These functions are about to be added to POSIX, under Austin Group
issue 986.
The fortified strlcat implementation does not raise SIGABRT if the
destination buffer does not contain a null terminator, it just
inherits the non-failing regular strlcat behavior.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
With fortification enabled, fgets calls return result needs to be checked,
has it gets the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
With fortification enabled, fread calls return result needs to be checked,
has it gets the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
The tst-mallocfork2 and tst-mallocfork3 create large number of
subprocesss, around 11k for former and 20k for latter, to check
for malloc async-signal-safeness on both fork and _Fork. However
they do not really exercise allocation patterns different than
other tests fro malloc itself, and the spawned process just exit
without any extra computation.
The tst-malloc-tcache-leak is similar, but creates 100k threads
and already checks the resulting with mallinfo.
These tests are also very sensitive to system load (since they
estresss heavy the kernel resource allocation), and adding them
on THP tunable and mcheck tests increase the pressure even more.
For THP the fork tests do not add any more coverage than other
tests. The mcheck is also not enable for tst-malloc-tcache-leak.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
There is no fork detection on current arc4random implementation, so
use lower subprocess on fork tests. The tests now run on 0.1s
instead of 8s on a Ryzen9 5900X.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The getdate testcases all expect successful results. Add support for
negative testcases and testcases where a full date and time are not
supplied by skipping the tm checks in the test. Add a testcase that
would catch a use-after-free that was recently found.
Reviewed-by: Arjun Shankar <arjun@redhat.com>
Different systems prefer a different divisors.
From benchmarks[1] so far the following divisors have been found:
ICX : 2
SKX : 2
BWD : 8
For Intel, we are generalizing that BWD and older prefers 8 as a
divisor, and SKL and newer prefers 2. This number can be further tuned
as benchmarks are run.
[1]: https://github.com/goldsteinn/memcpy-nt-benchmarks
Reviewed-by: DJ Delorie <dj@redhat.com>
This patch should have no affect on existing functionality.
The current code, which has a single switch for model detection and
setting prefered features, is difficult to follow/extend. The cases
use magic numbers and many microarchitectures are missing. This makes
it difficult to reason about what is implemented so far and/or
how/where to add support for new features.
This patch splits the model detection and preference setting stages so
that CPU preferences can be set based on a complete list of available
microarchitectures, rather than based on model magic numbers.
Reviewed-by: DJ Delorie <dj@redhat.com>
Current `non_temporal_threshold` set to roughly '3/4 * sizeof_L3 /
ncores_per_socket'. This patch updates that value to roughly
'sizeof_L3 / 4`
The original value (specifically dividing the `ncores_per_socket`) was
done to limit the amount of other threads' data a `memcpy`/`memset`
could evict.
Dividing by 'ncores_per_socket', however leads to exceedingly low
non-temporal thresholds and leads to using non-temporal stores in
cases where REP MOVSB is multiple times faster.
Furthermore, non-temporal stores are written directly to main memory
so using it at a size much smaller than L3 can place soon to be
accessed data much further away than it otherwise could be. As well,
modern machines are able to detect streaming patterns (especially if
REP MOVSB is used) and provide LRU hints to the memory subsystem. This
in affect caps the total amount of eviction at 1/cache_associativity,
far below meaningfully thrashing the entire cache.
As best I can tell, the benchmarks that lead this small threshold
where done comparing non-temporal stores versus standard cacheable
stores. A better comparison (linked below) is to be REP MOVSB which,
on the measure systems, is nearly 2x faster than non-temporal stores
at the low-end of the previous threshold, and within 10% for over
100MB copies (well past even the current threshold). In cases with a
low number of threads competing for bandwidth, REP MOVSB is ~2x faster
up to `sizeof_L3`.
The divisor of `4` is a somewhat arbitrary value. From benchmarks it
seems Skylake and Icelake both prefer a divisor of `2`, but older CPUs
such as Broadwell prefer something closer to `8`. This patch is meant
to be followed up by another one to make the divisor cpu-specific, but
in the meantime (and for easier backporting), this patch settles on
`4` as a middle-ground.
Benchmarks comparing non-temporal stores, REP MOVSB, and cacheable
stores where done using:
https://github.com/goldsteinn/memcpy-nt-benchmarks
Sheets results (also available in pdf on the github):
https://docs.google.com/spreadsheets/d/e/2PACX-1vS183r0rW_jRX6tG_E90m9qVuFiMbRIJvi5VAE8yYOvEOIEEc3aSNuEsrFbuXw5c3nGboxMmrupZD7K/pubhtml
Reviewed-by: DJ Delorie <dj@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
tst-getdate used to rely on an in-tree datemsk file that was
subsequently replaced by a file created during test execution. This
commit removes the unused file and corresponding env-var and uses a more
appropriate name for the temp file.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
getdate would free the buffer pointed to by the result of its call to
strptime, then reference the same buffer later on -- leading to a
use-after-free. This commit fixes that.
