This patch enables the option to influence hwcaps used by PowerPC.
The environment variable, GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,-zzz....,
can be used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature xxx
and zzz, where the feature name is case-sensitive and has to match the ones
mentioned in the file{sysdeps/powerpc/dl-procinfo.c}.
Note that the hwcap tunables only used in the IFUNC selection.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Avoid potential stack overflow from unbounded alloca. Use the existing
scratch_buffer instead.
Add testcases to exercise the code as suggested by Adhemerval Zanella Netto.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On GCC before 11, IPA can make the fortified realpath aware that the
buffer size is not large enough (8 bytes instead of PATH_MAX bytes).
Fix this by using a buffer that is large enough.
When building with fortify enabled, GCC 6 issues an warning the fortify
wrapper might overflow the destination buffer. However, GCC does not
provide a specific flag to disable the warning (the failure is tied to
-Werror). So to avoid disable all errors, only enable the check for
GCC 7 or newer.
Checked on i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
On __convert_scm_timestamps GCC 6 issues an warning that tvts[0]/tvts[1]
maybe be used uninitialized, however it would be used if type is set to a
value different than 0 (done by either COMPAT_SO_TIMESTAMP_OLD or
COMPAT_SO_TIMESTAMPNS_OLD) which will fallthrough to 'common' label.
It does not show with gcc 7 or more recent versions.
Checked on i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Similar to memcpy, mempcpy, and memmove there is no need for an
specific memset_chk-nonshared.S. It can be provided by
memset-ia32.S itself for static library.
Checked on i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The i386 string routines provide multiple internal definitions
for memcpy, memmove, and mempcpy chk routines:
$ objdump -t libc.a | grep __memcpy_chk
00000000 g F .text 0000000e __memcpy_chk
00000000 g F .text 00000013 __memcpy_chk
$ objdump -t libc.a | grep __mempcpy_chk
00000000 g F .text 0000000e __mempcpy_chk
00000000 g F .text 00000013 __mempcpy_chk
$ objdump -t libc.a | grep __memmove_chk
00000000 g F .text 0000000e __memmove_chk
00000000 g F .text 00000013 __memmove_chk
Although is not an issue for normal static builds, with fortify=3
glibc itself might use the fortify chk functions and thus static
build might fail with multiple definitions. For instance:
x86_64-glibc-linux-gnu-gcc -m32 -march=i686 -o [...]math/test-signgam-uchar-static -nostdlib -nostartfiles -static -static-pie [...]
x86_64-glibc-linux-gnu/bin/ld: [...]/libc.a(mempcpy-ia32.o):
in function `__mempcpy_chk': [...]/glibc-git/string/../sysdeps/i386/i686/mempcpy.S:32: multiple definition of `__mempcpy_chk';
[...]/libc.a(mempcpy_chk-nonshared.o):[...]/debug/../sysdeps/i386/mempcpy_chk.S:28: first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [../Rules:298:
There is no need for mem*-nonshared.S, the __mem*_chk routines
are already provided by the assembly routines.
