The functions were previously written in C, but were not compiled
with unwind information. The ENTRY/END macros includes .cfi_startproc
and .cfi_endproc which adds unwind information. This caused the
tests cleanup-8 and cleanup-10 in the GCC testsuite to fail.
This patch adds a version of the ENTRY/END macros without the
CFI instructions that can be used instead.
sigaction registers a restorer address that is located two instructions
before the stub function. This patch adds a two instruction padding to
avoid that the unwinder accesses the unwind information from the function
that the linker has placed right before it in memory. This fixes an issue
with pthread_cancel that caused tst-mutex8-static (and other tests) to fail.
Signed-off-by: Daniel Cederman <cederman@gaisler.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On LEON, if the stfsr instruction is immediately following a floating-point
operation instruction in a running program, with no other instruction in
between the two, the stfsr might behave as if the order was reversed
between the two instructions and the stfsr occurred before the
floating-point operation.
Add a nop instruction before the stfsr to prevent this from happening.
Signed-off-by: Daniel Cederman <cederman@gaisler.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Macros for using inline assembly to access the fp state register exists
in both fenv_private.h and in fpu_control.h. Let fenv_private.h use the
macros from fpu_control.h
Signed-off-by: Daniel Cederman <cederman@gaisler.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This patch updates the kernel version in the tests tst-mman-consts.py,
tst-mount-consts.py and tst-pidfd-consts.py to 6.7. (There are no new
constants covered by these tests in 6.7 that need any other header
changes.)
Tested with build-many-glibcs.py.
Linux 6.7 adds the futex_requeue, futex_wait and futex_wake syscalls,
and enables map_shadow_stack for architectures previously missing it.
Update syscall-names.list and regenerate the arch-syscall.h headers
with build-many-glibcs.py update-syscalls.
Tested with build-many-glibcs.py.
Adjust the testing approach to start from scenarios with only 2
elements, as insertion sort no longer handles such cases.
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
When malloc fails to allocate a buffer and falls back to heapsort, the
current heapsort implementation does not perform sorting when there are
exactly two elements. Heapsort is now skipped only when there is
exactly one element.
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Resolves: BZ # 31239
The correct abbreviated month names were apparently given in the comment above `abmon`.
But the value of `abmon` was apparently just copied from the value of `mon` and this
mistake was hard to see because code point notation <Uxxxx> was used. After converting
to UTF-8 it was obvious that there was apparently a copy and paste mistake.
The mergesort removal from qsort implementation (commit 03bf8357e8)
had the side-effect of making sorting nonstable. Although neither
POSIX nor C standard specify that qsort should be stable, it seems
that it has become an instance of Hyrum's law where multiple programs
expect it.
Also, the resulting introsort implementation is not faster than
the previous mergesort (which makes the change even less appealing).
This patch restores the previous mergesort implementation, with the
exception of machinery that checks the resulting allocation against
the _SC_PHYS_PAGES (it only adds complexity and the heuristic not
always make sense depending on the system configuration and load).
The alloca usage was replaced with a fixed-size buffer.
For the fallback mechanism, the implementation uses heapsort. It is
simpler than quicksort, and it does not suffer from adversarial
inputs. With memory overcommit, it should be rarely triggered.
The drawback is mergesort requires O(n) extra space, and since it is
allocated with malloc the function is AS-signal-unsafe. It should be
feasible to change it to use mmap, although I am not sure how urgent
it is. The heapsort is also nonstable, so programs that require a
stable sort would still be subject to this latent issue.
The tst-qsort5 is removed since it will not create quicksort adversarial
inputs with the current qsort_r implementation.
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Systemd execution environment configuration may prohibit changing a memory
mapping to become executable:
MemoryDenyWriteExecute=
Takes a boolean argument. If set, attempts to create memory mappings
that are writable and executable at the same time, or to change existing
memory mappings to become executable, or mapping shared memory segments
as executable, are prohibited.
When it is set, systemd service stops working if PLT rewrite is enabled.
Check if mprotect works before rewriting PLT. This fixes BZ #31230.
This also works with SELinux when deny_execmem is on.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Ffsll function randomly regress by ~20%, depending on how code gets
aligned in memory. Ffsll function code size is 17 bytes. Since default
function alignment is 16 bytes, it can load on 16, 32, 48 or 64 bytes
aligned memory. When ffsll function load at 16, 32 or 64 bytes aligned
memory, entire code fits in single 64 bytes cache line. When ffsll
function load at 48 bytes aligned memory, it splits in two cache line,
hence random regression.
Ffsll function size reduction from 17 bytes to 12 bytes ensures that it
will always fit in single 64 bytes cache line.
This patch fixes ffsll function random performance regression.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This patch referents the commit 374cef3 to add static-pie support. And
because the dummy link map is used when relocating ourselves, so need
not to set __global_pointer$ at this time.
It will also check whether toolchain supports to build static-pie.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
The 551101e824 change is incorrect for
alpha and sparc, since __NR_stat is defined by both kABI. Use
__NR_newfstat to check whether to fallback to __NR_fstat64 (similar
to what fstatat64 does).
Checked on sparc64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Remove the error handling wrapper from exp10. This is very similar to
the changes done to exp and exp2, except that we also need to handle
pow10 and pow10l.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Increase benchmark iterations for math and vector math functions to improve
timing accuracy. Vector math benchmarks now take 1-3 seconds on a modern CPU.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Otherwise the warning message for the getwd symbol ends up being duplicated.
