Commit Graph

37827 Commits

Author SHA1 Message Date
Fangrui Song
115d242456 x86_64: Remove unneeded static PIE check for undefined weak diagnostic
https://sourceware.org/bugzilla/show_bug.cgi?id=21782 dropped an ld
diagnostic for R_X86_64_PC32 referencing an undefined weak symbol in
-pie links.  Arguably keeping the diagnostic like other ports is more
correct, since statically resolving movl foo(%rip), %eax to the
link-time zero address produces a corrupted output.

It turns out that --enable-static-pie builds do not depend on the ld
behavior. GCC generates GOT indirection for weak declarations for
-fPIE/-fPIC, so what ld does with the PC-relative relocation doesn't
really matter.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2021-07-08 14:26:22 -07:00
Joseph Myers
bba4383c6b Add NT_ARM_PAC_ENABLED_KEYS to elf.h
This patch adds the new NT_ARM_PAC_ENABLED_KEYS constant from Linux
5.13 to glibc's elf.h.

Tested for x86_64.
2021-07-08 17:36:27 +00:00
Adhemerval Zanella
882d6e17bc posix: Add posix_spawn_file_actions_addclosefrom_np
This patch adds a way to close a range of file descriptors on
posix_spawn as a new file action.  The API is similar to the one
provided by Solaris 11 [1], where the file action causes the all open
file descriptors greater than or equal to input on to be closed when
the new process is spawned.

The function posix_spawn_file_actions_addclosefrom_np is safe to be
implemented by iterating over /proc/self/fd, since the Linux spawni.c
helper process does not use CLONE_FILES, so its has own file descriptor
table and any failure (in /proc operation) aborts the process creation
and returns an error to the caller.

I am aware that this file action might be redundant to the current
approach of POSIX in promoting O_CLOEXEC in more interfaces. However
O_CLOEXEC is still not the default and for some specific usages, the
caller needs to close all possible file descriptors to avoid them
leaking.  Some examples are CPython (discussed in BZ#10353) and OpenJDK
jspawnhelper [2] (where OpenJDK spawns a helper process to exactly
closes all file descriptors).  Most likely any environment which calls
functions that might open file descriptor under the hood and aim to use
posix_spawn might face the same requirement.

Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15.

[1] https://docs.oracle.com/cd/E36784_01/html/E36874/posix-spawn-file-actions-addclosefrom-np-3c.html
[2] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
2021-07-08 14:08:15 -03:00
Adhemerval Zanella
607449506f io: Add closefrom [BZ #10353]
The function closes all open file descriptors greater than or equal to
input argument.  Negative values are clamped to 0, i.e, it will close
all file descriptors.

As indicated by the bug report, this is a common symbol provided by
different systems (Solaris, OpenBSD, NetBSD, FreeBSD) and, although
its has inherent issues with not taking in consideration internal libc
file descriptors (such as syslog), this is also a common feature used
in multiple projects [1][2][3][4][5].

The Linux fallback implementation iterates over /proc and close all
file descriptors sequentially.  Although it was raised the questioning
whether getdents on /proc/self/fd might return disjointed entries
when file descriptor are closed; it does not seems the case on my
testing on multiple kernel (v4.18, v5.4, v5.9) and the same strategy
is used on different projects [1][2][3][5].

Also, the interface is set a fail-safe meaning that a failure in the
fallback results in a process abort.

Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15.

[1] 5238e95759/src/basic/fd-util.c (L217)
[2] ddf4b77e11/src/lxc/start.c (L236)
[3] 9e4f2f3a6b/Modules/_posixsubprocess.c (L220)
[4] 5f47c0613e/src/libstd/sys/unix/process2.rs (L303-L308)
[5] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
2021-07-08 14:08:14 -03:00
Adhemerval Zanella
286286283e linux: Add close_range
It was added on Linux 5.9 (278a5fbaed89) with CLOSE_RANGE_CLOEXEC
added on 5.11 (582f1fb6b721f).  Although FreeBSD has added the same
syscall, this only adds the symbol on Linux ports.  This syscall is
required to provided a fail-safe way to implement the closefrom
symbol (BZ #10353).

Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15.
2021-07-08 14:08:13 -03:00
Adhemerval Zanella
ae8c243d24 support: Add support_stack_alloc
The code to allocate a stack from xsigstack is refactored so it can
be more generic.  The new support_stack_alloc() also set PROT_EXEC
if DEFAULT_STACK_PERMS has PF_X.  This is required on some
 architectures (hppa for instance) and trying to access the rtld
global from testsuite will require more intrusive refactoring
in the ldsodefs.h header.

Checked on x86_64-linux-gnu and i686-linux-gnu.  I also ran
tst-xsigstack on both hppa and ia64.
2021-07-08 13:48:06 -03:00
Siddhesh Poyarekar
79969f41a7 _int_realloc is static
_int_realloc is correctly declared at the top to be static, but
incorrectly defined without the static keyword.  Fix that.  The
generated binaries have identical code.
2021-07-08 18:47:21 +05:30
Siddhesh Poyarekar
b8a19968b0 Move mcheck symbol from stdlib to malloc
It is defined in malloc, so it belongs there.  Verified on x86_64 that
the built libraries are identical despite this change.
2021-07-08 18:47:21 +05:30
Florian Weimer
9ed48feed8 nss: Do not install static linker input files for libnss_files 2021-07-08 14:06:53 +02:00
Siddhesh Poyarekar
5ceb1630bd elf/tests: Make thrlock and noload depend on libm
Both tests try to dlopen libm.so at runtime, so make them depend on it
so that they're executed if libm.so has been updated.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
2021-07-08 13:39:19 +05:30
Siddhesh Poyarekar
fc859c3048 Harden tcache double-free check
The tcache allocator layer uses the tcache pointer as a key to
identify a block that may be freed twice.  Since this is in the
application data area, an attacker exploiting a use-after-free could
potentially get access to the entire tcache structure through this
key.  A detailed write-up was provided by Awarau here:

https://awaraucom.wordpress.com/2020/07/19/house-of-io-remastered/

Replace this static pointer use for key checking with one that is
generated at malloc initialization.  The first attempt is through
getrandom with a fallback to random_bits(), which is a simple
pseudo-random number generator based on the clock.  The fallback ought
to be sufficient since the goal of the randomness is only to make the
key arbitrary enough that it is very unlikely to collide with user
data.

Co-authored-by: Eyal Itkin <eyalit@checkpoint.com>
2021-07-08 01:39:38 +05:30
Florian Weimer
f9c8b11ed7 nss: Access nss_files through direct references
This partially fixes static-only NSS support (bug 27959): The files
module no longer needs dlopen.  Support for the dns module remains
to be added, and also support for disabling dlopen altogether.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
6212bb67f4 nss_files: Move into libc
This is the first step towards fixing bug 27959.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
36861a968a nss_files: Add generic code for set*ent, end*ent and file open
This reduces RSS usage if nss_files is not actually used, and can
be used later to make NSS data thread-specific.  It also results in
a small code size reduction.

Before:

   text	   data	    bss	    dec	    hex	filename
   2288	      0	     72	   2360	    938	nss/files-alias.os
   1807	      0	     72	   1879	    757	nss/files-ethers.os
   1371	      0	     72	   1443	    5a3	nss/files-grp.os
   6246	      0	     72	   6318	   18ae	nss/files-hosts.os
    869	      0	      0	    869	    365	nss/files-initgroups.os
    666	      0	      0	    666	    29a	nss/files-init.os
   1934	      0	      0	   1934	    78e	nss/files-netgrp.os
   2353	      0	     72	   2425	    979	nss/files-network.os
   2130	      0	     72	   2202	    89a	nss/files-proto.os
   1372	      0	     72	   1444	    5a4	nss/files-pwd.os
   2124	      0	     72	   2196	    894	nss/files-rpc.os
   2265	      0	     72	   2337	    921	nss/files-service.os
   1125	      0	     72	   1197	    4ad	nss/files-sgrp.os
   1124	      0	     72	   1196	    4ac	nss/files-spwd.os

