Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/ia32/ia32_signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 7 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes |
| 8 | * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
| 16 | #include <linux/wait.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/unistd.h> |
| 18 | #include <linux/stddef.h> |
| 19 | #include <linux/personality.h> |
| 20 | #include <linux/compat.h> |
Andi Kleen | 9fbbd4d | 2007-02-13 13:26:26 +0100 | [diff] [blame] | 21 | #include <linux/binfmts.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/ucontext.h> |
| 23 | #include <asm/uaccess.h> |
Ingo Molnar | 78f7f1e | 2015-04-24 02:54:44 +0200 | [diff] [blame] | 24 | #include <asm/fpu/internal.h> |
Ingo Molnar | fcbc99c | 2015-04-30 08:45:02 +0200 | [diff] [blame] | 25 | #include <asm/fpu/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/ptrace.h> |
| 27 | #include <asm/ia32_unistd.h> |
| 28 | #include <asm/user32.h> |
Ingo Molnar | decb4c4 | 2015-09-05 09:32:43 +0200 | [diff] [blame] | 29 | #include <uapi/asm/sigcontext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/proto.h> |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 31 | #include <asm/vdso.h> |
Hiroshi Shimamoto | d98f9d8 | 2008-12-17 18:52:45 -0800 | [diff] [blame] | 32 | #include <asm/sigframe.h> |
H. Peter Anvin | f28f0c2 | 2012-02-19 07:38:43 -0800 | [diff] [blame] | 33 | #include <asm/sighandling.h> |
Jaswinder Singh Rajput | 2f06de0 | 2008-12-27 21:37:10 +0530 | [diff] [blame] | 34 | #include <asm/sys_ia32.h> |
H. Peter Anvin | 49b8c69 | 2012-09-21 17:18:44 -0700 | [diff] [blame] | 35 | #include <asm/smap.h> |
Hiroshi Shimamoto | d98f9d8 | 2008-12-17 18:52:45 -0800 | [diff] [blame] | 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* |
| 38 | * Do a signal return; undo the signal stack. |
| 39 | */ |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 40 | #define loadsegment_gs(v) load_gs_index(v) |
| 41 | #define loadsegment_fs(v) loadsegment(fs, v) |
| 42 | #define loadsegment_ds(v) loadsegment(ds, v) |
| 43 | #define loadsegment_es(v) loadsegment(es, v) |
| 44 | |
| 45 | #define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; }) |
| 46 | #define set_user_seg(seg, v) loadsegment_##seg(v) |
| 47 | |
Hiroshi Shimamoto | b78a5b5 | 2008-11-17 15:44:50 -0800 | [diff] [blame] | 48 | #define COPY(x) { \ |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 49 | get_user_ex(regs->x, &sc->x); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
Hiroshi Shimamoto | 8801ead | 2009-02-20 19:00:13 -0800 | [diff] [blame] | 52 | #define GET_SEG(seg) ({ \ |
| 53 | unsigned short tmp; \ |
| 54 | get_user_ex(tmp, &sc->seg); \ |
| 55 | tmp; \ |
| 56 | }) |
| 57 | |
| 58 | #define COPY_SEG_CPL3(seg) do { \ |
| 59 | regs->seg = GET_SEG(seg) | 3; \ |
| 60 | } while (0) |
Hiroshi Shimamoto | d71a68d | 2008-11-17 15:47:06 -0800 | [diff] [blame] | 61 | |
Hiroshi Shimamoto | 8c6e5ce | 2008-11-17 15:47:48 -0800 | [diff] [blame] | 62 | #define RELOAD_SEG(seg) { \ |
Peter Zijlstra | de90525 | 2019-02-25 12:56:35 +0100 | [diff] [blame] | 63 | unsigned int pre = (seg) | 3; \ |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 64 | unsigned int cur = get_user_seg(seg); \ |
Hiroshi Shimamoto | 8c6e5ce | 2008-11-17 15:47:48 -0800 | [diff] [blame] | 65 | if (pre != cur) \ |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 66 | set_user_seg(seg, pre); \ |
Hiroshi Shimamoto | 8c6e5ce | 2008-11-17 15:47:48 -0800 | [diff] [blame] | 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 69 | static int ia32_restore_sigcontext(struct pt_regs *regs, |
Ingo Molnar | 8fcb346 | 2015-09-05 09:32:41 +0200 | [diff] [blame] | 70 | struct sigcontext_32 __user *sc) |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 71 | { |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 72 | unsigned int tmpflags, err = 0; |
