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e938c02748
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Siddhesh Poyarekar e938c02748 Don't add access size hints to fortifiable functions 
In the context of a function definition, the size hints imply that the
size of an object pointed to by one parameter is another parameter.
This doesn't make sense for the fortified versions of the functions
since that's the bit it's trying to validate.

This is harmless with __builtin_object_size since it has fairly simple
semantics when it comes to objects passed as function parameters.
With __builtin_dynamic_object_size we could (as my patchset for gcc[1]
already does) use the access attribute to determine the object size in
the general case but it misleads the fortified functions.

Basically the problem occurs when access attributes are present on
regular functions that have inline fortified definitions to generate
_chk variants; the attributes get inherited by these definitions,
causing problems when analyzing them.  For example with poll(fds, nfds,
timeout), nfds is hinted using the __attr_access as being the size of
fds.

Now, when analyzing the inline function definition in bits/poll2.h, the
compiler sees that nfds is the size of fds and tries to use that
information in the function body.  In _FORTIFY_SOURCE=3 case, where the
object size could be a non-constant expression, this information results
in the conclusion that nfds is the size of fds, which defeats the
purpose of the implementation because we're trying to check here if nfds
does indeed represent the size of fds.  Hence for this case, it is best
to not have the access attribute.

With the attributes gone, the expression evaluation should get delayed
until the function is actually inlined into its destinations.

Disable the access attribute for fortified function inline functions
when building at _FORTIFY_SOURCE=3 to make this work better.  The
access attributes remain for the _chk variants since they can be used
by the compiler to warn when the caller is passing invalid arguments.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581125.html

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2021-10-20 08:33:31 +05:30
..
bits Don't add access size hints to fortifiable functions 2021-10-20 08:33:31 +05:30
sys Don't add access size hints to fortifiable functions 2021-10-20 08:33:31 +05:30
access.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-ftw1.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
bug-ftw2.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
bug-ftw3.c Update. 2002-02-07 17:54:45 +00:00
bug-ftw4.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
bug-ftw5.c [BZ #4076] 2007-02-21 09:36:46 +00:00
chdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
close.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
closefrom.c io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
copy_file_range.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
creat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
creat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup3.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dup.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
euidaccess.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
faccessat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchmodat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fchownat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fcntl.h Linux: Fix fcntl, ioctl, prctl redirects for _TIME_BITS=64 (bug 28182) 2021-08-06 09:52:00 +02:00
file_change_detection.c hurd: Fix build after 52a5fe70a2 2021-06-23 14:14:48 -03:00
flock.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstat64.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
fstat.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
fstatat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatvfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstatvfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts64-time64.c io: Add fts64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
fts64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fts.h io: Add fts64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftw64-time64.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
ftw64.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
ftw.c io: Fix ftw internal realloc buffer (BZ #28126) 2021-10-07 11:09:16 -03:00
ftw.h io: Add ftw64 with 64-bit time_t support 2021-06-15 10:42:11 -03:00
ftwtest-sh io: Use temporary directory and file for ftwtest-sh 2021-04-15 09:39:53 -03:00
ftwtest-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
ftwtest.c Update. 2003-11-07 23:00:00 +00:00
futimens.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getcwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getdirname.c Use 64 bit time_t stat internally 2021-06-22 12:09:52 -03:00
getwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
isatty.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lchown.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
link.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
linkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lockf64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lockf.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lseek64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lseek.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lstat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
lstat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile io: Fix ftw internal realloc buffer (BZ #28126) 2021-10-07 11:09:16 -03:00
mkdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkdirat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkfifo.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mkfifoat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mknod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mknodat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open64_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
open.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat64_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat_2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
openat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pipe2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pipe.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
poll.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
poll.h initial import 1995-02-18 01:27:10 +00:00
posix_fadvise64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fadvise.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fallocate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
posix_fallocate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ppoll.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
pwd.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
read.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
readlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
readlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rmdir.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sendfile64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sendfile.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stat64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statvfs64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statvfs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statx_generic.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
statx.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
symlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
symlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
test-lfs.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
test-stat2.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
test-stat.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
test-utime.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-closefrom.c Use support_open_dev_null_range io/tst-closefrom, misc/tst-close_range, and posix/tst-spawn5 (BZ #28260) 2021-08-26 17:13:47 -03:00
tst-copy_file_range.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-faccessat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fchmodat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fchownat.c Revert "hurd: Fix building io/tst-fchownat.c" 2018-01-28 19:13:20 +01:00
tst-fcntl-time64.c io: Add time64 alias for fcntl 2021-07-21 11:58:16 +02:00
tst-fcntl.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
tst-file_change_detection.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-fstatat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-fts-lfs.c Add LFS support for fts functions (bug 11460) 2015-11-06 11:24:16 +01:00
tst-fts-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-fts.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ftw-bz26353.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ftw-bz28126.c io: Fix ftw internal realloc buffer (BZ #28126) 2021-10-07 11:09:16 -03:00
tst-ftw-lnk.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-futimens-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimens.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimesat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-futimesat.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-getcwd-abspath.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-getcwd.c Remove "Contributed by" lines 2021-09-03 22:06:44 +05:30
tst-lchmod.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-linkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-lockf.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-lutimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-lutimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-mkdirat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-mkfifoat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-mknodat.c Assume that _DIRENT_HAVE_D_TYPE is always defined. 2017-10-30 15:48:33 +01:00
tst-open-tmpfile.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-openat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-posix_fallocate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-posix_fallocate-common.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-posix_fallocate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-readlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-renameat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-stat-lfs.c io: Return EBAFD for negative file descriptor on fstat (BZ #27559) 2021-03-11 10:51:55 -03:00
tst-stat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-stat.c io: Fix sporadic test failures in io/tst-stat 2021-06-10 13:48:26 +02:00
tst-statvfs.c Update. 2003-10-27 04:05:04 +00:00
tst-statx.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-symlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-ttyname_r.c * nis/nis_subr.c (nis_getnames): Revert last change. 2006-12-05 21:28:15 +00:00
tst-unlinkat.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-utime-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utime.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimensat-skeleton.c io: Do not skip timestamps tests for 32-bit time_t 2021-10-04 10:51:55 -03:00
tst-utimensat-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimensat.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimes-time64.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
tst-utimes.c y2038: Add test coverage 2021-06-15 10:42:11 -03:00
ttyname_r.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ttyname.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
umask.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unlink.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unlinkat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
utime.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
utime.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
utimensat.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Versions io: Add closefrom [BZ #10353] 2021-07-08 14:08:14 -03:00
write.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00