Checked on i686-linux-gnu with gcc 13 built with fortify=1,2,3 and
without fortify.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
With gcc 11.3.1, building with -D_FORTIFY_SOURCE=2 shows:
In function ‘getgroups’,
inlined from ‘do_test’ at test-errno.c:129:12:
../misc/sys/cdefs.h:195:6: error: argument 1 value -1 is negative
[-Werror=stringop-overflow=]
195 | ? __ ## f ## _alias (__VA_ARGS__)
\
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../posix/bits/unistd.h:115:10: note: in expansion of macro
‘__glibc_fortify’
115 | return __glibc_fortify (getgroups, __size, sizeof (__gid_t),
| ^~~~~~~~~~~~~~~
../posix/bits/unistd.h: In function ‘do_test’:
../posix/bits/unistd-decl.h:135:28: note: in a call to function
‘__getgroups_alias’ declared with attribute ‘access (write_only, 2, 1)’
135 | extern int __REDIRECT_NTH (__getgroups_alias, (int __size,
__gid_t __list[]),
| ^~~~~~~~~~~~~~~~~
../misc/sys/cdefs.h:264:6: note: in definition of macro ‘__REDIRECT_NTH’
264 | name proto __asm__ (__ASMNAME (#alias)) __THROW
It builds fine with gcc 12 and gcc 13.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The compiler might not see that internal definition is an alias
due the libc_ifunc macro, which redefines __strchrnul. With
gcc 6 it fails with:
In file included from <command-line>:0:0:
./../include/libc-symbols.h:472:33: error: ‘__EI___strchrnul’ aliased to
undefined symbol ‘__GI___strchrnul’
extern thread __typeof (name) __EI_##name \
^
./../include/libc-symbols.h:468:3: note: in expansion of macro
‘__hidden_ver2’
__hidden_ver2 (, local, internal, name)
^~~~~~~~~~~~~
./../include/libc-symbols.h:476:29: note: in expansion of macro
‘__hidden_ver1’
# define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
^~~~~~~~~~~~~
./../include/libc-symbols.h:557:32: note: in expansion of macro
‘hidden_def’
# define libc_hidden_def(name) hidden_def (name)
^~~~~~~~~~
../sysdeps/powerpc/powerpc64/multiarch/strchrnul.c:38:1: note: in
expansion of macro ‘libc_hidden_def’
libc_hidden_def (__strchrnul)
^~~~~~~~~~~~~~~
Use libc_ifunc_hidden as stpcpy. Checked on powerpc64 with
gcc 6 and gcc 13.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Old GCC might trigger the the comparison will always evaluate as ‘true’
warnig for static build:
set-freeres.c:87:14: error: the comparison will always evaluate as
‘true’ for the address of ‘__libc_getgrgid_freemem_ptr’ will never be
NULL [-Werror=address]
if (&__ptr != NULL) \
So add pragma weak for all affected usages.
Checked on x86_64 and i686 with gcc 6 and 13.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Generated on a Cavium Octeon III 2 board running Linux version 4.19.249
and GCC 13.1.0.
Needed due to commit cf7ffdd8a5 ("added pair of inputs for hypotf in
binary32").
This was added in 233399bce2 just for warn_if_unused
warnings rather than anything substantial.
Now that we have a proper configure argument for F_S (--enable-fortify-source),
just drop this entirely, to avoid conflicting with e.g. detected --enable-fortify-source
finding F_S=3, then nscd's Makefile setting F_S=2, resulting in a build-failure
because of the redefinition.
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Reviewed-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Starting with commit 2c6b4b272e
"nptl: Unconditionally use a 32-byte rseq area", the testcase
misc/tst-rseq-disable is UNSUPPORTED as RSEQ_SIG is not defined.
The mentioned commit removes inclusion of sys/rseq.h in nptl/descr.h.
Thus just include sys/rseq.h in the tst-rseq-disable.c as also done
in tst-rseq.c and tst-rseq-nptl.c.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
If fortify is enabled, the truncated output warning is issued by
the wrapper itself:
In function ‘strncpy’,
inlined from ‘test_strncpy’ at tester.c:505:10:
../string/bits/string_fortified.h:95:10: error: ‘__builtin_strncpy’
destination unchanged after copying no bytes from a string of length 3
[-Werror=stringop-truncation]
95 | return __builtin___strncpy_chk (__dest, __src, __len,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
96 | __glibc_objsize (__dest));
| ~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../include/bits/string_fortified.h:1,
from ../string/string.h:548,
from ../include/string.h:60,
from tester.c:33,
from inl-tester.c:6:
In function ‘strncpy’,
inlined from ‘test_strncpy’ at tester.c:505:10:
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
If fortify is enabled, the truncated output warning is issued by
the wrapper itself:
bug-strncat1.c: In function ‘main’:
bug-strncat1.c:14:3: error: ‘__builtin___strncat_chk’ output truncated
copying 1 byte from a string of length 2 [-Werror=stringop-truncation]
14 | strncat (d, "\5\6", 1);
| ^
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The errno variable is potentially clobbered by the preceding
send call. It is not related to the to-be-cached information.
The parallel code in hstcache.c and servicescache.c already uses
errval.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Leads to build failures (preprocessor redefinitions), and there is not
enough time to address this properly. Deferred until after 2.38 release.
This reverts commit 59dc07637f.
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Generated on a VisionFive 2 board running Linux version 6.4.2 and
GCC 13.1.0.
Needed due to commit cf7ffdd8a5 ("added pair of inputs for hypotf in
binary32").
Add new definitions for the MIPS target, specifically: relocation
types, machine flags, section type names, and object attribute tags
and values. On MIPS64, up to three relocations may be specified
within r_info, by the r_type, r_type2, and r_type3 fields, so add new
macros to get the respective reloc types for MIPS64.
If the kernel headers provide a larger struct rseq, we used that
size as the argument to the rseq system call. As a result,
rseq registration would fail on older kernels which only accept
size 32.
On GNU/Hurd, O_RDWR actually is O_WRONLY|O_RDONLY, so checking through
bitness really is wrong. O_ACCMODE is there for this.
Fixes: 5324d25842 ("fileops: Don't process ,ccs= as individual mode flags (BZ#18906)")
The 30379efad1 added _FORTIFY_SOURCE checks without check if compiler
does support all used fortify levels. This patch fixes it by first
checking at configure time the maximum support fortify level and using
it instead of a pre-defined one.
Checked on x86_64 with gcc 11, 12, and 13.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Tested-by: Florian Weimer <fweimer@redhat.com>
We mentioned eventual dropping of libcrypt in the 2.28 NEWS. Actually
put that plan in motion by first disabling building libcrypt by default.
note in NEWS that the library will be dropped completely in a future
release.
Also add a couple of builds into build-many-glibcs.py.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Fixes the following test-time errors, that lead to FAILs, on toolchains
that set -z now out o the box, such as the one used on Gentoo Hardened:
.../build-x86-x86_64-pc-linux-gnu-nptl $ grep '' nptl/tst-tls3*.out
nptl/tst-tls3.out:dlopen failed
nptl/tst-tls3-malloc.out:dlopen failed
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
* nptl/descr.h (struct pthread): Remove end_padding member, which
made this type incomplete.
(PTHREAD_STRUCT_END_PADDING): Stop using end_padding.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
The _FORTIFY_SOURCE is used as default by some system compilers,
and there is no way to check if some fortify extension does not
trigger any conformance issue.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Based on feedback by Mike Gilbert <floppym@gentoo.org>
Linux-6.1.38-dist x86_64 AMD Phenom-tm- II X6 1055T Processor
-march=amdfam10
failures occur for x32 ABI
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Starting with commit 1bcfe0f732, the
test was enhanced and the object for __builtin_return_address (0)
is searched with _dl_find_object.
Unfortunately on e.g. s390 (31bit), a postprocessing step is needed
as the highest bit has to be masked out. This can be done with
__builtin_extract_return_addr.
Without this postprocessing, _dl_find_object returns with -1 and the
content of dlfo is invalid, which may lead to segfaults in basename.
Therefore those checks are now only done on success.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
On some machines we end up with incomplete cache information. This can
make the new calculation of `sizeof(total-L3)/custom-divisor` end up
lower than intended (and lower than the prior value). So reintroduce
the old bound as a lower bound to avoid potentially regressing code
where we don't have complete information to make the decision.
Reviewed-by: DJ Delorie <dj@redhat.com>
After:
```
commit af992e7abd
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Wed Jun 7 13:18:01 2023 -0500
x86: Increase `non_temporal_threshold` to roughly `sizeof_L3 / 4`
```
Split `shared` (cumulative cache size) from `shared_per_thread` (cache
size per socket), the `shared_per_thread` *can* be slightly off from
the previous calculation.
Previously we added `core` even if `threads_l2` was invalid, and only
used `threads_l2` to divide `core` if it was present. The changed
version only included `core` if `threads_l2` was valid.
This change restores the old behavior if `threads_l2` is invalid by
adding the entire value of `core`.
Reviewed-by: DJ Delorie <dj@redhat.com>
Based on feedback by Arsen Arsenović <arsen@gentoo.org>
Linux-6.1.38-gentoo-dist-hardened x86_64 AMD Ryzen 7 3800X 8-Core Processor
-march=x86-64-v2
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Line numbers, version numbers, template date changed everywhere
Nontrivial changes in de, ro, uk, zh_TW
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
