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Author SHA1 Message Date
Florian Weimer
8dcb6d0af0 dlfcn: Do not use rtld_active () to determine ld.so state (bug 29078) 
When audit modules are loaded, ld.so initialization is not yet
complete, and rtld_active () returns false even though ld.so is
mostly working.  Instead, the static dlopen hook is used, but that
does not work at all because this is not a static dlopen situation.

Commit 466c1ea15f ("dlfcn: Rework
static dlopen hooks") moved the hook pointer into _rtld_global_ro,
which means that separate protection is not needed anymore and the
hook pointer can be checked directly.

The guard for disabling libio vtable hardening in _IO_vtable_check
should stay for now.

Fixes commit 8e1472d2c1 ("ld.so:
Examine GLRO to detect inactive loader [BZ #20204]").

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 2022-04-26 14:24:36 +02:00
Florian Weimer
c935789bdf INSTALL: Rephrase -with-default-link documentation 
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
 2022-04-26 14:22:23 +02:00
Fangrui Song
1305edd42c elf: Move post-relocation code of _dl_start into _dl_start_final 
On non-PI_STATIC_AND_HIDDEN architectures, getting the address of
_rtld_local_ro (for GLRO (dl_final_object)) goes through a GOT entry.
The GOT load may be reordered before self relocation, leading to an
unrelocated/incorrect _rtld_local_ro address.

84e02af1eb tickled GCC powerpc32 to
reorder the GOT load before relative relocations, leading to ld.so
crash. This is similar to the m68k jump table reordering issue fixed by
a8e9b5b807.

Move code after self relocation into _dl_start_final to avoid the
reordering. This fixes powerpc32 and may help other architectures when
ELF_DYNAMIC_RELOCATE is simplified in the future.
 2022-04-25 10:30:27 -07:00
Joan Bruguera
33e03f9cd2 misc: Fix rare fortify crash on wchar funcs. [BZ 29030] 
If `__glibc_objsize (__o) == (size_t) -1` (i.e. `__o` is unknown size), fortify
checks should pass, and `__whatever_alias` should be called.

Previously, `__glibc_objsize (__o) == (size_t) -1` was explicitly checked, but
on commit a643f60c53, this was moved into `__glibc_safe_or_unknown_len`.

A comment says the -1 case should work as: "The -1 check is redundant because
since it implies that __glibc_safe_len_cond is true.". But this fails when:
* `__s > 1`
* `__osz == -1` (i.e. unknown size at compile time)
* `__l` is big enough
* `__l * __s <= __osz` can be folded to a constant
(I only found this to be true for `mbsrtowcs` and other functions in wchar2.h)

In this case `__l * __s <= __osz` is false, and `__whatever_chk_warn` will be
called by `__glibc_fortify` or `__glibc_fortify_n` and crash the program.

This commit adds the explicit `__osz == -1` check again.
moc crashes on startup due to this, see: https://bugs.archlinux.org/task/74041

Minimal test case (test.c):
    #include <wchar.h>

    int main (void)
    {
        const char *hw = "HelloWorld";
        mbsrtowcs (NULL, &hw, (size_t)-1, NULL);
        return 0;
    }

Build with:
    gcc -O2 -Wp,-D_FORTIFY_SOURCE=2 test.c -o test && ./test

Output:
    *** buffer overflow detected ***: terminated

Fixes: BZ #29030
Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-04-25 17:32:30 +05:30
Fangrui Song
693517b922 elf: Remove unused enum allowmask 
Unused since 52a01100ad
("elf: Remove ad-hoc restrictions on dlopen callers [BZ #22787]").

