand */ |
| MC_Error* extra = VG_(get_error_extra)(err); |
| |
| switch (VG_(get_error_kind)(err)) { |
| case Err_CoreMem: |
| /* What the hell *is* a CoreMemError? jrs 2005-May-18 */ |
| /* As of 2006-Dec-14, it's caused by unaddressable bytes in a |
| signal handler frame. --njn */ |
| // JRS 17 May 09: None of our regtests exercise this; hence AFAIK |
| // the following code is untested. Bad. |
| if (xml) { |
| emit( " <kind>CoreMemError</kind>\n" ); |
| emiN( " <what>%t contains unaddressable byte(s)</what>\n", |
| VG_(get_error_string)(err)); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| } else { |
| emit( "%s contains unaddressable byte(s)\n", |
| VG_(get_error_string)(err)); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| } |
| break; |
| |
| case Err_Value: |
| MC_(any_value_errors) = True; |
| if (xml) { |
| emit( " <kind>UninitValue</kind>\n" ); |
| emit( " <what>Use of uninitialised value of size %ld</what>\n", |
| extra->Err.Value.szB ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.Value.origin_ec) |
| mc_pp_origin( extra->Err.Value.origin_ec, |
| extra->Err.Value.otag & 3 ); |
| } else { |
| /* Could also show extra->Err.Cond.otag if debugging origin |
| tracking */ |
| emit( "Use of uninitialised value of size %ld\n", |
| extra->Err.Value.szB ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.Value.origin_ec) |
| mc_pp_origin( extra->Err.Value.origin_ec, |
| extra->Err.Value.otag & 3 ); |
| } |
| break; |
| |
| case Err_Cond: |
| MC_(any_value_errors) = True; |
| if (xml) { |
| emit( " <kind>UninitCondition</kind>\n" ); |
| emit( " <what>Conditional jump or move depends" |
| " on uninitialised value(s)</what>\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.Cond.origin_ec) |
| mc_pp_origin( extra->Err.Cond.origin_ec, |
| extra->Err.Cond.otag & 3 ); |
| } else { |
| /* Could also show extra->Err.Cond.otag if debugging origin |
| tracking */ |
| emit( "Conditional jump or move depends" |
| " on uninitialised value(s)\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.Cond.origin_ec) |
| mc_pp_origin( extra->Err.Cond.origin_ec, |
| extra->Err.Cond.otag & 3 ); |
| } |
| break; |
| |
| case Err_RegParam: |
| MC_(any_value_errors) = True; |
| if (xml) { |
| emit( " <kind>SyscallParam</kind>\n" ); |
| emiN( " <what>Syscall param %t contains " |
| "uninitialised byte(s)</what>\n", |
| VG_(get_error_string)(err) ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.RegParam.origin_ec) |
| mc_pp_origin( extra->Err.RegParam.origin_ec, |
| extra->Err.RegParam.otag & 3 ); |
| } else { |
| emit( "Syscall param %s contains uninitialised byte(s)\n", |
| VG_(get_error_string)(err) ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| if (extra->Err.RegParam.origin_ec) |
| mc_pp_origin( extra->Err.RegParam.origin_ec, |
| extra->Err.RegParam.otag & 3 ); |
| } |
| break; |
| |
| case Err_MemParam: |
| if (!extra->Err.MemParam.isAddrErr) |
| MC_(any_value_errors) = True; |
| if (xml) { |
| emit( " <kind>SyscallParam</kind>\n" ); |
| emiN( " <what>Syscall param %t points to %s byte(s)</what>\n", |
| VG_(get_error_string)(err), |
| extra->Err.MemParam.isAddrErr |
| ? "unaddressable" : "uninitialised" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), |
| &extra->Err.MemParam.ai, False); |
| if (extra->Err.MemParam.origin_ec |
| && !extra->Err.MemParam.isAddrErr) |
| mc_pp_origin( extra->Err.MemParam.origin_ec, |
| extra->Err.MemParam.otag & 3 ); |
| } else { |
| emit( "Syscall param %s points to %s byte(s)\n", |
| VG_(get_error_string)(err), |
| extra->Err.MemParam.isAddrErr |
| ? "unaddressable" : "uninitialised" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), |
| &extra->Err.MemParam.ai, False); |
| if (extra->Err.MemParam.origin_ec |
| && !extra->Err.MemParam.isAddrErr) |
| mc_pp_origin( extra->Err.MemParam.origin_ec, |
| extra->Err.MemParam.otag & 3 ); |
| } |
| break; |
| |
| case Err_User: |
| if (!extra->Err.User.isAddrErr) |
| MC_(any_value_errors) = True; |
| if (xml) { |
| emit( " <kind>ClientCheck</kind>\n" ); |
| emit( " <what>%s byte(s) found " |
| "during client check request</what>\n", |
| extra->Err.User.isAddrErr |
| ? "Unaddressable" : "Uninitialised" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), &extra->Err.User.ai, |
| False); |
| if (extra->Err.User.origin_ec && !extra->Err.User.isAddrErr) |
| mc_pp_origin( extra->Err.User.origin_ec, |
| extra->Err.User.otag & 3 ); |
| } else { |
| emit( "%s byte(s) found during client check request\n", |