After:

   text	   data	    bss	    dec	    hex	filename
   2040	      0	      0	   2040	    7f8	nss/files-alias.os
   1599	      0	      0	   1599	    63f	nss/files-ethers.os
   1155	      0	      0	   1155	    483	nss/files-grp.os
   6010	      0	      0	   6010	   177a	nss/files-hosts.os
    869	      0	      0	    869	    365	nss/files-initgroups.os
    666	      0	      0	    666	    29a	nss/files-init.os
   1934	      0	      0	   1934	    78e	nss/files-netgrp.os
   2129	      0	      0	   2129	    851	nss/files-network.os
   1914	      0	      0	   1914	    77a	nss/files-proto.os
   1156	      0	      0	   1156	    484	nss/files-pwd.os
   1908	      0	      0	   1908	    774	nss/files-rpc.os
   2057	      0	      0	   2057	    809	nss/files-service.os
    909	      0	      0	    909	    38d	nss/files-sgrp.os
    908	      0	      0	    908	    38c	nss/files-spwd.os
   1090	      0	      8	   1098	    44a	nss/nss_files_data.os

27674 code bytes before, 26344 code bytes after, so it is an overall
win despite the extra initialization code.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
f0c28504a9 nss_files: Allocate nscd file registration data on the heap
This is only needed if nss_files is loaded by nscd.

Before:

   text	   data	    bss	    dec	    hex	filename
    767	      0	  24952	  25719	   6477	nss/files-init.os

After:

   text	   data	    bss	    dec	    hex	filename
    666	      0	      0	    666	    29a	nss/files-init.os

Using PATH_MAX bytes unconditionally for the directory name
is wasteful, but fixing that would constitute another break
of this semi-public ABI.  (The other issue is that with
symbolic links, an arbitrary set of parent directories may need
watching, not just a single one.)

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
7fcdb53253 libio: Replace internal _IO_getdelim symbol with __getdelim
__getdelim is exported, _IO_getdelim is not.  Add a hidden prototype
for __getdelim.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
771473a8c4 libio: Add hidden prototype for ungetc
And make ungetc the primary symbol, with _IO_ungetc as an alias.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Florian Weimer
c4ec8cab07 inet: Add hidden prototype for __inet_network
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 18:33:52 +02:00
Joseph Myers
26890e1cd0 Update MIPS libm-test-ulps 2021-07-07 15:50:18 +00:00
Joseph Myers
f517610f3a Update powerpc-nofpu libm-test-ulps 2021-07-07 15:35:04 +00:00
liuhongt
6ec6c77867 soft-fp: Add __extendhfsf2/__extendhfdf2, __truncsfhf2/__truncdfhf2, __eqhf2/__nehf2
1. Add __extendhfdf2/__extendhfsf2 to return an IEEE half converted to IEEE double/single.
2. Add __truncdfhf2/__extendsfhf2 to truncate IEEE double/single into IEEE half.
3. Add __eqhf2/__nehf2 to return 0 if a == b and a,b are not NAN, otherwise return 1.

These are needed by x86 _Float16:

https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html

support in GCC.
2021-07-07 08:01:32 -07:00
Joseph Myers
b46cfcef3f Update kernel version to 5.13 in tst-mman-consts.py
This patch updates the kernel version in the test tst-mman-consts.py
to 5.13.  (There are no new MAP_* constants covered by this test in
5.13 that need any other header changes.)

Tested with build-many-glibcs.py.
2021-07-07 13:24:05 +00:00
Siddhesh Poyarekar
fab3a6daf1 tests-exclude-mcheck: Fix typo
It's tst-realloc, not tst-posix-realloc.  Verified this time to ensure
that the total number of tests reduced by 1.

Reported-by: Stefan Liebler <stli@linux.ibm.com>
2021-07-07 13:28:53 +05:30
Florian Weimer
7a5db2e82f elf: Clean up GLIBC_PRIVATE exports of internal libdl symbols
They are no longer needed after everything has been moved into
libc.  The _dl_vsym test has to be removed because the symbol
cannot be used outside libc anymore.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 08:41:24 +02:00
Florian Weimer
ceda365fba nptl: Reduce the GLIBC_PRIVATE ABI
The remaining symbols are mostly used by libthread_db.
__pthread_get_minstack has to remain exported even though unused.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 08:41:21 +02:00
Florian Weimer
8ec022a037 nptl: Remove GLIBC_2.34 versions of __pthread_mutex_lock, __pthread_mutex_unlock
Now that there are no internal users anymore, these new symbol
versions can be removed from the public ABI.  The compatibility
symbols remain.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 08:41:17 +02:00
Florian Weimer
1f9c804fbd nptl: Use internal low-level lock type for !IS_IN (libc)
This avoids an ABI hazard (types changing between different modules
of glibc) without introducing linknamespace issues. In particular,
NSS modules now call __lll_lock_wait_private@@GLIBC_PRIVATE to wait
on internal locks (the unlock path is inlined and performs a direct
system call).

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 08:41:14 +02:00
Siddhesh Poyarekar
83e55c982f glibc.malloc.check: Fix nit in documentation
The tunable will not work with *any* non-zero tunable value since its
list of allowed values is 0-3.  Fix the documentation to reflect that.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-07 07:02:13 +05:30
Siddhesh Poyarekar
7042b53f11 Exclude tst-realloc from tests-mcheck
The realloc (NULL, 0) test in tst-realloc fails with gcc 7.x but
passes with newer gcc.  This is because a newer gcc transforms the
realloc call to malloc (0), thus masking the bug in mcheck.

Disable the test with mcheck for now.  The malloc removal patchset
will fix this and then remove this test from the exclusion list.

Reported-by: Stefan Liebler <stli@linux.ibm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-07-06 23:34:11 +05:30
Adhemerval Zanella
cf2256196c linux: Fix setsockopt fallback
The final 2 arguments for SO_TIMESTAMP/SO_TIMESTAMPNS are being set
wrongly.

Checked on x86_64-linux-gnu and i686-linux-gnu.
2021-07-06 11:45:35 -03:00
Adhemerval Zanella
f7de21498d linux: Use the expected size for SO_TIMESTAMP{NS} convertion
Kernel returns 32-bit values for COMPAT_SO_TIMESTAMP{NS}_OLD,
not 64-bit values.

Checked on x86_64-linux-gnu and i686-linux-gnu.
2021-07-06 11:45:35 -03:00
Adhemerval Zanella
4b93a93e40 linux: Consolidate Linux setsockopt implementation
This patch consolidates the setsockopt implementation on
sysdeps/unix/sysv/linux/getsockopt.c.  The changes are:

  1. Remove it from auto-generation syscalls.list on all architectures.

  2. Add __ASSUME_SETSOCKOPT_SYSCALL as default and undef if for
     specific kernel versions on some architectures.

This also fix a potential issue where 32-bit time_t ABI should use the
linux setsockopt which overrides the underlying SO_* constants used for
socket timestamping for _TIME_BITS=64.

Checked on x86_64-linux-gnu and i686-linux-gnu.
2021-07-06 11:45:35 -03:00
Adhemerval Zanella
1c46663a70 linux: Consolidate Linux getsockopt implementation
This patch consolidates the getsockopt Linux syscall implementation on
sysdeps/unix/sysv/linux/getsockopt.c.  The changes are:

  1. Remove it from auto-generation syscalls.list on all architectures.

  2. Add __ASSUME_GETSOCKOPT_SYSCALL as default and undef if for
     specific kernel versions on some architectures.

This also fix a potential issue where 32-bit time_t ABI should use the
linux getsockopt which overrides the underlying SO_* constants used for
socket timestamping for _TIME_BITS=64.

Checked on x86_64-linux-gnu and i686-linux-gnu.
2021-07-06 11:45:35 -03:00
Armin Brauns
b156c5f0a7 manual: fix description for preadv() 2021-07-06 16:23:15 +02:00
Florian Weimer
832f50be6c elf: Call free from base namespace on error in dl-libc.c [BZ #27646]
In dlerror_run, free corresponds to the local malloc in the
namespace, but GLRO (dl_catch_error) uses the malloc from the base
namespace.  elf/tst-dlmopen-gethostbyname triggers this mismatch,
but it does not crash, presumably because of a fastbin deallocation.

Fixes commit c2059edce2 ("elf: Use
_dl_catch_error from base namespace in dl-libc.c [BZ #27646]") and
commit b2964eb1d9 ("dlfcn: Failures
after dlmopen should not terminate process [BZ #24772]").
2021-07-06 14:30:33 +02:00
Khem Raj
c8935581de linux: Check for null value msghdr struct before use
This avoids crashes in libc when cmsg is null and refrencing msg
structure when it is null

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-07-05 15:11:13 -03:00
Siddhesh Poyarekar
91fb0f17a5 hooks.c: Remove incorrect comment
The comment about different values of glibc.malloc.check is no longer
valid.
2021-07-04 18:15:18 +05:30
Tulio Magno Quites Machado Filho
e766ce3088 mtrace: Add attribute nocommon to mallwatch
Avoid compilation errors GCC versions that do not default to
-fno-common, e.g. GCC <= 9.

Fixes commit 00d28960c5 ("mtrace:
Deprecate mallwatch and tr_break").

Suggested-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Suggested-by: Florian Weimer <fweimer@redhat.com>
2021-07-02 18:14:01 -03:00
Siddhesh Poyarekar
c501803035 Move glibc.malloc.check implementation into its own file
Separate the malloc check implementation from the malloc hooks.  They
still use the hooks but are now maintained in a separate file.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-07-03 00:48:12 +05:30
Siddhesh Poyarekar
00d28960c5 mtrace: Deprecate mallwatch and tr_break
The variable and function pair appear to provide a way for users to
set conditional breakpoints in mtrace when a specific address is
returned by the allocator.  This can be achieved by using conditional
breakpoints in gdb so it is redundant.  There is no documentation of
this interface in the manual either, so it appears to have been a hack
that got added to debug malloc.  Deprecate these symbols and do not
call tr_break anymore.

Reviewed-by: DJ Delorie <dj@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-07-03 00:47:34 +05:30
Siddhesh Poyarekar
7df5c7bcce Drop source dependencies on hooks.c and arena.c
Dependencies on hooks.c and arena.c get auto-computed when generating
malloc.o{,s}.d so there is no need to add them manually.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
2021-07-03 00:46:46 +05:30
JeffyChen
dfec225ee1 malloc: Initiate tcache shutdown even without allocations [BZ #28028]
After commit 1e26d35193 ("malloc: Fix
tcache leak after thread destruction [BZ #22111]"),
tcache_shutting_down is still not early enough.  When we detach a
thread with no tcache allocated, tcache_shutting_down would still be
false.

Reviewed-by: DJ Delorie <dj@redhat.com>
2021-07-02 17:39:24 +02:00
Siddhesh Poyarekar
784fff6ea5 Add mcheck tests to malloc
Like malloc-check, add generic rules to run all tests in malloc by
linking with libmcheck.a so as to provide coverage for mcheck().
Currently the following 12 tests fail:

FAIL: malloc/tst-malloc-backtrace-mcheck
FAIL: malloc/tst-malloc-fork-deadlock-mcheck
FAIL: malloc/tst-malloc-stats-cancellation-mcheck
FAIL: malloc/tst-malloc-tcache-leak-mcheck
FAIL: malloc/tst-malloc-thread-exit-mcheck
FAIL: malloc/tst-malloc-thread-fail-mcheck
FAIL: malloc/tst-malloc-usable-static-mcheck
FAIL: malloc/tst-malloc-usable-static-tunables-mcheck
FAIL: malloc/tst-malloc-usable-tunables-mcheck
FAIL: malloc/tst-malloc_info-mcheck
FAIL: malloc/tst-memalign-mcheck
FAIL: malloc/tst-posix_memalign-mcheck

and they have been added to tests-exclude-mcheck for now to keep
status quo.  At least the last two can be attributed to bugs in
mcheck() but I haven't fixed them here since they should be fixed by
removing malloc hooks.  Others need to be triaged to check if they're
due to mcheck bugs or due to actual bugs.

Reviewed-by: DJ Delorie <dj@redhat.com>
2021-07-02 17:03:42 +05:30
Siddhesh Poyarekar
7f784fabcb iconvconfig: Use the public feof_unlocked
Build of iconvconfig failed with CFLAGS=-Os since __feof_unlocked is
not a public symbol.  Replace with feof_unlocked (defined to
__feof_unlocked when IS_IN (libc)) to fix this.

Reported-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2021-07-02 16:53:25 +05:30
Florian Weimer
dbb949f53d resolv: Move libanl into libc (if libpthread is in libc)
The symbols gai_cancel, gai_error, gai_suspend, getaddrinfo_a,
__gai_suspend_time64 were moved using scripts/move-symbol-to-libc.py.

For Hurd (which remains !PTHREAD_IN_LIBC), a few #define redirects
had to be added because several pthread functions are not available
under __.  (Linux uses __ prefixes for most hidden aliases, and has
to in some cases to avoid linknamespace issues.)
2021-07-02 11:45:00 +02:00
Pedro Franco de Carvalho
813c6ec808 powerpc: optimize strcpy/stpcpy for POWER9/10
This patch modifies the current POWER9 implementation of strcpy and
stpcpy to optimize it for POWER9/10.

Since no new POWER10 instructions are used, the original POWER9 strcpy is
modified instead of creating a new implementation for POWER10.  This
implementation is based on both the original POWER9 implementation of
strcpy and the preamble of the new POWER10 implementation of strlen.

The changes also affect stpcpy, which uses the same implementation with
some additional code before returning.

On POWER9, averaging improvements across the benchmark
inputs (length/source alignment/destination alignment), for an
experiment that ran the benchmark five times, bench-strcpy showed an
improvement of 5.23%, and bench-stpcpy showed an improvement of 6.59%.

On POWER10, bench-strcpy showed 13.16%, and bench-stpcpy showed 13.59%.

The changes are:

1. Removed the null string optimization.

   Although this results in a few extra cycles for the null string, in
   combination with the second change, this resulted in improvements for
   for other cases.

2. Adapted the preamble from strlen for POWER10.

   This is the part of the function that handles up to the first 16 bytes
   of the string.

3. Increased number of unrolled iterations in the main loop to 6.

Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
Tested-by: Matheus Castanho <msc@linux.ibm.com>
2021-07-01 17:58:53 -03:00
H.J. Lu
8241409e29 soft-fp: Add __extendhfxf2 and __truncxfhf2
1. Add __extendhfxf2 to return an IEEE half converted to IEEE extended.
2. Add __truncxfhf2 to truncate IEEE extended into IEEE half.

These are needed by x86 _Float16:

https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html

support in GCC.
2021-07-01 11:02:58 -07:00
H.J. Lu
ea8e465a6b x86: Check RTM_ALWAYS_ABORT for RTM [BZ #28033]
From

https://www.intel.com/content/www/us/en/support/articles/000059422/processors.html

* Intel TSX will be disabled by default.
* The processor will force abort all Restricted Transactional Memory (RTM)
  transactions by default.
* A new CPUID bit CPUID.07H.0H.EDX[11](RTM_ALWAYS_ABORT) will be enumerated,
  which is set to indicate to updated software that the loaded microcode is
  forcing RTM abort.
* On processors that enumerate support for RTM, the CPUID enumeration bits
  for Intel TSX (CPUID.07H.0H.EBX[11] and CPUID.07H.0H.EBX[4]) continue to
  be set by default after microcode update.
* Workloads that were benefited from Intel TSX might experience a change
  in performance.
* System software may use a new bit in Model-Specific Register (MSR) 0x10F
  TSX_FORCE_ABORT[TSX_CPUID_CLEAR] functionality to clear the Hardware Lock
  Elision (HLE) and RTM bits to indicate to software that Intel TSX is
  disabled.

1. Add RTM_ALWAYS_ABORT to CPUID features.
2. Set RTM usable only if RTM_ALWAYS_ABORT isn't set.  This skips the
string/tst-memchr-rtm etc. testcases on the affected processors, which
always fail after a microcde update.
3. Check RTM feature, instead of usability, against /proc/cpuinfo.

This fixes BZ #28033.
2021-07-01 10:47:35 -07:00
Joseph Myers
b1b4f7209e Update syscall lists for Linux 5.13
Linux 5.13 has three new syscalls (landlock_create_ruleset,
landlock_add_rule, landlock_restrict_self).  Update syscall-names.list
and regenerate the arch-syscall.h headers with build-many-glibcs.py
update-syscalls.

Tested with build-many-glibcs.py.
2021-07-01 17:37:36 +00:00
Stefan Liebler
7c45df18e1 s390: Fix MEMCHR_Z900_G5 ifunc-variant if n>=0x80000000 [BZ #28024]
On s390 (31bit), the pointer to the first byte after s always wraps
around with n >= 0x80000000 and can lead to stop searching before
end of s.

Thus this patch just use NULL as byte after s in this case and
the srst instruction stops searching with "not found" when wrapping
around from top address to zero.

This is observable with testcase string/test-memchr
starting with commit "String: Add overflow tests for strnlen, memchr,
and strncat [BZ #27974]"
https://sourceware.org/git/?p=glibc.git;a=commit;h=da5a6fba0febbfc90896ce1b2eb75c6d8a88a72d
2021-07-01 16:46:59 +02:00