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Add confstr() checks

This commit is contained in:
sin 2015-02-05 14:03:53 +00:00
parent 6e4f53a3f5
commit aa19847d12
1 changed files with 17 additions and 0 deletions
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17
include/unistd.h
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@ -8,6 +8,21 @@
#define __errordecl(name, msg) extern void name(void) __attribute__ ((__error__(msg)))
__errordecl(__confstr_error, "confstr: buffer overflow detected");
static inline __attribute__ ((always_inline))
size_t
__fortify_confstr(int name, char *buf, size_t len)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(len) && len > bos)
__confstr_error();
if (len > bos)
__builtin_trap();
return confstr(name, buf, len);
}
__errordecl(__pread_error, "pread: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
@ -38,6 +53,8 @@ __fortify_read(int fd, void *buf, size_t n)
return read(fd, buf, n);
}
#undef confstr
#define confstr(name, buf, len) __fortify_confstr(name, buf, len)
#undef pread
#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
#undef read