| extra->Err.User.isAddrErr |
| ? "Unaddressable" : "Uninitialised" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), &extra->Err.User.ai, |
| False); |
| if (extra->Err.User.origin_ec && !extra->Err.User.isAddrErr) |
| mc_pp_origin( extra->Err.User.origin_ec, |
| extra->Err.User.otag & 3 ); |
| } |
| break; |
| |
| case Err_Free: |
| if (xml) { |
| emit( " <kind>InvalidFree</kind>\n" ); |
| emit( " <what>Invalid free() / delete / delete[]" |
| " / realloc()</what>\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.Free.ai, False ); |
| } else { |
| emit( "Invalid free() / delete / delete[] / realloc()\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.Free.ai, False ); |
| } |
| break; |
| |
| case Err_FreeMismatch: |
| if (xml) { |
| emit( " <kind>MismatchedFree</kind>\n" ); |
| emit( " <what>Mismatched free() / delete / delete []</what>\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), |
| &extra->Err.FreeMismatch.ai, False); |
| } else { |
| emit( "Mismatched free() / delete / delete []\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo(VG_(get_error_address)(err), |
| &extra->Err.FreeMismatch.ai, False); |
| } |
| break; |
| |
| case Err_Addr: |
| if (xml) { |
| emit( " <kind>Invalid%s</kind>\n", |
| extra->Err.Addr.isWrite ? "Write" : "Read" ); |
| emit( " <what>Invalid %s of size %ld</what>\n", |
| extra->Err.Addr.isWrite ? "write" : "read", |
| extra->Err.Addr.szB ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.Addr.ai, |
| extra->Err.Addr.maybe_gcc ); |
| } else { |
| emit( "Invalid %s of size %ld\n", |
| extra->Err.Addr.isWrite ? "write" : "read", |
| extra->Err.Addr.szB ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.Addr.ai, |
| extra->Err.Addr.maybe_gcc ); |
| } |
| break; |
| |
| case Err_Jump: |
| if (xml) { |
| emit( " <kind>InvalidJump</kind>\n" ); |
| emit( " <what>Jump to the invalid address stated " |
| "on the next line</what>\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), &extra->Err.Jump.ai, |
| False ); |
| } else { |
| emit( "Jump to the invalid address stated on the next line\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), &extra->Err.Jump.ai, |
| False ); |
| } |
| break; |
| |
| case Err_Overlap: |
| if (xml) { |
| emit( " <kind>Overlap</kind>\n" ); |
| if (extra->Err.Overlap.szB == 0) { |
| emiN( " <what>Source and destination overlap " |
| "in %t(%#lx, %#lx)\n</what>\n", |
| VG_(get_error_string)(err), |
| extra->Err.Overlap.dst, extra->Err.Overlap.src ); |
| } else { |
| emit( " <what>Source and destination overlap " |
| "in %s(%#lx, %#lx, %d)</what>\n", |
| VG_(get_error_string)(err), |
| extra->Err.Overlap.dst, extra->Err.Overlap.src, |
| extra->Err.Overlap.szB ); |
| } |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| } else { |
| if (extra->Err.Overlap.szB == 0) { |
| emiN( "Source and destination overlap in %t(%#lx, %#lx)\n", |
| VG_(get_error_string)(err), |
| extra->Err.Overlap.dst, extra->Err.Overlap.src ); |
| } else { |
| emit( "Source and destination overlap in %s(%#lx, %#lx, %d)\n", |
| VG_(get_error_string)(err), |
| extra->Err.Overlap.dst, extra->Err.Overlap.src, |
| extra->Err.Overlap.szB ); |
| } |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| } |
| break; |
| |
| case Err_IllegalMempool: |
| // JRS 17 May 09: None of our regtests exercise this; hence AFAIK |
| // the following code is untested. Bad. |
| if (xml) { |
| emit( " <kind>InvalidMemPool</kind>\n" ); |
| emit( " <what>Illegal memory pool address</what>\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.IllegalMempool.ai, False ); |
| } else { |
| emit( "Illegal memory pool address\n" ); |
| VG_(pp_ExeContext)( VG_(get_error_where)(err) ); |
| mc_pp_AddrInfo( VG_(get_error_address)(err), |
| &extra->Err.IllegalMempool.ai, False ); |
| } |
| break; |
| |
| case Err_Leak: { |
| UInt n_this_record = extra->Err.Leak.n_this_record; |
| UInt n_total_records = extra->Err.Leak.n_total_records; |
| LossRecord* lr = extra->Err.Leak.lr; |
| if (xml) { |
| emit(" <kind>%s</kind>\n", xml_leak_kind(lr->key.state)); |
| if (lr->indirect_szB > 0) { |
| emit( " <xwhat>\n" ); |
| emit( " <text>%'lu (%'lu direct, %'lu indirect) bytes " |
| "in %'u blocks" |
| " are %s in loss record %'u of %'u</text>\n", |
| lr->szB + lr->indirect_szB, lr->szB, lr->indirect_szB, |
| lr->num_blocks, |
| str_leak_lossmode(lr->key.state), |
| n_this_record, n_total_records ); |
| // Nb: don't put commas in these XML numbers |
| emit( " <leakedbytes>%lu</leakedbytes>\n", |
| lr->szB + lr->indirect_szB ); |