Peter Zijlstra | de90525 | 2019-02-25 12:56:35 +0100 | [diff] [blame] | 73 | u16 gs, fs, es, ds; |
Suresh Siddha | ab51370 | 2008-07-29 10:29:22 -0700 | [diff] [blame] | 74 | void __user *buf; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 75 | u32 tmp; |
| 76 | |
| 77 | /* Always make any pending restarted system calls return -EINTR */ |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 78 | current->restart_block.fn = do_no_restart_syscall; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 79 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 80 | get_user_try { |
Peter Zijlstra | de90525 | 2019-02-25 12:56:35 +0100 | [diff] [blame] | 81 | gs = GET_SEG(gs); |
| 82 | fs = GET_SEG(fs); |
| 83 | ds = GET_SEG(ds); |
| 84 | es = GET_SEG(es); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 86 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
Brian Gerst | 6a3713f | 2015-04-04 08:58:23 -0400 | [diff] [blame] | 87 | COPY(dx); COPY(cx); COPY(ip); COPY(ax); |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 88 | /* Don't touch extended registers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 90 | COPY_SEG_CPL3(cs); |
| 91 | COPY_SEG_CPL3(ss); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 93 | get_user_ex(tmpflags, &sc->flags); |
| 94 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); |
| 95 | /* disable syscall checks */ |
| 96 | regs->orig_ax = -1; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 97 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 98 | get_user_ex(tmp, &sc->fpstate); |
| 99 | buf = compat_ptr(tmp); |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 100 | } get_user_catch(err); |
| 101 | |
Peter Zijlstra | de90525 | 2019-02-25 12:56:35 +0100 | [diff] [blame] | 102 | /* |
| 103 | * Reload fs and gs if they have changed in the signal |
| 104 | * handler. This does not handle long fs/gs base changes in |
| 105 | * the handler, but does not clobber them at least in the |
| 106 | * normal case. |
| 107 | */ |
| 108 | RELOAD_SEG(gs); |
| 109 | RELOAD_SEG(fs); |
| 110 | RELOAD_SEG(ds); |
| 111 | RELOAD_SEG(es); |
| 112 | |
Ingo Molnar | 9dfe99b | 2015-04-29 20:55:19 +0200 | [diff] [blame] | 113 | err |= fpu__restore_sig(buf, 1); |
H. Peter Anvin | 5e88353 | 2012-09-21 12:43:15 -0700 | [diff] [blame] | 114 | |
Brian Gerst | 1daeaa3 | 2015-03-21 18:54:21 -0400 | [diff] [blame] | 115 | force_iret(); |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
| 119 | |
Al Viro | 3fe26fa | 2012-11-12 14:32:42 -0500 | [diff] [blame] | 120 | asmlinkage long sys32_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Al Viro | 3fe26fa | 2012-11-12 14:32:42 -0500 | [diff] [blame] | 122 | struct pt_regs *regs = current_pt_regs(); |
Hiroshi Shimamoto | 3b0d29e | 2008-12-17 18:51:46 -0800 | [diff] [blame] | 123 | struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | sigset_t set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 127 | goto badframe; |
| 128 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 129 | || (_COMPAT_NSIG_WORDS > 1 |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 130 | && __copy_from_user((((char *) &set.sig) + 4), |
| 131 | &frame->extramask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | sizeof(frame->extramask)))) |
| 133 | goto badframe; |
| 134 | |
Oleg Nesterov | 905f29e | 2011-07-10 21:27:24 +0200 | [diff] [blame] | 135 | set_current_blocked(&set); |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 136 | |
Brian Gerst | 6a3713f | 2015-04-04 08:58:23 -0400 | [diff] [blame] | 137 | if (ia32_restore_sigcontext(regs, &frame->sc)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | goto badframe; |
Brian Gerst | 6a3713f | 2015-04-04 08:58:23 -0400 | [diff] [blame] | 139 | return regs->ax; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | badframe: |
| 142 | signal_fault(regs, frame, "32bit sigreturn"); |