Reported-by: Martin Coufal <mcoufal@redhat.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Since these functions are used in both catgets/gencat.c and
malloc/memusage{,stat}.c, it make sense to move them into a dedicated
header where they can be inlined.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
With fortification enabled, few function calls return result need to be
checked, has they get the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
When enabling _FORTIFY_SOURCE, some functions now lead to warnings when
their result is not checked.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Container management default seccomp filter [1] only accepts
clock_settime if process has also CAP_SYS_TIME. So also handle
EPERM as well.
Also adapt the test to libsupport and add a proper Copyright header.
Checked on aarch64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Container management default seccomp filter [1] only accepts
personality(2) with PER_LINUX, (0x0), UNAME26 (0x20000),
PER_LINUX32 (0x8), UNAME26 | PER_LINUX32, and 0xffffffff (to query
current personality)
Although the documentation only state it is blocked to prevent
'enabling BSD emulation' (PER_BSD, not implemented by Linux), checking
on repository log the real reason is to block ASLR disable flag
(ADDR_NO_RANDOMIZE) and other poorly support emulations.
So handle EPERM and fail as UNSUPPORTED if we can really check for
BZ#19408.
Checked on aarch64-linux-gnu.
[1] https://github.com/moby/moby/blob/master/profiles/seccomp/default.json
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Since the area of the user's stack we use for the registers dump (and
otherwise as __sigreturn2's stack) can and does overlap the sigcontext,
we have to be very careful about the order of loads and stores that we
do. In particular we have to load sc_reply_port before we start
clobbering the sigcontext.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
We add a 'make check' test that lints all Makefiles in the source
directory of the glibc build. This linting test ensures that the
lines in all Makefiles will be sorted correctly as developers
creates patches. It is added to 'make check' because it is
light-weight and supports the existing developer workflow
The test adds ~3s to a 'make check' execution.
No regressions on x86_64 and i686.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Sort Makefile variables using scrips/sort-makefile-lines.py.
No code generation changes observed in non-test binary artifacts.
No regressions on x86_64 and i686.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
epoll_pwait2(2)'s second argument should be nonnull. We're going to add
__nonnull to the prototype, so let's fix the test accordingly. We can
use a dummy variable to avoid passing NULL.
Reported-by: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
With fortification enabled, few function calls return result need to be
checked, has they get the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
With fortification enabled, ftruncate calls return result needs to be
checked, has it gets the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Since the assembly source file with -evex suffix should use YMM registers,
not ZMM registers, include x86-evex256-vecs.h by default to use YMM
registers in memcmpeq-evex.S
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
In some cases (e.g. when podman creates user containers), the only other
group assigned to the executing user is nobody and fchown fails with it
because the group is not mapped. Do not fail the test in this case,
instead exit as unsupported.
Reported-by: Frédéric Bérat <fberat@redhat.com>
Tested-by: Frédéric Bérat <fberat@redhat.com>
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Different than other 64 bit architectures, powerpc64 defines the
LFS POSIX lock constants with values similar to 32 ABI, which
are meant to be used with fcntl64 syscall. Since powerpc64 kABI
does not have fcntl, the constants are adjusted with the
FCNTL_ADJUST_CMD macro.
The 4d0fe291ae changed the logic of generic constants
LFS value are equal to the default values; which is now wrong
for powerpc64.
Fix the value by explicit define the previous glibc constants
(powerpc64 does not need to use the 32 kABI value, but it simplifies
the FCNTL_ADJUST_CMD which should be kept as compatibility).
Checked on powerpc64-linux-gnu and powerpc-linux-gnu.
For architecture with default 64 bit time_t support, the kernel
does not provide LFS and non-LFS values for F_GETLK, F_GETLK, and
F_GETLK (the default value used for 64 bit architecture are used).
This is might be considered an ABI break, but the currenct exported
values is bogus anyway.
The POSIX lockf is not affected since it is aliased to lockf64,
which already uses the LFS values.
Checked on i686-linux-gnu and the new tests on a riscv32.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Previously, after destructors for a DSO have been invoked, ld.so refused
to bind against that DSO in all cases. Relax this restriction somewhat
if the referencing object is itself a DSO that is being unloaded. This
assumes that the symbol reference is not going to be stored anywhere.
The situation in the test case can arise fairly easily with C++ and
objects that are built with different optimization levels and therefore
define different functions with vague linkage.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The LoongArch glibc was using the value of the SHMLBA macro from common code,
which is __getpagesize() (16k), but this was inconsistent with the value of
the SHMLBA macro in the kernel, which is SZ_64K (64k). This caused several
shmat-related tests in LTP (Linux Test Project) to fail. This commit fixes
the issue by ensuring that the glibc's SHMLBA macro value matches the value
used in the kernel like other architectures.
Applying this commit results in bit-identical libc.so.6.
The elf/ld-linux-x86-64.so.2 does change, but only in .note.gnu.build-id
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