| emit( " <leakedblocks>%u</leakedblocks>\n", lr->num_blocks ); |
| emit( " </xwhat>\n" ); |
| } else { |
| emit( " <xwhat>\n" ); |
| emit( " <text>%'lu bytes in %'u blocks" |
| " are %s in loss record %'u of %'u</text>\n", |
| lr->szB, lr->num_blocks, |
| str_leak_lossmode(lr->key.state), |
| n_this_record, n_total_records ); |
| emit( " <leakedbytes>%ld</leakedbytes>\n", lr->szB); |
| emit( " <leakedblocks>%d</leakedblocks>\n", lr->num_blocks); |
| emit( " </xwhat>\n" ); |
| } |
| VG_(pp_ExeContext)(lr->key.allocated_at); |
| } else { /* ! if (xml) */ |
| if (lr->indirect_szB > 0) { |
| emit( |
| "%'lu (%'lu direct, %'lu indirect) bytes in %'u blocks" |
| " are %s in loss record %'u of %'u\n", |
| lr->szB + lr->indirect_szB, lr->szB, lr->indirect_szB, |
| lr->num_blocks, str_leak_lossmode(lr->key.state), |
| n_this_record, n_total_records |
| ); |
| } else { |
| emit( |
| "%'lu bytes in %'u blocks are %s in loss record %'u of %'u\n", |
| lr->szB, lr->num_blocks, str_leak_lossmode(lr->key.state), |
| n_this_record, n_total_records |
| ); |
| } |
| VG_(pp_ExeContext)(lr->key.allocated_at); |
| } /* if (xml) */ |
| break; |
| } |
| |
| default: |
| VG_(printf)("Error:\n unknown Memcheck error code %d\n", |
| VG_(get_error_kind)(err)); |
| VG_(tool_panic)("unknown error code in mc_pp_Error)"); |
| } |
| } |
| |
| /*------------------------------------------------------------*/ |
| /*--- Recording errors ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* These many bytes below %ESP are considered addressible if we're |
| doing the --workaround-gcc296-bugs hack. */ |
| #define VG_GCC296_BUG_STACK_SLOP 1024 |
| |
| /* Is this address within some small distance below %ESP? Used only |
| for the --workaround-gcc296-bugs kludge. */ |
| static Bool is_just_below_ESP( Addr esp, Addr aa ) |
| { |
| esp -= VG_STACK_REDZONE_SZB; |
| if (esp > aa && (esp - aa) <= VG_GCC296_BUG_STACK_SLOP) |
| return True; |
| else |
| return False; |
| } |
| |
| /* --- Called from generated and non-generated code --- */ |
| |
| void MC_(record_address_error) ( ThreadId tid, Addr a, Int szB, |
| Bool isWrite ) |
| { |
| MC_Error extra; |
| Bool just_below_esp; |
| |
| if (MC_(in_ignored_range)(a)) |
| return; |
| |
| if (VG_(is_watched)( (isWrite ? write_watchpoint : read_watchpoint), a, szB)) |
| return; |
| |
| # if defined(VGP_ppc32_aix5) || defined(VGP_ppc64_aix5) |
| /* AIX zero-page handling. On AIX, reads from page zero are, |
| bizarrely enough, legitimate. Writes to page zero aren't, |
| though. Since memcheck can't distinguish reads from writes, the |
| best we can do is to 'act normal' and mark the A bits in the |
| normal way as noaccess, but then hide any reads from that page |
| that get reported here. */ |
| if ((!isWrite) && a >= 0 && a < 4096 && a+szB <= 4096) |
| return; |
| |
| /* Appalling AIX hack. It suppresses reads done by glink |
| fragments. Getting rid of this would require figuring out |
| somehow where the referenced data areas are (and their |
| sizes). */ |
| if ((!isWrite) && szB == sizeof(Word)) { |
| UInt i1, i2; |
| UInt* pc = (UInt*)VG_(get_IP)(tid); |
| if (sizeof(Word) == 4) { |
| i1 = 0x800c0000; /* lwz r0,0(r12) */ |
| i2 = 0x804c0004; /* lwz r2,4(r12) */ |
| } else { |
| i1 = 0xe80c0000; /* ld r0,0(r12) */ |
| i2 = 0xe84c0008; /* ld r2,8(r12) */ |
| } |
| if (pc[0] == i1 && pc[1] == i2) return; |
| if (pc[0] == i2 && pc[-1] == i1) return; |
| } |
| # endif |
| |
| just_below_esp = is_just_below_ESP( VG_(get_SP)(tid), a ); |
| |
| /* If this is caused by an access immediately below %ESP, and the |
| user asks nicely, we just ignore it. */ |
| if (MC_(clo_workaround_gcc296_bugs) && just_below_esp) |
| return; |
| |
| extra.Err.Addr.isWrite = isWrite; |
| extra.Err.Addr.szB = szB; |
| extra.Err.Addr.maybe_gcc = just_below_esp; |
| extra.Err.Addr.ai.tag = Addr_Undescribed; |
| VG_(maybe_record_error)( tid, Err_Addr, a, /*s*/NULL, &extra ); |
| } |
| |
| void MC_(record_value_error) ( ThreadId tid, Int szB, UInt otag ) |
| { |
| MC_Error extra; |
| tl_assert( MC_(clo_mc_level) >= 2 ); |
| if (otag > 0) |
| tl_assert( MC_(clo_mc_level) == 3 ); |
| extra.Err.Value.szB = szB; |
| extra.Err.Value.otag = otag; |
| extra.Err.Value.origin_ec = NULL; /* Filled in later */ |
| VG_(maybe_record_error)( tid, Err_Value, /*addr*/0, /*s*/NULL, &extra ); |
| } |
| |
| void MC_(record_cond_error) ( ThreadId tid, UInt otag ) |
| { |
| MC_Error extra; |
| tl_assert( MC_(clo_mc_level) >= 2 ); |
| if (otag > 0) |