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-25 01:01:02 -07:00
Florian Weimer
b571f3adff scripts/glibcelf.py: Mark as UNSUPPORTED on Python 3.5 and earlier 
enum.IntFlag and enum.EnumMeta._missing_ support are not part of
earlier Python versions.
 2022-04-25 09:14:49 +02:00
Noah Goldstein
c966099cdc x86: Optimize {str|wcs}rchr-evex 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.755
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:43 -05:00
Noah Goldstein
df7e295d18 x86: Optimize {str|wcs}rchr-avx2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.832
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:40 -05:00
Noah Goldstein
5307aa9c18 x86: Optimize {str|wcs}rchr-sse2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.741
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:36 -05:00
Noah Goldstein
c2ff9555a1 benchtests: Improve bench-strrchr 
1. Use json-lib for printing results.
2. Expose all parameters (before pos, seek_char, and max_char where
   not printed).
3. Add benchmarks that test multiple occurence of seek_char in the
   string.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:07:54 -05:00
H.J. Lu
8ea20ee5f6 x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32 
Clear the upper 32 bits in RDX (memory size) for x32 to fix

FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp

on x32 introduced by

8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
 2022-04-22 11:23:15 -07:00
Florian Weimer
198abcbb94 Default to --with-default-link=no (bug 25812) 
This is necessary to place the libio vtables into the RELRO segment.
New tests elf/tst-relro-ldso and elf/tst-relro-libc are added to
verify that this is what actually happens.

The new tests fail on ia64 due to lack of (default) RELRO support
inbutils, so they are XFAILed there.
 2022-04-22 10:59:03 +02:00
Florian Weimer
30035d6772 scripts: Add glibcelf.py module 
Hopefully, this will lead to tests that are easier to maintain.  The
current approach of parsing readelf -W output using regular expressions
is not necessarily easier than parsing the ELF data directly.

This module is still somewhat incomplete (e.g., coverage of relocation
types and versioning information is missing), but it is sufficient to
perform basic symbol analysis or program header analysis.

The EM_* mapping for architecture-specific constant classes (e.g.,
SttX86_64) is not yet implemented.  The classes are defined for the
benefit of elf/tst-glibcelf.py.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-04-22 10:58:32 +02:00
Emil Soleyman-Zomalan
3e29dc5233 Add locale for syr_SY 2022-04-21 13:05:40 +02:00
Fangrui Song
84e02af1eb elf: Move elf_dynamic_do_Rel RTLD_BOOTSTRAP branches outside 
elf_dynamic_do_Rel checks RTLD_BOOTSTRAP in several #ifdef branches.
Create an outside RTLD_BOOTSTRAP branch to simplify reasoning about the
function at the cost of a few duplicate lines.

Since dl_naudit is zero in RTLD_BOOTSTRAP code, the RTLD_BOOTSTRAP
branch can avoid _dl_audit_symbind calls to decrease code size.

Reviewed-by: Adheemrval Zanella  <adhemerval.zanella@linaro.org>
 2022-04-20 13:52:45 -07:00
Fangrui Song
a8e9b5b807 m68k: Handle fewer relocations for RTLD_BOOTSTRAP (#BZ29071) 
m68k is a non-PI_STATIC_AND_HIDDEN arch which uses a GOT relocation when
loading the address of a jump table. The GOT load may be reordered
before processing R_68K_RELATIVE relocations, leading to an
unrelocated/incorrect jump table, which will cause a crash.

The foolproof approach is to add an optimization barrier (e.g. calling
an non-inlinable function after relative relocations are resolved). That
is non-trivial given the current code structure, so just use the simple
approach to avoid the jump table: handle only the essential reloctions
for RTLD_BOOTSTRAP code.

This is based on Andreas Schwab's patch and fixed ld.so crash on m68k.

Reviewed-by: Adheemrval Zanella  <adhemerval.zanella@linaro.org>
 2022-04-20 10:24:16 -07:00
Adhemerval Zanella
62be968167 nptl: Fix pthread_cancel cancelhandling atomic operations 
The 404656009b reversion did not setup the atomic loop to set the
cancel bits correctly.  The fix is essentially what pthread_cancel
did prior 26cfbb7162.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.
 2022-04-20 12:01:43 -03:00
Noah Goldstein
c72a1a062a x86: Fix missing __wmemcmp def for disable-multiarch build 
commit 8804157ad9
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Fri Apr 15 12:27:59 2022 -0500

    x86: Optimize memcmp SSE2 in memcmp.S

Only defined wmemcmp and missed __wmemcmp. This commit fixes that by
defining __wmemcmp and setting wmemcmp as a weak alias to __wmemcmp.