| 143 | return 0; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Al Viro | 3fe26fa | 2012-11-12 14:32:42 -0500 | [diff] [blame] | 146 | asmlinkage long sys32_rt_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
Al Viro | 3fe26fa | 2012-11-12 14:32:42 -0500 | [diff] [blame] | 148 | struct pt_regs *regs = current_pt_regs(); |
Hiroshi Shimamoto | 3b0d29e | 2008-12-17 18:51:46 -0800 | [diff] [blame] | 149 | struct rt_sigframe_ia32 __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | sigset_t set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Hiroshi Shimamoto | 3b0d29e | 2008-12-17 18:51:46 -0800 | [diff] [blame] | 152 | frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 155 | goto badframe; |
| 156 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 157 | goto badframe; |
| 158 | |
Oleg Nesterov | 905f29e | 2011-07-10 21:27:24 +0200 | [diff] [blame] | 159 | set_current_blocked(&set); |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 160 | |
Brian Gerst | 6a3713f | 2015-04-04 08:58:23 -0400 | [diff] [blame] | 161 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | goto badframe; |
| 163 | |
Al Viro | 9026843 | 2012-12-14 14:47:53 -0500 | [diff] [blame] | 164 | if (compat_restore_altstack(&frame->uc.uc_stack)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | goto badframe; |
| 166 | |
Brian Gerst | 6a3713f | 2015-04-04 08:58:23 -0400 | [diff] [blame] | 167 | return regs->ax; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | badframe: |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 170 | signal_fault(regs, frame, "32bit rt sigreturn"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | return 0; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 172 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* |
| 175 | * Set up a signal frame. |
| 176 | */ |
| 177 | |
Ingo Molnar | 8fcb346 | 2015-09-05 09:32:41 +0200 | [diff] [blame] | 178 | static int ia32_setup_sigcontext(struct sigcontext_32 __user *sc, |
Suresh Siddha | ab51370 | 2008-07-29 10:29:22 -0700 | [diff] [blame] | 179 | void __user *fpstate, |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 180 | struct pt_regs *regs, unsigned int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 182 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 184 | put_user_try { |
Hiroshi Shimamoto | a967bb3 | 2009-02-20 19:00:54 -0800 | [diff] [blame] | 185 | put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs); |
| 186 | put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs); |
| 187 | put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds); |
| 188 | put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 190 | put_user_ex(regs->di, &sc->di); |
| 191 | put_user_ex(regs->si, &sc->si); |
| 192 | put_user_ex(regs->bp, &sc->bp); |
| 193 | put_user_ex(regs->sp, &sc->sp); |
| 194 | put_user_ex(regs->bx, &sc->bx); |
| 195 | put_user_ex(regs->dx, &sc->dx); |
| 196 | put_user_ex(regs->cx, &sc->cx); |
| 197 | put_user_ex(regs->ax, &sc->ax); |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 198 | put_user_ex(current->thread.trap_nr, &sc->trapno); |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 199 | put_user_ex(current->thread.error_code, &sc->err); |
| 200 | put_user_ex(regs->ip, &sc->ip); |
| 201 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); |
| 202 | put_user_ex(regs->flags, &sc->flags); |
| 203 | put_user_ex(regs->sp, &sc->sp_at_signal); |
| 204 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 206 | put_user_ex(ptr_to_compat(fpstate), &sc->fpstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 208 | /* non-iBCS2 extensions.. */ |
| 209 | put_user_ex(mask, &sc->oldmask); |
| 210 | put_user_ex(current->thread.cr2, &sc->cr2); |
| 211 | } put_user_catch(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | return err; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Determine which stack to use.. |