| tl_assert( MC_(clo_mc_level) == 3 ); |
| extra.Err.Cond.otag = otag; |
| extra.Err.Cond.origin_ec = NULL; /* Filled in later */ |
| VG_(maybe_record_error)( tid, Err_Cond, /*addr*/0, /*s*/NULL, &extra ); |
| } |
| |
| /* --- Called from non-generated code --- */ |
| |
| /* This is for memory errors in signal-related memory. */ |
| void MC_(record_core_mem_error) ( ThreadId tid, Char* msg ) |
| { |
| VG_(maybe_record_error)( tid, Err_CoreMem, /*addr*/0, msg, /*extra*/NULL ); |
| } |
| |
| void MC_(record_regparam_error) ( ThreadId tid, Char* msg, UInt otag ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| if (otag > 0) |
| tl_assert( MC_(clo_mc_level) == 3 ); |
| extra.Err.RegParam.otag = otag; |
| extra.Err.RegParam.origin_ec = NULL; /* Filled in later */ |
| VG_(maybe_record_error)( tid, Err_RegParam, /*addr*/0, msg, &extra ); |
| } |
| |
| void MC_(record_memparam_error) ( ThreadId tid, Addr a, |
| Bool isAddrErr, Char* msg, UInt otag ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| if (!isAddrErr) |
| tl_assert( MC_(clo_mc_level) >= 2 ); |
| if (otag != 0) { |
| tl_assert( MC_(clo_mc_level) == 3 ); |
| tl_assert( !isAddrErr ); |
| } |
| extra.Err.MemParam.isAddrErr = isAddrErr; |
| extra.Err.MemParam.ai.tag = Addr_Undescribed; |
| extra.Err.MemParam.otag = otag; |
| extra.Err.MemParam.origin_ec = NULL; /* Filled in later */ |
| VG_(maybe_record_error)( tid, Err_MemParam, a, msg, &extra ); |
| } |
| |
| void MC_(record_jump_error) ( ThreadId tid, Addr a ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| extra.Err.Jump.ai.tag = Addr_Undescribed; |
| VG_(maybe_record_error)( tid, Err_Jump, a, /*s*/NULL, &extra ); |
| } |
| |
| void MC_(record_free_error) ( ThreadId tid, Addr a ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| extra.Err.Free.ai.tag = Addr_Undescribed; |
| VG_(maybe_record_error)( tid, Err_Free, a, /*s*/NULL, &extra ); |
| } |
| |
| void MC_(record_freemismatch_error) ( ThreadId tid, MC_Chunk* mc ) |
| { |
| MC_Error extra; |
| AddrInfo* ai = &extra.Err.FreeMismatch.ai; |
| tl_assert(VG_INVALID_THREADID != tid); |
| ai->tag = Addr_Block; |
| ai->Addr.Block.block_kind = Block_Mallocd; // Nb: Not 'Block_Freed' |
| ai->Addr.Block.block_desc = "block"; |
| ai->Addr.Block.block_szB = mc->szB; |
| ai->Addr.Block.rwoffset = 0; |
| ai->Addr.Block.lastchange = mc->where; |
| VG_(maybe_record_error)( tid, Err_FreeMismatch, mc->data, /*s*/NULL, |
| &extra ); |
| } |
| |
| void MC_(record_illegal_mempool_error) ( ThreadId tid, Addr a ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| extra.Err.IllegalMempool.ai.tag = Addr_Undescribed; |
| VG_(maybe_record_error)( tid, Err_IllegalMempool, a, /*s*/NULL, &extra ); |
| } |
| |
| void MC_(record_overlap_error) ( ThreadId tid, Char* function, |
| Addr src, Addr dst, SizeT szB ) |
| { |
| MC_Error extra; |
| tl_assert(VG_INVALID_THREADID != tid); |
| extra.Err.Overlap.src = src; |
| extra.Err.Overlap.dst = dst; |
| extra.Err.Overlap.szB = szB; |
| VG_(maybe_record_error)( |
| tid, Err_Overlap, /*addr*/0, /*s*/function, &extra ); |
| } |
| |
| Bool MC_(record_leak_error) ( ThreadId tid, UInt n_this_record, |
| UInt n_total_records, LossRecord* lr, |
| Bool print_record, Bool count_error ) |
| { |
| MC_Error extra; |
| extra.Err.Leak.n_this_record = n_this_record; |
| extra.Err.Leak.n_total_records = n_total_records; |
| extra.Err.Leak.lr = lr; |
| return |
| VG_(unique_error) ( tid, Err_Leak, /*Addr*/0, /*s*/NULL, &extra, |
| lr->key.allocated_at, print_record, |
| /*allow_GDB_attach*/False, count_error ); |
| } |
| |
| void MC_(record_user_error) ( ThreadId tid, Addr a, |
| Bool isAddrErr, UInt otag ) |
| { |
| MC_Error extra; |
| if (otag != 0) { |
| tl_assert(!isAddrErr); |
| tl_assert( MC_(clo_mc_level) == 3 ); |
| } |
| if (!isAddrErr) { |
| tl_assert( MC_(clo_mc_level) >= 2 ); |
| } |
| tl_assert(VG_INVALID_THREADID != tid); |
| extra.Err.User.isAddrErr = isAddrErr; |
| extra.Err.User.ai.tag = Addr_Undescribed; |
| extra.Err.User.otag = otag; |
| extra.Err.User.origin_ec = NULL; /* Filled in later */ |
| VG_(maybe_record_error)( tid, Err_User, a, /*s*/NULL, &extra ); |
| } |
| |
| /*------------------------------------------------------------*/ |
| /*--- Other error operations ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Compare error contexts, to detect duplicates. Note that if they |
| are otherwise the same, the faulting addrs and associated rwoffsets |
| are allowed to be different. */ |
| Bool MC_(eq_Error) ( VgRes res, Error* e1, Error* e2 ) |