Both multiarch and disable-multiarch builds succeed and full xchecks
pass.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-19 20:18:57 -05:00
Fangrui Song
3e9acce8c5 elf: Remove __libc_init_secure 
After 73fc4e28b9,
__libc_enable_secure_decided is always 0 and a statically linked
executable may overwrite __libc_enable_secure without considering
AT_SECURE.

The __libc_enable_secure has been correctly initialized in _dl_aux_init,
so just remove __libc_enable_secure_decided and __libc_init_secure.
This allows us to remove some startup_get*id functions from
22b79ed7f4.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-19 15:52:27 -07:00
=Joshua Kinard
78fb888273 mips: Fix mips64n32 64 bit time_t stat support (BZ#29069) 
Add missing support initially added by 4e8521333b
(which missed n32 stat).
 2022-04-18 10:02:25 -03:00
Noah Goldstein
23102686ec x86: Cleanup page cross code in memcmp-avx2-movbe.S 
Old code was both inefficient and wasted code size. New code (-62
bytes) and comparable or better performance in the page cross case.

geometric_mean(N=20) of page cross cases New / Original: 0.960

size, align0, align1, ret, New Time/Old Time
   1,   4095,      0,   0,             1.001
   1,   4095,      0,   1,             0.999
   1,   4095,      0,  -1,               1.0
   2,   4094,      0,   0,               1.0
   2,   4094,      0,   1,               1.0
   2,   4094,      0,  -1,               1.0
   3,   4093,      0,   0,               1.0
   3,   4093,      0,   1,               1.0
   3,   4093,      0,  -1,               1.0
   4,   4092,      0,   0,             0.987
   4,   4092,      0,   1,               1.0
   4,   4092,      0,  -1,               1.0
   5,   4091,      0,   0,             0.984
   5,   4091,      0,   1,             1.002
   5,   4091,      0,  -1,             1.005
   6,   4090,      0,   0,             0.993
   6,   4090,      0,   1,             1.001
   6,   4090,      0,  -1,             1.003
   7,   4089,      0,   0,             0.991
   7,   4089,      0,   1,               1.0
   7,   4089,      0,  -1,             1.001
   8,   4088,      0,   0,             0.875
   8,   4088,      0,   1,             0.881
   8,   4088,      0,  -1,             0.888
   9,   4087,      0,   0,             0.872
   9,   4087,      0,   1,             0.879
   9,   4087,      0,  -1,             0.883
  10,   4086,      0,   0,             0.878
  10,   4086,      0,   1,             0.886
  10,   4086,      0,  -1,             0.873
  11,   4085,      0,   0,             0.878
  11,   4085,      0,   1,             0.881
  11,   4085,      0,  -1,             0.879
  12,   4084,      0,   0,             0.873
  12,   4084,      0,   1,             0.889
  12,   4084,      0,  -1,             0.875
  13,   4083,      0,   0,             0.873
  13,   4083,      0,   1,             0.863
  13,   4083,      0,  -1,             0.863
  14,   4082,      0,   0,             0.838
  14,   4082,      0,   1,             0.869
  14,   4082,      0,  -1,             0.877
  15,   4081,      0,   0,             0.841
  15,   4081,      0,   1,             0.869
  15,   4081,      0,  -1,             0.876
  16,   4080,      0,   0,             0.988
  16,   4080,      0,   1,              0.99
  16,   4080,      0,  -1,             0.989
  17,   4079,      0,   0,             0.978
  17,   4079,      0,   1,             0.981
  17,   4079,      0,  -1,              0.98
  18,   4078,      0,   0,             0.981
  18,   4078,      0,   1,              0.98
  18,   4078,      0,  -1,             0.985
  19,   4077,      0,   0,             0.977
  19,   4077,      0,   1,             0.979
  19,   4077,      0,  -1,             0.986
  20,   4076,      0,   0,             0.977
  20,   4076,      0,   1,             0.986
  20,   4076,      0,  -1,             0.984
  21,   4075,      0,   0,             0.977
  21,   4075,      0,   1,             0.983
  21,   4075,      0,  -1,             0.988
  22,   4074,      0,   0,             0.983
  22,   4074,      0,   1,             0.994
  22,   4074,      0,  -1,             0.993
  23,   4073,      0,   0,              0.98
  23,   4073,      0,   1,             0.992
  23,   4073,      0,  -1,             0.995
  24,   4072,      0,   0,             0.989
  24,   4072,      0,   1,             0.989
  24,   4072,      0,  -1,             0.991
  25,   4071,      0,   0,              0.99
  25,   4071,      0,   1,             0.999
  25,   4071,      0,  -1,             0.996
  26,   4070,      0,   0,             0.993
  26,   4070,      0,   1,             0.995
  26,   4070,      0,  -1,             0.998
  27,   4069,      0,   0,             0.993
  27,   4069,      0,   1,             0.999
  27,   4069,      0,  -1,               1.0
  28,   4068,      0,   0,             0.997
  28,   4068,      0,   1,               1.0
  28,   4068,      0,  -1,             0.999
  29,   4067,      0,   0,             0.996
  29,   4067,      0,   1,             0.999
  29,   4067,      0,  -1,             0.999
  30,   4066,      0,   0,             0.991
  30,   4066,      0,   1,             1.001
  30,   4066,      0,  -1,             0.999
  31,   4065,      0,   0,             0.988
  31,   4065,      0,   1,             0.998
  31,   4065,      0,  -1,             0.998
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:52 -05:00
Noah Goldstein
7cbc03d030 x86: Remove memcmp-sse4.S 
Code didn't actually use any sse4 instructions since `ptest` was
removed in:

