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Add readlink() and readlinkat() checks

This commit is contained in:
sin 2015-02-28 16:48:58 +00:00
parent e02237241b
commit 958ead636c
1 changed files with 26 additions and 0 deletions
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26
include/unistd.h
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@ -95,6 +95,28 @@ __fortify_read(int fd, void *buf, size_t n)
return read(fd, buf, n);
}
static inline __attribute__ ((always_inline))
ssize_t
__fortify_readlink(const char *path, char *buf, size_t n)
{
size_t bos = __builtin_object_size(buf, 0);
if (n > bos)
__builtin_trap();
return readlink(path, buf, n);
}
static inline __attribute__ ((always_inline))
ssize_t
__fortify_readlinkat(int fd, const char *path, char *buf, size_t n)
{
size_t bos = __builtin_object_size(buf, 0);
if (n > bos)
__builtin_trap();
return readlinkat(fd, path, buf, n);
}
static inline __attribute__ ((always_inline))
int
__fortify_ttyname_r(int fd, char *name, size_t n)
@ -137,6 +159,10 @@ __fortify_write(int fd, const void *buf, size_t n)
#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
#undef read
#define read(fd, buf, n) __fortify_read(fd, buf, n)
#undef readlink
#define readlink(path, buf, n) __fortify_readlink(path, buf, n)
#undef readlinkat
#define readlinkat(fd, path, buf, n) __fortify_readlinkat(fd, path, buf, n)
#undef ttyname_r
#define ttyname_r(fd, name, n) __fortify_ttyname_r(fd, name, n)
#undef write