| { |
| MC_Error* extra1 = VG_(get_error_extra)(e1); |
| MC_Error* extra2 = VG_(get_error_extra)(e2); |
| |
| /* Guaranteed by calling function */ |
| tl_assert(VG_(get_error_kind)(e1) == VG_(get_error_kind)(e2)); |
| |
| switch (VG_(get_error_kind)(e1)) { |
| case Err_CoreMem: { |
| Char *e1s, *e2s; |
| e1s = VG_(get_error_string)(e1); |
| e2s = VG_(get_error_string)(e2); |
| if (e1s == e2s) return True; |
| if (VG_STREQ(e1s, e2s)) return True; |
| return False; |
| } |
| |
| case Err_RegParam: |
| return VG_STREQ(VG_(get_error_string)(e1), VG_(get_error_string)(e2)); |
| |
| // Perhaps we should also check the addrinfo.akinds for equality. |
| // That would result in more error reports, but only in cases where |
| // a register contains uninitialised bytes and points to memory |
| // containing uninitialised bytes. Currently, the 2nd of those to be |
| // detected won't be reported. That is (nearly?) always the memory |
| // error, which is good. |
| case Err_MemParam: |
| if (!VG_STREQ(VG_(get_error_string)(e1), |
| VG_(get_error_string)(e2))) return False; |
| // fall through |
| case Err_User: |
| return ( extra1->Err.User.isAddrErr == extra2->Err.User.isAddrErr |
| ? True : False ); |
| |
| case Err_Free: |
| case Err_FreeMismatch: |
| case Err_Jump: |
| case Err_IllegalMempool: |
| case Err_Overlap: |
| case Err_Cond: |
| return True; |
| |
| case Err_Addr: |
| return ( extra1->Err.Addr.szB == extra2->Err.Addr.szB |
| ? True : False ); |
| |
| case Err_Value: |
| return ( extra1->Err.Value.szB == extra2->Err.Value.szB |
| ? True : False ); |
| |
| case Err_Leak: |
| VG_(tool_panic)("Shouldn't get Err_Leak in mc_eq_Error,\n" |
| "since it's handled with VG_(unique_error)()!"); |
| |
| default: |
| VG_(printf)("Error:\n unknown error code %d\n", |
| VG_(get_error_kind)(e1)); |
| VG_(tool_panic)("unknown error code in mc_eq_Error"); |
| } |
| } |
| |
| /* Functions used when searching MC_Chunk lists */ |
| static |
| Bool addr_is_in_MC_Chunk_default_REDZONE_SZB(MC_Chunk* mc, Addr a) |
| { |
| return VG_(addr_is_in_block)( a, mc->data, mc->szB, |
| MC_MALLOC_REDZONE_SZB ); |
| } |
| static |
| Bool addr_is_in_MC_Chunk_with_REDZONE_SZB(MC_Chunk* mc, Addr a, SizeT rzB) |
| { |
| return VG_(addr_is_in_block)( a, mc->data, mc->szB, |
| rzB ); |
| } |
| |
| // Forward declarations |
| static Bool client_block_maybe_describe( Addr a, AddrInfo* ai ); |
| static Bool mempool_block_maybe_describe( Addr a, AddrInfo* ai ); |
| |
| |
| /* Describe an address as best you can, for error messages, |
| putting the result in ai. */ |
| static void describe_addr ( Addr a, /*OUT*/AddrInfo* ai ) |
| { |
| MC_Chunk* mc; |
| ThreadId tid; |
| Addr stack_min, stack_max; |
| VgSectKind sect; |
| |
| tl_assert(Addr_Undescribed == ai->tag); |
| |
| /* -- Perhaps it's a user-named block? -- */ |
| if (client_block_maybe_describe( a, ai )) { |
| return; |
| } |
| /* -- Perhaps it's in mempool block? -- */ |
| if (mempool_block_maybe_describe( a, ai )) { |
| return; |
| } |
| /* -- Search for a recently freed block which might bracket it. -- */ |
| mc = MC_(get_freed_list_head)(); |
| while (mc) { |
| if (addr_is_in_MC_Chunk_default_REDZONE_SZB(mc, a)) { |
| ai->tag = Addr_Block; |
| ai->Addr.Block.block_kind = Block_Freed; |
| ai->Addr.Block.block_desc = "block"; |
| ai->Addr.Block.block_szB = mc->szB; |
| ai->Addr.Block.rwoffset = (Word)a - (Word)mc->data; |
| ai->Addr.Block.lastchange = mc->where; |
| return; |
| } |
| mc = mc->next; |
| } |
| /* -- Search for a currently malloc'd block which might bracket it. -- */ |
| VG_(HT_ResetIter)(MC_(malloc_list)); |
| while ( (mc = VG_(HT_Next)(MC_(malloc_list))) ) { |
| if (addr_is_in_MC_Chunk_default_REDZONE_SZB(mc, a)) { |
| ai->tag = Addr_Block; |
| ai->Addr.Block.block_kind = Block_Mallocd; |
| ai->Addr.Block.block_desc = "block"; |
| ai->Addr.Block.block_szB = mc->szB; |
| ai->Addr.Block.rwoffset = (Word)a - (Word)mc->data; |
| ai->Addr.Block.lastchange = mc->where; |
| return; |
| } |
| } |
| /* -- Perhaps the variable type/location data describes it? -- */ |
| ai->Addr.Variable.descr1 |
| = VG_(newXA)( VG_(malloc), "mc.da.descr1", |
| VG_(free), sizeof(HChar) ); |
| ai->Addr.Variable.descr2 |
| = VG_(newXA)( VG_(malloc), "mc.da.descr2", |
| VG_(free), sizeof(HChar) ); |
| |
| (void) VG_(get_data_description)( ai->Addr.Variable.descr1, |
| ai->Addr.Variable.descr2, a ); |
| /* If there's nothing in descr1/2, free them. Why is it safe to to |