commit 2f9062d717
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Wed Nov 10 16:18:56 2021 -0600

    x86: Shrink memcmp-sse4.S code size

The new memcmp-sse2 implementation is also faster.

geometric_mean(N=20) of page cross cases SSE2 / SSE4: 0.905

Note there are two regressions preferring SSE2 for Size = 1 and Size =
65.

Size = 1:
size, align0, align1, ret, New Time/Old Time
   1,      1,      1,   0,               1.2
   1,      1,      1,   1,             1.197
   1,      1,      1,  -1,               1.2

This is intentional. Size == 1 is significantly less hot based on
profiles of GCC11 and Python3 than sizes [4, 8] (which is made
hotter).

Python3 Size = 1        -> 13.64%
Python3 Size = [4, 8]   -> 60.92%

GCC11   Size = 1        ->  1.29%
GCC11   Size = [4, 8]   -> 33.86%

size, align0, align1, ret, New Time/Old Time
   4,      4,      4,   0,             0.622
   4,      4,      4,   1,             0.797
   4,      4,      4,  -1,             0.805
   5,      5,      5,   0,             0.623
   5,      5,      5,   1,             0.777
   5,      5,      5,  -1,             0.802
   6,      6,      6,   0,             0.625
   6,      6,      6,   1,             0.813
   6,      6,      6,  -1,             0.788
   7,      7,      7,   0,             0.625
   7,      7,      7,   1,             0.799
   7,      7,      7,  -1,             0.795
   8,      8,      8,   0,             0.625
   8,      8,      8,   1,             0.848
   8,      8,      8,  -1,             0.914
   9,      9,      9,   0,             0.625

Size = 65:
size, align0, align1, ret, New Time/Old Time
  65,      0,      0,   0,             1.103
  65,      0,      0,   1,             1.216
  65,      0,      0,  -1,             1.227
  65,     65,      0,   0,             1.091
  65,      0,     65,   1,              1.19
  65,     65,     65,  -1,             1.215

This is because A) the checks in range [65, 96] are now unrolled 2x
and B) because smaller values <= 16 are now given a hotter path. By
contrast the SSE4 version has a branch for Size = 80. The unrolled
version has get better performance for returns which need both
comparisons.