| 218 | */ |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 219 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
Suresh Siddha | 3c1c7f1 | 2008-07-29 10:29:21 -0700 | [diff] [blame] | 220 | size_t frame_size, |
Mathias Krause | 0ff8fef | 2012-09-02 23:31:42 +0200 | [diff] [blame] | 221 | void __user **fpstate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
Ingo Molnar | c5bedc6 | 2015-04-23 12:49:20 +0200 | [diff] [blame] | 223 | struct fpu *fpu = ¤t->thread.fpu; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 224 | unsigned long sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | /* Default to using normal stack */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 227 | sp = regs->sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
| 229 | /* This is the X/Open sanctioned signal stack switching. */ |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 230 | if (ksig->ka.sa.sa_flags & SA_ONSTACK) |
| 231 | sp = sigsp(sp, ksig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* This is the legacy signal stack switching. */ |
Hiroshi Shimamoto | 8bee3f0 | 2008-12-16 14:04:43 -0800 | [diff] [blame] | 233 | else if ((regs->ss & 0xffff) != __USER32_DS && |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 234 | !(ksig->ka.sa.sa_flags & SA_RESTORER) && |
| 235 | ksig->ka.sa.sa_restorer) |
| 236 | sp = (unsigned long) ksig->ka.sa.sa_restorer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Ingo Molnar | c5bedc6 | 2015-04-23 12:49:20 +0200 | [diff] [blame] | 238 | if (fpu->fpstate_active) { |
Suresh Siddha | 72a671c | 2012-07-24 16:05:29 -0700 | [diff] [blame] | 239 | unsigned long fx_aligned, math_size; |
| 240 | |
Ingo Molnar | 82c0e45 | 2015-04-29 21:09:18 +0200 | [diff] [blame] | 241 | sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size); |
Ingo Molnar | 86e9fc3 | 2015-09-05 09:32:36 +0200 | [diff] [blame] | 242 | *fpstate = (struct _fpstate_32 __user *) sp; |
Ingo Molnar | c8e1404 | 2015-04-28 11:35:20 +0200 | [diff] [blame] | 243 | if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned, |
Suresh Siddha | 72a671c | 2012-07-24 16:05:29 -0700 | [diff] [blame] | 244 | math_size) < 0) |
Hiroshi Shimamoto | 99ea1b93 | 2008-11-05 18:32:54 -0800 | [diff] [blame] | 245 | return (void __user *) -1L; |
Suresh Siddha | 3c1c7f1 | 2008-07-29 10:29:21 -0700 | [diff] [blame] | 246 | } |
| 247 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 248 | sp -= frame_size; |
Markus F.X.J. Oberhumer | d347f37 | 2005-10-09 18:54:23 +0200 | [diff] [blame] | 249 | /* Align the stack pointer according to the i386 ABI, |
| 250 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 251 | sp = ((sp + 4) & -16ul) - 4; |
| 252 | return (void __user *) sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 255 | int ia32_setup_frame(int sig, struct ksignal *ksig, |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 256 | compat_sigset_t *set, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
Hiroshi Shimamoto | 3b0d29e | 2008-12-17 18:51:46 -0800 | [diff] [blame] | 258 | struct sigframe_ia32 __user *frame; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 259 | void __user *restorer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | int err = 0; |
Suresh Siddha | ab51370 | 2008-07-29 10:29:22 -0700 | [diff] [blame] | 261 | void __user *fpstate = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 263 | /* copy_to_user optimizes that into a single 8 byte store */ |
| 264 | static const struct { |
| 265 | u16 poplmovl; |
| 266 | u32 val; |
| 267 | u16 int80; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 268 | } __attribute__((packed)) code = { |
| 269 | 0xb858, /* popl %eax ; movl $...,%eax */ |
| 270 | __NR_ia32_sigreturn, |
| 271 | 0x80cd, /* int $0x80 */ |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 272 | }; |