| VG_(indexXA) at zero here? Because VG_(get_data_description) |
| guarantees to zero terminate descr1/2 regardless of the outcome |
| of the call. So there's always at least one element in each XA |
| after the call. |
| */ |
| if (0 == VG_(strlen)( VG_(indexXA)( ai->Addr.Variable.descr1, 0 ))) { |
| VG_(deleteXA)( ai->Addr.Variable.descr1 ); |
| ai->Addr.Variable.descr1 = NULL; |
| } |
| if (0 == VG_(strlen)( VG_(indexXA)( ai->Addr.Variable.descr2, 0 ))) { |
| VG_(deleteXA)( ai->Addr.Variable.descr2 ); |
| ai->Addr.Variable.descr2 = NULL; |
| } |
| /* Assume (assert) that VG_(get_data_description) fills in descr1 |
| before it fills in descr2 */ |
| if (ai->Addr.Variable.descr1 == NULL) |
| tl_assert(ai->Addr.Variable.descr2 == NULL); |
| /* So did we get lucky? */ |
| if (ai->Addr.Variable.descr1 != NULL) { |
| ai->tag = Addr_Variable; |
| return; |
| } |
| /* -- Have a look at the low level data symbols - perhaps it's in |
| there. -- */ |
| VG_(memset)( &ai->Addr.DataSym.name, |
| 0, sizeof(ai->Addr.DataSym.name)); |
| if (VG_(get_datasym_and_offset)( |
| a, &ai->Addr.DataSym.name[0], |
| sizeof(ai->Addr.DataSym.name)-1, |
| &ai->Addr.DataSym.offset )) { |
| ai->tag = Addr_DataSym; |
| tl_assert( ai->Addr.DataSym.name |
| [ sizeof(ai->Addr.DataSym.name)-1 ] == 0); |
| return; |
| } |
| /* -- Perhaps it's on a thread's stack? -- */ |
| VG_(thread_stack_reset_iter)(&tid); |
| while ( VG_(thread_stack_next)(&tid, &stack_min, &stack_max) ) { |
| if (stack_min - VG_STACK_REDZONE_SZB <= a && a <= stack_max) { |
| ai->tag = Addr_Stack; |
| ai->Addr.Stack.tid = tid; |
| return; |
| } |
| } |
| /* -- last ditch attempt at classification -- */ |
| tl_assert( sizeof(ai->Addr.SectKind.objname) > 4 ); |
| VG_(memset)( &ai->Addr.SectKind.objname, |
| 0, sizeof(ai->Addr.SectKind.objname)); |
| VG_(strcpy)( ai->Addr.SectKind.objname, "???" ); |
| sect = VG_(DebugInfo_sect_kind)( &ai->Addr.SectKind.objname[0], |
| sizeof(ai->Addr.SectKind.objname)-1, a); |
| if (sect != Vg_SectUnknown) { |
| ai->tag = Addr_SectKind; |
| ai->Addr.SectKind.kind = sect; |
| tl_assert( ai->Addr.SectKind.objname |
| [ sizeof(ai->Addr.SectKind.objname)-1 ] == 0); |
| return; |
| } |
| /* -- Clueless ... -- */ |
| ai->tag = Addr_Unknown; |
| return; |
| } |
| |
| void MC_(pp_describe_addr) ( Addr a ) |
| { |
| AddrInfo ai; |
| |
| ai.tag = Addr_Undescribed; |
| describe_addr (a, &ai); |
| mc_pp_AddrInfo (a, &ai, /* maybe_gcc */ False); |
| } |
| |
| /* Fill in *origin_ec as specified by otag, or NULL it out if otag |
| does not refer to a known origin. */ |
| static void update_origin ( /*OUT*/ExeContext** origin_ec, |
| UInt otag ) |
| { |
| UInt ecu = otag & ~3; |
| *origin_ec = NULL; |
| if (VG_(is_plausible_ECU)(ecu)) { |
| *origin_ec = VG_(get_ExeContext_from_ECU)( ecu ); |
| } |
| } |
| |
| /* Updates the copy with address info if necessary (but not for all errors). */ |
| UInt MC_(update_Error_extra)( Error* err ) |
| { |
| MC_Error* extra = VG_(get_error_extra)(err); |
| |
| switch (VG_(get_error_kind)(err)) { |
| // These ones don't have addresses associated with them, and so don't |
| // need any updating. |
| case Err_CoreMem: |
| //case Err_Value: |
| //case Err_Cond: |
| case Err_Overlap: |
| // For Err_Leaks the returned size does not matter -- they are always |
| // shown with VG_(unique_error)() so they 'extra' not copied. But |
| // we make it consistent with the others. |
| case Err_Leak: |
| return sizeof(MC_Error); |
| |
| // For value errors, get the ExeContext corresponding to the |
| // origin tag. Note that it is a kludge to assume that |
| // a length-1 trace indicates a stack origin. FIXME. |
| case Err_Value: |
| update_origin( &extra->Err.Value.origin_ec, |
| extra->Err.Value.otag ); |
| return sizeof(MC_Error); |
| case Err_Cond: |
| update_origin( &extra->Err.Cond.origin_ec, |
| extra->Err.Cond.otag ); |
| return sizeof(MC_Error); |
| case Err_RegParam: |
| update_origin( &extra->Err.RegParam.origin_ec, |
| extra->Err.RegParam.otag ); |
| return sizeof(MC_Error); |
| |
| // These ones always involve a memory address. |
| case Err_Addr: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.Addr.ai ); |
| return sizeof(MC_Error); |
| case Err_MemParam: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.MemParam.ai ); |
| update_origin( &extra->Err.MemParam.origin_ec, |
| extra->Err.MemParam.otag ); |
| return sizeof(MC_Error); |
| case Err_Jump: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.Jump.ai ); |
| return sizeof(MC_Error); |