size, align0, align1, ret, New Time/Old Time
 128,      4,      8,   0,             0.858
 128,      4,      8,   1,             0.879
 128,      4,      8,  -1,             0.888

As well, out of microbenchmark environments that are not full
predictable the branch will have a real-cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:42 -05:00
Noah Goldstein
8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S 
New code save size (-303 bytes) and has significantly better
performance.

geometric_mean(N=20) of page cross cases New / Original: 0.634
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:35 -05:00
Adhemerval Zanella
ac0d208b54 misc: Use 64 bit time_t interfaces on syslog 
It also handles the highly unlikely case where localtime might return
NULL, in this case only the PRI is set to hopefully instruct the relay
to get eh TIMESTAMP (as defined by the RFC).

Checked on x86_64-linux-gnu and i686-linux-gnu.
 2022-04-15 10:41:54 -03:00
Adhemerval Zanella
cac6b54ae2 misc: syslog: Move SYSLOG_NAME to USE_MISC (BZ #16355) 
There is no easy solution as described on first comment in bug report,
and some code (like busybox) assumes facilitynames existance when
SYSLOG_NAMES is defined (so we can't just remove it as suggested in
comment #2).

So use the easier solution and guard it with __USE_MISC.
 2022-04-15 10:41:54 -03:00
Adhemerval Zanella
a583b6add4 misc: syslog: Use fixed-sized buffer and remove memstream 
A fixed-sized buffer is used instead of memstream for messages up to
1024 bytes to avoid the potential BUFSIZ (8K) malloc and free for
each syslog call.

Also, since the buffer size is know, memstream is replaced with a
malloced buffer for larger messages.

Checked on x86_64-linux-gnu.
 2022-04-15 10:41:54 -03:00
Adhemerval Zanella
f9f5c70e7f misc: syslog: Simplify implementation 
Use a temporary buffer for strftime instead of using internal libio
members, simplify fprintf call on the memstream and memory allocation,
use %b instead of %h, use dprintf instead of writev for LOG_PERROR.

Checked on x86_64-linux-gnu and i686-linux-gnu.
 2022-04-15 10:41:54 -03:00
Adhemerval Zanella
0cc15f45c9 misc: syslog: Fix indentation and style 
And also clenaup the headers, no semantic changes.
 2022-04-15 10:41:54 -03:00
Adhemerval Zanella
096c27684a misc: Add syslog test 
The test cover:

  - All possible priorities and facilities through TCP and UDP.
  - Same syslog tests for vsyslog.
  - Some openlog/syslog/close combinations.
  - openlog with LOG_CONS, LOG_PERROR, and LOG_PID.

Internally is done with a test-container where the main process mimics
the syslog server interface.

The test does not cover multithread and async-signal usage.

Checked on x86_64-linux-gnu.
 2022-04-15 10:41:50 -03:00
Adhemerval Zanella
e3fdbe9f39 support: Add xmkfifo 
Wrapper support mkfifo.
 2022-04-15 09:59:33 -03:00
Adhemerval Zanella
592b6d00aa stdio: Split __get_errname definition from errlist.c 
The loader does not need to pull all __get_errlist definitions
and its size is decreased:

Before:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 197774   11024     456  209254   33166 elf/ld.so

After:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 191510    9936     456  201902   314ae elf/ld.so

Checked on x86_64-linux-gnu.
 2022-04-15 09:37:57 -03:00
Noah Goldstein
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3 
The goal is to remove most SSSE3 function as SSE4, AVX2, and EVEX are
generally preferable. memcpy/memmove is one exception where avoiding
unaligned loads with `palignr` is important for some targets.

This commit replaces memmove-ssse3 with a better optimized are lower
code footprint verion. As well it aliases memcpy to memmove.

Aside from this function all other SSSE3 functions should be safe to
remove.

The performance is not changed drastically although shows overall
improvements without any major regressions or gains.

bench-memcpy geometric_mean(N=50) New / Original: 0.957

bench-memcpy-random geometric_mean(N=50) New / Original: 0.912

bench-memcpy-large geometric_mean(N=50) New / Original: 0.892

Benchmarks where run on Zhaoxin KX-6840@2000MHz See attached numbers
for all results.

