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Add gethostname() checks

This commit is contained in:
sin 2015-02-23 10:45:20 +00:00
parent c1734bf206
commit 9a77136c59
1 changed files with 17 additions and 0 deletions
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17
include/unistd.h
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@ -37,6 +37,21 @@ __fortify_getcwd(char *buf, size_t len)
return getcwd(buf, len);
}
__errordecl(__gethostname_error, "gethostname: buffer overflow detected");
static inline __attribute__ ((always_inline))
int
__fortify_gethostname(char *name, size_t len)
{
size_t bos = __builtin_object_size(name, 0);
if (__builtin_constant_p(len) && len > bos)
__gethostname_error();
if (len > bos)
__builtin_trap();
return gethostname(name, len);
}
__errordecl(__pread_error, "pread: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
@ -71,6 +86,8 @@ __fortify_read(int fd, void *buf, size_t n)
#define confstr(name, buf, len) __fortify_confstr(name, buf, len)
#undef getcwd
#define getcwd(buf, len) __fortify_getcwd(buf, len)
#undef gethostname
#define gethostname(name, len) __fortify_gethostname(name, len)
#undef pread
#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
#undef read