| case Err_User: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.User.ai ); |
| update_origin( &extra->Err.User.origin_ec, |
| extra->Err.User.otag ); |
| return sizeof(MC_Error); |
| case Err_Free: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.Free.ai ); |
| return sizeof(MC_Error); |
| case Err_IllegalMempool: |
| describe_addr ( VG_(get_error_address)(err), |
| &extra->Err.IllegalMempool.ai ); |
| return sizeof(MC_Error); |
| |
| // Err_FreeMismatches have already had their address described; this is |
| // possible because we have the MC_Chunk on hand when the error is |
| // detected. However, the address may be part of a user block, and if so |
| // we override the pre-determined description with a user block one. |
| case Err_FreeMismatch: { |
| tl_assert(extra && Block_Mallocd == |
| extra->Err.FreeMismatch.ai.Addr.Block.block_kind); |
| (void)client_block_maybe_describe( VG_(get_error_address)(err), |
| &extra->Err.FreeMismatch.ai ); |
| return sizeof(MC_Error); |
| } |
| |
| default: VG_(tool_panic)("mc_update_extra: bad errkind"); |
| } |
| } |
| |
| |
| static Bool client_block_maybe_describe( Addr a, |
| /*OUT*/AddrInfo* ai ) |
| { |
| UWord i; |
| CGenBlock* cgbs = NULL; |
| UWord cgb_used = 0; |
| |
| MC_(get_ClientBlock_array)( &cgbs, &cgb_used ); |
| if (cgbs == NULL) |
| tl_assert(cgb_used == 0); |
| |
| /* Perhaps it's a general block ? */ |
| for (i = 0; i < cgb_used; i++) { |
| if (cgbs[i].start == 0 && cgbs[i].size == 0) |
| continue; |
| // Use zero as the redzone for client blocks. |
| if (VG_(addr_is_in_block)(a, cgbs[i].start, cgbs[i].size, 0)) { |
| ai->tag = Addr_Block; |
| ai->Addr.Block.block_kind = Block_UserG; |
| ai->Addr.Block.block_desc = cgbs[i].desc; |
| ai->Addr.Block.block_szB = cgbs[i].size; |
| ai->Addr.Block.rwoffset = (Word)(a) - (Word)(cgbs[i].start); |
| ai->Addr.Block.lastchange = cgbs[i].where; |
| return True; |
| } |
| } |
| return False; |
| } |
| |
| |
| static Bool mempool_block_maybe_describe( Addr a, |
| /*OUT*/AddrInfo* ai ) |
| { |
| MC_Mempool* mp; |
| tl_assert( MC_(mempool_list) ); |
| |
| VG_(HT_ResetIter)( MC_(mempool_list) ); |
| while ( (mp = VG_(HT_Next)(MC_(mempool_list))) ) { |
| if (mp->chunks != NULL) { |
| MC_Chunk* mc; |
| VG_(HT_ResetIter)(mp->chunks); |
| while ( (mc = VG_(HT_Next)(mp->chunks)) ) { |
| if (addr_is_in_MC_Chunk_with_REDZONE_SZB(mc, a, mp->rzB)) { |
| ai->tag = Addr_Block; |
| ai->Addr.Block.block_kind = Block_MempoolChunk; |
| ai->Addr.Block.block_desc = "block"; |
| ai->Addr.Block.block_szB = mc->szB; |
| ai->Addr.Block.rwoffset = (Word)a - (Word)mc->data; |
| ai->Addr.Block.lastchange = mc->where; |
| return True; |
| } |
| } |
| } |
| } |
| return False; |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Suppressions ---*/ |
| /*------------------------------------------------------------*/ |
| |
| typedef |
| enum { |
| ParamSupp, // Bad syscall params |
| UserSupp, // Errors arising from client-request checks |
| CoreMemSupp, // Memory errors in core (pthread ops, signal handling) |
| |
| // Undefined value errors of given size |
| Value1Supp, Value2Supp, Value4Supp, Value8Supp, Value16Supp, |
| |
| // Undefined value error in conditional. |
| CondSupp, |
| |
| // Unaddressable read/write attempt at given size |
| Addr1Supp, Addr2Supp, Addr4Supp, Addr8Supp, Addr16Supp, |
| |
| JumpSupp, // Jump to unaddressable target |
| FreeSupp, // Invalid or mismatching free |
| OverlapSupp, // Overlapping blocks in memcpy(), strcpy(), etc |
| LeakSupp, // Something to be suppressed in a leak check. |
| MempoolSupp, // Memory pool suppression. |
| } |
| MC_SuppKind; |
| |
| Bool MC_(is_recognised_suppression) ( Char* name, Supp* su ) |
| { |
| SuppKind skind; |
| |
| if (VG_STREQ(name, "Param")) skind = ParamSupp; |
| else if (VG_STREQ(name, "User")) skind = UserSupp; |
| else if (VG_STREQ(name, "CoreMem")) skind = CoreMemSupp; |
| else if (VG_STREQ(name, "Addr1")) skind = Addr1Supp; |
| else if (VG_STREQ(name, "Addr2")) skind = Addr2Supp; |
| else if (VG_STREQ(name, "Addr4")) skind = Addr4Supp; |
| else if (VG_STREQ(name, "Addr8")) skind = Addr8Supp; |
| else if (VG_STREQ(name, "Addr16")) skind = Addr16Supp; |
| else if (VG_STREQ(name, "Jump")) skind = JumpSupp; |
| else if (VG_STREQ(name, "Free")) skind = FreeSupp; |
| else if (VG_STREQ(name, "Leak")) skind = LeakSupp; |
| else if (VG_STREQ(name, "Overlap")) skind = OverlapSupp; |
| else if (VG_STREQ(name, "Mempool")) skind = MempoolSupp; |
| else if (VG_STREQ(name, "Cond")) skind = CondSupp; |