More important this saves 7246 bytes of code size in memmove an
additional 10741 bytes by reusing memmove code for memcpy (total 17987
bytes saves). As well an additional 896 bytes of rodata for the jump
table entries.
 2022-04-14 23:21:42 -05:00
Noah Goldstein
d85916e30a x86: Remove mem{move|cpy}-ssse3-back 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:42 -05:00
Noah Goldstein
41bfe224e5 x86: Remove str{p}{n}cpy-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:42 -05:00
Noah Goldstein
e084ccd37e x86: Remove str{n}cat-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Noah Goldstein
c024a0b9cf x86: Remove str{n}{case}cmp-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Noah Goldstein
c725f408db x86: Remove {w}memcmp-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Adhemerval Zanella
404656009b nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029) 
Some Linux interfaces never restart after being interrupted by a signal
handler, regardless of the use of SA_RESTART [1].  It means that for
pthread cancellation, if the target thread disables cancellation with
pthread_setcancelstate and calls such interfaces (like poll or select),
it should not see spurious EINTR failures due the internal SIGCANCEL.

However recent changes made pthread_cancel to always sent the internal
signal, regardless of the target thread cancellation status or type.
To fix it, the previous semantic is restored, where the cancel signal
is only sent if the target thread has cancelation enabled in
asynchronous mode.

The cancel state and cancel type is moved back to cancelhandling
and atomic operation are used to synchronize between threads.  The
patch essentially revert the following commits:

  8c1c0aae20 nptl: Move cancel type out of cancelhandling
  2b51742531 nptl: Move cancel state out of cancelhandling
  26cfbb7162 nptl: Remove CANCELING_BITMASK

However I changed the atomic operation to follow the internal C11
semantic and removed the MACRO usage, it simplifies a bit the
resulting code (and removes another usage of the old atomic macros).

Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
and powerpc64-linux-gnu.

[1] https://man7.org/linux/man-pages/man7/signal.7.html

Reviewed-by: Florian Weimer <fweimer@redhat.com>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
 2022-04-14 12:48:31 -03:00
Stefan Liebler
2376944b9e S390: Add new s390 platform z16. 
The new IBM z16 is added to platform string array.
The macro _DL_PLATFORMS_COUNT is incremented.

_dl_hwcaps_subdir is extended by "z16" if HWCAP_S390_VXRS_PDE2
is set. HWCAP_S390_NNPA is not tested in _dl_hwcaps_subdirs_active
as those instructions may be replaced or removed in future.

tst-glibc-hwcaps.c is extended in order to test z16 via new marker5.

A fatal glibc error is dumped if glibc was build with architecture
level set for z16, but run on an older machine. (See dl-hwcap-check.h)
 2022-04-14 10:37:45 +02:00
Noah Goldstein
535e935a28 Replace {u}int_fast{16|32} with {u}int32_t 
On 32-bit machines this has no affect. On 64-bit machines
{u}int_fast{16|32} are set as {u}int64_t which is often not
ideal. Particularly x86_64 this change both saves code size and
may save instruction cost.

Full xcheck passes on x86_64.
 2022-04-13 21:23:04 -05:00
Adhemerval Zanella
d275970ab5 stdlib: Reflow and sort most variable assignments 2022-04-13 16:52:39 -03:00
Florian Weimer
4a41fc3cd9 elf: Fix memory leak in _dl_find_object_update (bug 29062) 
The count can be zero if an object has already been loaded as
an indirect dependency (so that l_searchlist.r_list in its link
map is still NULL) is promoted to global scope via RTLD_GLOBAL.

