[asan] implement our own /proc/self/maps reader and use it on linux instead of sysinfo.h
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@147581 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 26a08ae..2a52916 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -13,12 +13,15 @@
//===----------------------------------------------------------------------===//
#ifdef __linux__
+#include "asan_interceptors.h"
#include "asan_internal.h"
+#include "asan_procmaps.h"
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <fcntl.h>
+#include <stdio.h>
#include <unistd.h>
extern char _DYNAMIC[];
@@ -96,6 +99,57 @@
return close(fd);
}
+AsanProcMaps::AsanProcMaps() {
+ proc_self_maps_buff_len_ =
+ ReadFileToBuffer("/proc/self/maps", &proc_self_maps_buff_,
+ &proc_self_maps_buff_mmaped_size_, 1 << 20);
+ CHECK(proc_self_maps_buff_len_ > 0);
+ // AsanWrite(2, proc_self_maps_buff_, proc_self_maps_buff_len_);
+ Reset();
+}
+
+AsanProcMaps::~AsanProcMaps() {
+ AsanUnmapOrDie(proc_self_maps_buff_, proc_self_maps_buff_mmaped_size_);
+}
+
+void AsanProcMaps::Reset() {
+ current_ = proc_self_maps_buff_;
+}
+
+bool AsanProcMaps::Next(uint64_t *start, uint64_t *end,
+ uint64_t *offset, char filename[],
+ size_t filename_size) {
+ char *last = proc_self_maps_buff_ + proc_self_maps_buff_len_;
+ if (current_ >= last) return false;
+ int consumed = 0;
+ char flags[10];
+ int major, minor;
+ uint64_t inode;
+ char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
+ if (next_line == NULL)
+ next_line = last;
+ if (SScanf(current_,
+ "%llx-%llx %4s %llx %x:%x %lld %n",
+ start, end, flags, offset, &major, &minor,
+ &inode, &consumed) != 7)
+ return false;
+ current_ += consumed;
+ // Skip spaces.
+ while (current_ < next_line && *current_ == ' ')
+ current_++;
+ // Fill in the filename.
+ size_t i = 0;
+ while (current_ < next_line) {
+ if (filename && i < filename_size - 1)
+ filename[i++] = *current_;
+ current_++;
+ }
+ if (filename && i < filename_size)
+ filename[i] = 0;
+ current_ = next_line + 1;
+ return true;
+}
+
} // namespace __asan
#endif // __linux__