| else if (VG_STREQ(name, "Value0")) skind = CondSupp; /* backwards compat */ |
| else if (VG_STREQ(name, "Value1")) skind = Value1Supp; |
| else if (VG_STREQ(name, "Value2")) skind = Value2Supp; |
| else if (VG_STREQ(name, "Value4")) skind = Value4Supp; |
| else if (VG_STREQ(name, "Value8")) skind = Value8Supp; |
| else if (VG_STREQ(name, "Value16")) skind = Value16Supp; |
| else |
| return False; |
| |
| VG_(set_supp_kind)(su, skind); |
| return True; |
| } |
| |
| Bool MC_(read_extra_suppression_info) ( Int fd, Char** bufpp, |
| SizeT* nBufp, Supp *su ) |
| { |
| Bool eof; |
| |
| if (VG_(get_supp_kind)(su) == ParamSupp) { |
| eof = VG_(get_line) ( fd, bufpp, nBufp, NULL ); |
| if (eof) return False; |
| VG_(set_supp_string)(su, VG_(strdup)("mc.resi.1", *bufpp)); |
| } |
| return True; |
| } |
| |
| Bool MC_(error_matches_suppression) ( Error* err, Supp* su ) |
| { |
| Int su_szB; |
| MC_Error* extra = VG_(get_error_extra)(err); |
| ErrorKind ekind = VG_(get_error_kind )(err); |
| |
| switch (VG_(get_supp_kind)(su)) { |
| case ParamSupp: |
| return ((ekind == Err_RegParam || ekind == Err_MemParam) |
| && VG_STREQ(VG_(get_error_string)(err), |
| VG_(get_supp_string)(su))); |
| |
| case UserSupp: |
| return (ekind == Err_User); |
| |
| case CoreMemSupp: |
| return (ekind == Err_CoreMem |
| && VG_STREQ(VG_(get_error_string)(err), |
| VG_(get_supp_string)(su))); |
| |
| case Value1Supp: su_szB = 1; goto value_case; |
| case Value2Supp: su_szB = 2; goto value_case; |
| case Value4Supp: su_szB = 4; goto value_case; |
| case Value8Supp: su_szB = 8; goto value_case; |
| case Value16Supp:su_szB =16; goto value_case; |
| value_case: |
| return (ekind == Err_Value && extra->Err.Value.szB == su_szB); |
| |
| case CondSupp: |
| return (ekind == Err_Cond); |
| |
| case Addr1Supp: su_szB = 1; goto addr_case; |
| case Addr2Supp: su_szB = 2; goto addr_case; |
| case Addr4Supp: su_szB = 4; goto addr_case; |
| case Addr8Supp: su_szB = 8; goto addr_case; |
| case Addr16Supp:su_szB =16; goto addr_case; |
| addr_case: |
| return (ekind == Err_Addr && extra->Err.Addr.szB == su_szB); |
| |
| case JumpSupp: |
| return (ekind == Err_Jump); |
| |
| case FreeSupp: |
| return (ekind == Err_Free || ekind == Err_FreeMismatch); |
| |
| case OverlapSupp: |
| return (ekind == Err_Overlap); |
| |
| case LeakSupp: |
| return (ekind == Err_Leak); |
| |
| case MempoolSupp: |
| return (ekind == Err_IllegalMempool); |
| |
| default: |
| VG_(printf)("Error:\n" |
| " unknown suppression type %d\n", |
| VG_(get_supp_kind)(su)); |
| VG_(tool_panic)("unknown suppression type in " |
| "MC_(error_matches_suppression)"); |
| } |
| } |
| |
| Char* MC_(get_error_name) ( Error* err ) |
| { |
| switch (VG_(get_error_kind)(err)) { |
| case Err_RegParam: return "Param"; |
| case Err_MemParam: return "Param"; |
| case Err_User: return "User"; |
| case Err_FreeMismatch: return "Free"; |
| case Err_IllegalMempool: return "Mempool"; |
| case Err_Free: return "Free"; |
| case Err_Jump: return "Jump"; |
| case Err_CoreMem: return "CoreMem"; |
| case Err_Overlap: return "Overlap"; |
| case Err_Leak: return "Leak"; |
| case Err_Cond: return "Cond"; |
| case Err_Addr: { |
| MC_Error* extra = VG_(get_error_extra)(err); |
| switch ( extra->Err.Addr.szB ) { |
| case 1: return "Addr1"; |
| case 2: return "Addr2"; |
| case 4: return "Addr4"; |
| case 8: return "Addr8"; |
| case 16: return "Addr16"; |
| default: VG_(tool_panic)("unexpected size for Addr"); |
| } |
| } |
| case Err_Value: { |
| MC_Error* extra = VG_(get_error_extra)(err); |
| switch ( extra->Err.Value.szB ) { |
| case 1: return "Value1"; |
| case 2: return "Value2"; |
| case 4: return "Value4"; |
| case 8: return "Value8"; |
| case 16: return "Value16"; |
| default: VG_(tool_panic)("unexpected size for Value"); |
| } |
| } |
| default: VG_(tool_panic)("get_error_name: unexpected type"); |
| } |
| } |
| |
| Bool MC_(get_extra_suppression_info) ( Error* err, |
| /*OUT*/Char* buf, Int nBuf ) |
| { |
| ErrorKind ekind = VG_(get_error_kind )(err); |
| tl_assert(buf); |
| tl_assert(nBuf >= 16); // stay sane |
| if (Err_RegParam == ekind || Err_MemParam == ekind) { |
| Char* errstr = VG_(get_error_string)(err); |
| tl_assert(errstr); |
| VG_(snprintf)(buf, nBuf-1, "%s", errstr); |
| return True; |
| } else { |
| return False; |
| } |
| } |
| |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end mc_errors.c ---*/ |
| /*--------------------------------------------------------------------*/ |