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Add pread() and pwrite() checks

This commit is contained in:
sin 2015-01-30 09:44:49 +00:00
parent 03289c3954
commit 03886aa26c
1 changed files with 34 additions and 0 deletions
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34
include/unistd.h
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@ -8,6 +8,36 @@
#define __errordecl(name, msg) extern void name(void) __attribute__((__error__(msg)))
__errordecl(__pread_error, "pread: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
__fortify_pread(int fd, void *buf, size_t n, off_t offset)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(n) && n > bos)
__pread_error();
if (n > bos)
__builtin_trap();
return pread(fd, buf, n, offset);
}
__errordecl(__pwrite_error, "pwrite: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
__fortify_pwrite(int fd, void *buf, size_t n, off_t offset)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(n) && n > bos)
__pwrite_error();
if (n > bos)
__builtin_trap();
return pwrite(fd, buf, n, offset);
}
__errordecl(__read_error, "read: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
@ -38,6 +68,10 @@ __fortify_write(int fd, void *buf, size_t n)
return write(fd, buf, n);
}
#undef pread
#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
#undef pwrite
#define pwrite(fd, buf, n, offset) __fortify_pwrite(fd, buf, n, offset)
#undef read
#define read(fd, buf, n) __fortify_read(fd, buf, n)
#undef write