| 273 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 274 | frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 277 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Hiroshi Shimamoto | 2ba48e1 | 2008-09-12 17:02:53 -0700 | [diff] [blame] | 279 | if (__put_user(sig, &frame->sig)) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 280 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Hiroshi Shimamoto | 2ba48e1 | 2008-09-12 17:02:53 -0700 | [diff] [blame] | 282 | if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 283 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | if (_COMPAT_NSIG_WORDS > 1) { |
Hiroshi Shimamoto | 2ba48e1 | 2008-09-12 17:02:53 -0700 | [diff] [blame] | 286 | if (__copy_to_user(frame->extramask, &set->sig[1], |
| 287 | sizeof(frame->extramask))) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 288 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 291 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
| 292 | restorer = ksig->ka.sa.sa_restorer; |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 293 | } else { |
| 294 | /* Return stub is in 32bit vsyscall page */ |
Roland McGrath | 1a3e4ca | 2008-04-09 01:29:27 -0700 | [diff] [blame] | 295 | if (current->mm->context.vdso) |
Andy Lutomirski | 6f121e5 | 2014-05-05 12:19:34 -0700 | [diff] [blame] | 296 | restorer = current->mm->context.vdso + |
Andy Lutomirski | 0a6d1fa | 2015-10-05 17:47:56 -0700 | [diff] [blame] | 297 | vdso_image_32.sym___kernel_sigreturn; |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 298 | else |
Jan Engelhardt | ade1af7 | 2008-01-30 13:33:23 +0100 | [diff] [blame] | 299 | restorer = &frame->retcode; |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 300 | } |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 301 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 302 | put_user_try { |
| 303 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); |
| 304 | |
| 305 | /* |
| 306 | * These are actually not used anymore, but left because some |
| 307 | * gdb versions depend on them as a marker. |
| 308 | */ |
Mathias Krause | 0ff8fef | 2012-09-02 23:31:42 +0200 | [diff] [blame] | 309 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 310 | } put_user_catch(err); |
| 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | if (err) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 313 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | /* Set up registers for signal handler */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 316 | regs->sp = (unsigned long) frame; |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 317 | regs->ip = (unsigned long) ksig->ka.sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Andi Kleen | 536e3ee | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 319 | /* Make -mregparm=3 work */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 320 | regs->ax = sig; |
| 321 | regs->dx = 0; |
| 322 | regs->cx = 0; |
Andi Kleen | 536e3ee | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 323 | |
Jeremy Fitzhardinge | b6edbb1 | 2008-08-19 13:04:19 -0700 | [diff] [blame] | 324 | loadsegment(ds, __USER32_DS); |
| 325 | loadsegment(es, __USER32_DS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 327 | regs->cs = __USER32_CS; |
| 328 | regs->ss = __USER32_DS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 330 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 333 | int ia32_setup_rt_frame(int sig, struct ksignal *ksig, |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 334 | compat_sigset_t *set, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Hiroshi Shimamoto | 3b0d29e | 2008-12-17 18:51:46 -0800 | [diff] [blame] | 336 | struct rt_sigframe_ia32 __user *frame; |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 337 | void __user *restorer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | int err = 0; |
Suresh Siddha | ab51370 | 2008-07-29 10:29:22 -0700 | [diff] [blame] | 339 | void __user *fpstate = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 341 | /* __copy_to_user optimizes that into a single 8 byte store */ |