Signed-off-by: Frederic Cambus <fred@statdns.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
The __getrandom_nocancel function returns errors as negative values
instead of errno. This is inconsistent with other _nocancel functions
and it breaks "TEMP_FAILURE_RETRY (__getrandom_nocancel (p, n, 0))" in
__arc4random_buf. Use INLINE_SYSCALL_CALL instead of
INTERNAL_SYSCALL_CALL to fix this issue.
But __getrandom_nocancel has been avoiding from touching errno for a
reason, see BZ 29624. So add a __getrandom_nocancel_nostatus function
and use it in tcache_key_initialize.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
CET feature bits in TCB, which are Linux specific, are used to check if
CET features are active. Move CET feature check to Linux/x86 directory.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Starting with commit 40c0add7d4
"resolve: Remove __res_context_query alloca usage"
there is an endless loop in __res_context_query if
__res_context_mkquery fails e.g. if type is invalid. Then the
scratch buffer is resized to MAXPACKET size and it is retried again.
Before the mentioned commit, it was retried only once and with the
mentioned commit, there is no check and it retries in an endless loop.
This is observable with xtest resolv/tst-resolv-qtypes which times out
after 300s.
This patch retries mkquery only once as before the mentioned commit.
Furthermore, scratch_buffer_set_array_size is now only called with
nelem=2 if type is T_QUERY_A_AND_AAAA (also see mentioned commit).
The test tst-resolv-qtypes is also adjusted to verify that <func>
is really returning with -1 in case of an invalid type.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
After 78ca44da01
("elf: Relocate libc.so early during startup and dlmopen (bug 31083)")
we start seeing tst-nodeps2 failures when building the testsuite with
--enable-hard-coded-path-in-tests.
When building the testsuite with --enable-hard-coded-path-in-tests
the tst-nodeps2-mod.so is not built with the required DT_RUNPATH
values and the test escapes the test framework and loads the system
libraries and aborts. The fix is to use the existing
$(link-test-modules-rpath-link) variable to set DT_RUNPATH correctly.
No regressions on x86_64.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
1. Remove _dl_runtime_resolve_shstk and _dl_runtime_profile_shstk.
2. Move CET offsets from x86 cpu-features-offsets.sym to x86-64
features-offsets.sym.
3. Rename x86 cet-control.h to x86-64 feature-control.h since it is only
for x86-64 and also used for PLT rewrite.
4. Add x86-64 ldsodefs.h to include feature-control.h.
5. Change TUNABLE_CALLBACK (set_plt_rewrite) to x86-64 only.
6. Move x86 dl-procruntime.c to x86-64.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Move sysdeps/x86/libc-start.h to sysdeps/x86_64/libc-start.h and use
sysdeps/generic/libc-start.h for i386.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Running build-many-glibcs.py with Python 3.12 or later produces a
warning:
build-many-glibcs.py:566: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
build_time = datetime.datetime.utcnow()
Replace with datetime.datetime.now(datetime.timezone.utc) (the
datetime.UTC constant is new in 3.11, so not suitable for use in this
script at present).
Running build-many-glibcs.py with Python 3.12 or later produces a
warning:
build-many-glibcs.py:173: SyntaxWarning: invalid escape sequence '\.'
m = re.fullmatch('([0-9]+)\.([0-9]+)[.0-9]*', l)
Use a raw string instead to avoid that warning. (Note: I haven't
checked whether any other Python scripts included with glibc might
have issues with newer Python versions.)
The feupdateenv tests added by 802aef27b2 do not restore the floating
point mask, which might keep some floating point exception enabled and
thus make the feupdateenv_single_test raise an unexpected signal.
Checked on x86_64-linux-gnu and aarch64-linux-gnu (on Apple M1 trapping
is supported).
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
On x86-64 machine with
[hjl@gnu-cfl-3 x86-glibc]$ ls -l /usr/include/asm/prctl.h sysdeps/unix/sysv/linux/x86_64/include/asm/prctl.h
-rw-r--r-- 1 hjl hjl 825 Jan 9 09:41 sysdeps/unix/sysv/linux/x86_64/include/asm/prctl.h
-rw-r--r-- 1 root root 1170 Nov 27 16:00 /usr/include/asm/prctl.h
[hjl@gnu-cfl-3 x86-glibc]$
glibc configured with --enable-cet build failed:
make[2]: Entering directory '/export/gnu/import/git/gitlab/x86-glibc/iconv'
../Makerules:327: update target
'/export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/gnu/lib-names-64.h'
due to: /export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/gnu/lib-names-64.stmp
:
../Makeconfig:1216: update target
'/export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/libc-modules.h'
due to: /export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/libc-modules.stmp
:
../Makerules:1126: update target '/usr/include/asm/prctl.h' due to:
../sysdeps/unix/sysv/linux/x86_64/64/../include/asm/prctl.h
force-install
/usr/bin/install -c -m 644
../sysdeps/unix/sysv/linux/x86_64/64/../include/asm/prctl.h
/usr/include/asm/prctl.h
/usr/bin/install: cannot remove '/usr/include/asm/prctl.h': Permission denied
make[2]: *** [../Makerules:1126: /usr/include/asm/prctl.h] Error 1
make[2]: Leaving directory '/export/gnu/import/git/gitlab/x86-glibc/iconv'
make[1]: *** [Makefile:484: iconv/subdir_lib] Error 2
make[1]: Leaving directory '/export/gnu/import/git/gitlab/x86-glibc'
make: *** [Makefile:9: all] Error 2
This is triggered by the rule in Makerules:
$(inst_includedir)/%.h: $(..)include/%.h $(+force)
$(do-install)
Since no files under include/ should be installed, remove it from
Makerules.
Tested it on x86-64. There are no differences in the installed header
files.