Fixes commit 5d28a8962d ("elf: Add _dl_find_object function").
 2022-04-13 14:19:04 +02:00
Samuel Thibault
45a8e05785 hurd: Define ELIBEXEC 
So we can implement it in the exec server.
 2022-04-12 22:16:40 +02:00
Samuel Thibault
67ab66541d hurd: Fix arbitrary error code 
ELIBBAD is Linux-specific.
 2022-04-12 22:15:48 +02:00
Carlos O'Donell
2fe48f5283 NEWS: Move PLT tracking slowdown to glibc 2.35. 
In commit 063f9ba220 the NEWS section
was accidentally added to the glibc 2.34 NEWS section. The NEWS entry
should have been added to glibc 2.35 which contained the committed
fix. This moves the NEWS entry to correct section.
 2022-04-12 13:26:10 -04:00
Szabolcs Nagy
707efc2955 Remove _dl_skip_args_internal declaration 
It does not seem to be used.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-12 14:42:26 +01:00
DJ Delorie
d2263bf50a test-container: Fix "unused code" warnings on HURD 
Comment out bits of code that are only used when we *have* pid
namespaces, to avoid "unused code" warnings.

Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

Message-Id: <xno817tnds.fsf@greed.delorie.com>
 2022-04-12 01:28:41 +02:00
Noah Goldstein
ac5f5a92ed Add .clang-format style file 
Went with version >= 11.0 since it covers most of the major features
and should be pretty universally accessibly.

There are some issues:

1.  indention of preprocessor directives:
    Unfortunately there doesn't appear to be a switch for a seperate
    'IndentWidth' for preprocessor directives vs. normal code so we
    are stuck either not indenting the directives or over-indenting
    them. i.e:
    Desired:
    ```
    #ifndef A
    # define B
    #endif
    ```
    Options:
    ```
    #ifndef A
    #  define B /* Two spaces instead of one.  */
    #endif

    #ifndef C
    #define D   /* No spaces.  */
    #endif
    ```
    Chose to over-indent as it generally seems easier to script
    halving all pre-processor indentations than counting the nested
    depth and indenting from scratch.

2.  concatenation of lines missing semi-colons:
    Throughout glibc there are macros used to setup aliasing that are
    outside of functions and don't end in semi-colons i.e:
    ```
    libc_hidden_def (__pthread_self)
    weak_alias (__pthread_self, pthread_self)
    ```

    clang-format reformats lines like these to:
    ```
    libc_hidden_def (__pthread_self) weak_alias (__pthread_self, pthread_self)
    ```

    which is generally undesirable.

Other than those two big concerns there are certainly some questions
diffs but for the most part it creates a easy to read and consistent
style.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
 2022-04-11 10:51:03 -05:00
Tom Coldrick
d2265570a7 manual: Avoid name collision in libm ULP table [BZ #28956] 
The 32-bit and 64-bit variants of RISC-V share the same name - "RISC-V"
- when generating the libm error table for the info pages. This
collision, and the way how the table is generated, mean that the values
in the final table for "RISC-V" may be either for the 32- or 64-bit
variant, with no indication as to which.

As an additional side-effect, this makes the build non-reproducible, as
the error table generated is dependent upon the host filesystem
implementation.

To solve this issue, the libm-test-ulps-name files for both variants
have been modified to include their word size, so as to remove the
collision and provide more accurate information in the table.

An alternative proposed was to merge the two variants' ULP values into a
single file, but this would mean that information about error values is
lost, as the two variants are not identical. Some differences are
considerable, notably the values for the exp() function are large.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
 2022-04-11 11:46:10 -04:00
Alan Modra
1a85970f41 powerpc: Relocate stinfo->main 
start_addresses in sysdeps/powerpc/powerpc64/start.S is historical
baggage that should disappear.  Until someone does that, relocating
stinfo->main by hand is one solution to the fact that the field may be
unrelocated at the time it is accessed.  This is similar to what is
done for dynamic tags via the D_PTR macro.  stinfo->init and
stinfo->fini are zero in both powerpc64/start.S and powerpc32/start.S,
so make it a little more obvious they are unused by passing NULLs to
LIBC_START_MAIN.  The makefile change is needed to pick up
elf/dl-static-tls.h from dl-machine.h.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
 2022-04-10 08:37:38 +09:30