| 342 | static const struct { |
| 343 | u8 movl; |
| 344 | u32 val; |
| 345 | u16 int80; |
Hiroshi Shimamoto | 9cc3c49 | 2008-11-11 19:11:39 -0800 | [diff] [blame] | 346 | u8 pad; |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 347 | } __attribute__((packed)) code = { |
| 348 | 0xb8, |
| 349 | __NR_ia32_rt_sigreturn, |
| 350 | 0x80cd, |
| 351 | 0, |
| 352 | }; |
| 353 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 354 | frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
| 356 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 357 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 359 | put_user_try { |
| 360 | put_user_ex(sig, &frame->sig); |
| 361 | put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo); |
| 362 | put_user_ex(ptr_to_compat(&frame->uc), &frame->puc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 364 | /* Create the ucontext. */ |
Borislav Petkov | d366bf7 | 2016-04-04 22:25:02 +0200 | [diff] [blame] | 365 | if (boot_cpu_has(X86_FEATURE_XSAVE)) |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 366 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); |
| 367 | else |
| 368 | put_user_ex(0, &frame->uc.uc_flags); |
| 369 | put_user_ex(0, &frame->uc.uc_link); |
Al Viro | bd1c149a | 2013-09-01 20:35:01 +0100 | [diff] [blame] | 370 | compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 372 | if (ksig->ka.sa.sa_flags & SA_RESTORER) |
| 373 | restorer = ksig->ka.sa.sa_restorer; |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 374 | else |
Andy Lutomirski | 6f121e5 | 2014-05-05 12:19:34 -0700 | [diff] [blame] | 375 | restorer = current->mm->context.vdso + |
Andy Lutomirski | 0a6d1fa | 2015-10-05 17:47:56 -0700 | [diff] [blame] | 376 | vdso_image_32.sym___kernel_rt_sigreturn; |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 377 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 379 | /* |
| 380 | * Not actually used anymore, but left because some gdb |
| 381 | * versions need it. |
| 382 | */ |
Mathias Krause | 0ff8fef | 2012-09-02 23:31:42 +0200 | [diff] [blame] | 383 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
Hiroshi Shimamoto | 3b4b757 | 2009-01-23 15:50:38 -0800 | [diff] [blame] | 384 | } put_user_catch(err); |
| 385 | |
Dmitry Safonov | 6846351 | 2016-09-05 16:33:08 +0300 | [diff] [blame] | 386 | err |= __copy_siginfo_to_user32(&frame->info, &ksig->info, false); |
H. Peter Anvin | 5e88353 | 2012-09-21 12:43:15 -0700 | [diff] [blame] | 387 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, |
| 388 | regs, set->sig[0]); |
| 389 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | if (err) |
Hiroshi Shimamoto | 3d0aedd | 2008-09-12 17:01:09 -0700 | [diff] [blame] | 392 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* Set up registers for signal handler */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 395 | regs->sp = (unsigned long) frame; |
Al Viro | 235b802 | 2012-11-09 23:51:47 -0500 | [diff] [blame] | 396 | regs->ip = (unsigned long) ksig->ka.sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Albert Cahalan | a7aacdf | 2006-10-29 22:26:17 -0500 | [diff] [blame] | 398 | /* Make -mregparm=3 work */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 399 | regs->ax = sig; |
| 400 | regs->dx = (unsigned long) &frame->info; |
| 401 | regs->cx = (unsigned long) &frame->uc; |
Albert Cahalan | a7aacdf | 2006-10-29 22:26:17 -0500 | [diff] [blame] | 402 | |
Jeremy Fitzhardinge | b6edbb1 | 2008-08-19 13:04:19 -0700 | [diff] [blame] | 403 | loadsegment(ds, __USER32_DS); |
| 404 | loadsegment(es, __USER32_DS); |
Thomas Gleixner | 99b9cdf | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 405 | |
| 406 | regs->cs = __USER32_CS; |
| 407 | regs->ss = __USER32_DS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 409 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |