For AMD Zen3+ architecture, the performance of the vectorized loop is
slightly better than ERMS.
Checked on x86_64-linux-gnu on Zen3.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
The REP MOVSB usage on memcpy/memmove does not show much performance
improvement on Zen3/Zen4 cores compared to the vectorized loops. Also,
as from BZ 30994, if the source is aligned and the destination is not
the performance can be 20x slower.
The performance difference is noticeable with small buffer sizes, closer
to the lower bounds limits when memcpy/memmove starts to use ERMS. The
performance of REP MOVSB is similar to vectorized instruction on the
size limit (the L2 cache). Also, there is no drawback to multiple cores
sharing the cache.
Checked on x86_64-linux-gnu on Zen3.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Some shadow stack test scripts use the '==' operator with the 'test'
command to validate exit codes resulting in the following error:
sysdeps/x86_64/tst-shstk-legacy-1e.sh: 31: test: 139: unexpected operator
The '==' operator is invalid for the 'test' command, use '-eq' like the
previous call to 'test'.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Change "\(" and "\)" to "\\(" and "\\)" in test_printers_common.py. This
fixes the test warning:
.../scripts/test_printers_common.py:101: SyntaxWarning: invalid escape sequence '\('
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Linux 6.7 adds a constant SOL_VSOCK (recall that various constants in
include/linux/socket.h are in fact part of the kernel-userspace API
despite that not being a uapi header). Add it to glibc's
bits/socket.h.
Tested for x86_64.
Otherwise on at least x86_64 and s390x there is an unwanted PLT entry
in libc.so when configured with --enable-fortify-source=3 and build
with -Os.
This is observed in elf/check-localplt
Extra PLT reference: libc.so: __strcpy_chk
The call to PLT entry is in inet/ruserpass.c.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
The commit 49d877a80b (arm: Remove
_dl_skip_args usage) removed the _SKIP_ARGS literal, which was
previously loader to r4 on loader _start. However, the cleanup did not
remove the following 'ldr r4, [sl, r4]' on _dl_start_user, used to check
to skip the arguments after ld self-relocations.
In my testing, the kernel initially set r4 to 0, which makes the
ldr instruction just read the _GLOBAL_OFFSET_TABLE_. However, since r4
is a callee-saved register; a different runtime might not zero
initialize it and thus trigger an invalid memory access.
Checked on arm-linux-gnu.
Reported-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
On LoongArch GCC compiles __builtin_ffs{,ll} to basically
`(x ? __builtin_ctz (x) : -1) + 1`. Since a hardware ctz instruction is
available, this is much better than the table-driven generic
implementation.
Tested on loongarch64.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On s390x, I get warnings like this when do_one_test is inlined with SIZE_MAX:
In function ‘do_one_test’,
inlined from ‘do_overflow_tests’ at tst-strlcat2.c:184:2:
tst-strlcat2.c:49:18: error: ‘strnlen’ specified bound [18446744073709550866, 18446744073709551615] exceeds maximum object size 9223372036854775807 [-Werror=stringop-overflow=]
49 | # define STRNLEN strnlen
| ^
tst-strlcat2.c:89:23: note: in expansion of macro ‘STRNLEN’
89 | size_t dst_length = STRNLEN (dst, n);
| ^~~~~~~
This patch just marks the do_one_test function as noinline as also done in test-strncat.c:
Fix stringop-overflow warning in test-strncat.
https://sourceware.org/git/?p=glibc.git;a=commit;h=51aeab9a363a0d000d0912aa3d6490463a26fba2
For o32 we need to setup a minimal stack frame to allow cprestore
on __thread_start_clone3 (which instruct the linker to save the
gp for PIC). Also, there is no guarantee by kABI that $8 will be
preserved after syscall execution, so we need to save it on the
provided stack.
Checked on mipsel-linux-gnu.
Reported-by: Khem Raj <raj.khem@gmail.com>
Tested-by: Khem Raj <raj.khem@gmail.com>
* manual/search.texi (Comparison Functions, Array Sort Function):
Sort an array of long ints, not doubles, to avoid hassles
with NaNs.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Complete the internal renaming from "C2X" and related names in GCC by
renaming *-c2x and *-gnu2x tests to *-c23 and *-gnu23.
Tested for x86_64, and with build-many-glibcs.py for powerpc64le.
My recent change broke make pdf and in other documentation formats
results in weird rendering and invalid URL, all because of a forgotten
comma to separate @uref arguments.
When running the testsuite in parallel, for instance running make -j
$(nproc) check, occasionally tst-epoll fails with a timeout. It happens
because it sometimes takes a bit more than 10ms for the process to get
cloned and blocked by the syscall. In that case the signal is
sent to early, and the test fails with a timeout.
Checked on x86_64-linux-gnu.
The exp10, exp10l, fma, fmaf, and fmal default implementation do not
implement the appropriate semantics nor with an reasonable accuracy.
They are also not used by any supported port.
WG14 decided to use the name C23 as the informal name of the next
revision of the C standard (notwithstanding the publication date in
2024). Update references to C2X in glibc to use the C23 name.
This is intended to update everything *except* where it involves
renaming files (the changes involving renaming tests are intended to
be done separately). In the case of the _ISOC2X_SOURCE feature test
macro - the only user-visible interface involved - support for that
macro is kept for backwards compatibility, while adding
_ISOC23_SOURCE.
Tested for x86_64.
A version string may contain non-digit characters, commonly found in
built-from-VCS tools, e.g.
```
git version 2.39.GIT
git version 2.43.0.493.gbc7ee2e5e1
```
`int()` will raise a ValueError, leading to a spurious 'missing'.
Reviewed-by: DJ Delorie <dj@redhat.com>
The following patch uses the GCC 14 __builtin_stdc_* builtins in stdbit.h
for the type-generic macros, so that when compiled with GCC 14 or later,
it supports not just 8/16/32/64-bit unsigned integers, but also 128-bit
(if target supports them) and unsigned _BitInt (any supported precision).
And so that the macros don't expand arguments multiple times and can be
evaluated in constant expressions.
The new testcase is gcc's gcc/testsuite/gcc.dg/builtin-stdc-bit-1.c
adjusted to test stdbit.h and the type-generic macros in there instead
of the builtins and adjusted to use glibc test framework rather than
gcc style tests with __builtin_abort ().
Signed-off-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Joseph Myers <josmyers@redhat.com>
Starting with commits
- 7ea510127e
string: Add libc_hidden_proto for strchrnul
- 22999b2f0f
string: Add libc_hidden_proto for memrchr
building glibc on s390x with --disable-multi-arch fails if only
the C-variant of strchrnul / memrchr is used. This is the case
if gcc uses -march < z13.
The build fails with:
../sysdeps/s390/strchrnul-c.c:28:49: error: ‘__strchrnul_c’ undeclared here (not in a function); did you mean ‘__strchrnul’?
28 | __hidden_ver1 (__strchrnul_c, __GI___strchrnul, __strchrnul_c);
With --disable-multi-arch, __strchrnul_c is not available as string/strchrnul.c
is just included without defining STRCHRNUL and thus we also don't have to create
the internal hidden symbol.
Tested-by: Andreas K. Hüttel <dilfridge@gentoo.org>
Simplify the advisory format by dropping the -Backport tags and instead
stick to using just the -Commit tags. To identify backports, put a
substring of git-describe into the release version in the brackets next
to the commit ref. This way, it not only identifies that the fix (or
regression) is on the release/2.YY/master branch, it also disambiguates
regressions/fixes in the branch from those in the tarball.
Add a README to make it easier for consumers to understand the format.
Additionally, the Release wiki needs to be updated to inform the release
manager to:
1. Generate a NEWS snipped from the advisories directory
AND
2. on release/2.YY/master, replace the advisories directory with a text
file pointing to the advisories directory in master so that we don't
have to update multiple locations.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Andreas K. Hüttel <dilfridge@gentoo.org>
__vsyslog_internal calculated a buffer size by adding two integers, but
did not first check if the addition would overflow. This commit fixes
that.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
__vsyslog_internal used the return value of snprintf/vsnprintf to
calculate buffer sizes for memory allocation. If these functions (for
any reason) failed and returned -1, the resulting buffer would be too
small to hold output. This commit fixes that.
All snprintf/vsnprintf calls are checked for negative return values and
the function silently returns upon encountering them.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
__vsyslog_internal did not handle a case where printing a SYSLOG_HEADER
containing a long program name failed to update the required buffer
size, leading to the allocation and overflow of a too-small buffer on
the heap. This commit fixes that. It also adds a new regression test
that uses glibc.malloc.check.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This change relicenses the IBM portions of resolv/base64.c and
resolv/res_debug.c to a new license that does not have use-limited
patent language. The top-level LICENSE file is updated with the
license.
The relicensing was approved by IBM.
Signed-off-by: Brad Topol, IBM Director of Open Technologies <btopol@us.ibm.com>
Signed-off-by: Richard Fontana <rfontana@redhat.com>
Signed-off-by: Carlos O'Donell <carlos@redhat.com>
On the summary page the order of the function arguments was reversed, but it is
in correct order in the other places of the manual.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The increased malloc subsystem usage is a side effect of
commit d2123d6827 ("elf: Fix slow tls
access after dlopen [BZ #19924]").
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
