glibc

Commit Graph

Author	SHA1	Message	Date
Tulio Magno Quites Machado Filho	ad47748992	Update INSTALL with package versions that are known to work Most packages have been tested with their latest releases, except for Python, whose latest version is 3.9.1. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	c3c4a25e65	aarch64: Move and update the definition of MTE_ENABLED The hwcap value is now in linux 5.10 and in glibc bits/hwcap.h, so use that definition. Move the definition to init-arch.h so all ifunc selectors can use it and expose an "mte" shorthand for mte enabled runtime. For now we allow user code to enable tag checks and use PROT_MTE mappings without libc involvment, this is not guaranteed ABI, but can be useful for testing and debugging with MTE.	5 years ago
Andreas Schwab	31f6488722	Fix misplaced const Constify __x86_cacheinfo_p and __x86_cpu_features_p, not their pointer target types.	5 years ago
Mao Han	fcfa4bb48d	Update C-SKY libm-test-ulps	5 years ago
John McCabe	56ef6ab0cd	manual: Correct argument order in mount examples [BZ #27207 ] Reviewed-by: DJ Delorie <dj@redhat.com>	5 years ago
Adhemerval Zanella	42d6270439	linux: mips: Fix getdents64 fallback on mips64-n32 GCC mainline shows the following error: ../sysdeps/unix/sysv/linux/mips/mips64/getdents64.c: In function '__getdents64': ../sysdeps/unix/sysv/linux/mips/mips64/getdents64.c:121:7: error: 'memcpy' forming offset [4, 7] is out of the bounds [0, 4] [-Werror=array-bounds] 121 \| memcpy (((char ) dp + offsetof (struct dirent64, d_ino)), \| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 122 \| KDP_MEMBER (kdp, d_ino), sizeof ((struct dirent64){0}.d_ino)); \| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../sysdeps/unix/sysv/linux/mips/mips64/getdents64.c:123:7: error: 'memcpy' forming offset [4, 7] is out of the bounds [0, 4] [-Werror=array-bounds] 123 \| memcpy (((char ) dp + offsetof (struct dirent64, d_off)), \| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 124 \| KDP_MEMBER (kdp, d_off), sizeof ((struct dirent64){0}.d_off)); \| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The issue is due both d_ino and d_off fields for mips64-n32 kernel_dirent are 32-bits, while this is using memcpy to copy 64 bits from it into the glibc dirent64. The fix is to use a temporary buffer to read the correct type from kernel_dirent. Checked with a build-many-glibcs.py for mips64el-linux-gnu and I also checked the tst-getdents64 on mips64el 4.1.4 kernel with and without fallback enabled (by manually setting the getdents64_supported).	5 years ago
H.J. Lu	5f478eb0fb	x86: Properly match CPU features in /proc/cpuinfo [BZ #27222 ] Search " YYY " and " YYY\n", instead of "YYY", to avoid matching "XXXYYYZZZ" with "YYY". Update /proc/cpuinfo CPU feature names: /proc/cpuinfo glibc ------------------------------------------------ avx512vbmi AVX512_VBMI dts DS pni SSE3 tsc_deadline_timer TSC_DEADLINE	5 years ago
H.J. Lu	f543259500	x86-64: Update tst-glibc-hwcaps-2.c for x86-64 baseline Return EXIT_FAILURE only if the level 2 libx86-64-isa-level.so is used on x86-64 baseline machine.	5 years ago
Florian Weimer	527c89cd32	powerpc64: Select POWER9 machine for the scv instruction It is not available with the baseline ISA. Fixes commit `68ab82f566` ("powerpc: Runtime selection between sc and scv for syscalls"). Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>	5 years ago
H.J. Lu	7a5ab88e21	x86: Check ifunc resolver with CPU_FEATURE_USABLE [BZ #27072 ] Check ifunc resolver with CPU_FEATURE_USABLE and tunables in dynamic and static executables to verify that CPUID features are initialized early in static PIE. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Adhemerval Zanella	46c1c765d1	Revert "linux: Move {f}xstat{at} to compat symbols" for static build This reverts commit `20b39d5946` for static library. This avoids the need to rebuild the world for the case where libstdc++ (and potentially other libraries) are linked to a old glibc. To avoid requering to provide xstat symbols for newer ABIs (such as riscv32) a new LIB_COMPAT macro is added. It is similar to SHLIB_COMPAT but also works for static case (thus evaluating similar to SHLIB_COMPAT for both shared and static case). Checked with a check-abi on all affected ABIs. I also check if the static library does contains the xstat symbols.	5 years ago
Shuo Wang	28f2ce2772	aarch64: revert memcpy optimze for kunpeng to avoid performance degradation In commit `863d775c48`, kunpeng920 is added to default memcpy version, however, there is performance degradation when the copy size is some large bytes, eg: 100k. This is the result, tested in glibc-2.28: before backport after backport Performance improvement memcpy_1k 0.005 0.005 0.00% memcpy_10k 0.032 0.029 10.34% memcpy_100k 0.356 0.429 -17.02% memcpy_1m 7.470 11.153 -33.02% This is the demo #include "stdio.h" #include "string.h" #include "stdlib.h" char a[10241024] = {12}; char b[10241024] = {13}; int main(int argc, char argv[]) { int i = atoi(argv[1]); int j; int size = atoi(argv[2]); for (j = 0; j < i; j++) memcpy(b, a, size1024); return 0; } # gcc -g -O0 memcpy.c -o memcpy # time taskset -c 10 ./memcpy 100000 1024 Co-authored-by: liqingqing <liqingqing3@huawei.com>	5 years ago
Szabolcs Nagy	2682695e5c	Make libc symbols hidden in static PIE Hidden visibility can avoid indirections and RELATIVE relocs in static PIE libc. The check should use IS_IN_LIB instead of IS_IN(libc) since all symbols are defined locally in static PIE and the optimization is useful in all libraries not just libc. However the test system links objects from libcrypt.a into dynamic linked test binaries where hidden visibility does not work. I think mixing static and shared libc components in the same binary should not be supported usage, but to be safe only use hidden in libc.a. On some targets (i386) this optimization cannot be applied because hidden visibility PIE ifunc functions don't work, so it is gated by NO_HIDDEN_EXTERN_FUNC_IN_PIE. From -static-pie linked 'int main(){}' this shaves off 71 relative relocs on aarch64 and reduces code size by about 2k. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	86d439b06f	csu: Move static pie self relocation later [BZ #27072 ] IFUNC resolvers may depend on tunables and cpu feature setup so move static pie self relocation after those. It is hard to guarantee that the ealy startup code does not rely on relocations so this is a bit fragile. It would be more robust to handle RELATIVE relocs early and only IRELATIVE relocs later, but the current relocation processing code cannot do that. The early startup code up to relocation processing includes _dl_aux_init (auxvec); __libc_init_secure (); __tunables_init (__environ); ARCH_INIT_CPU_FEATURES (); _dl_relocate_static_pie (); These are simple enough that RELATIVE relocs can be avoided. The following steps include ARCH_SETUP_IREL (); ARCH_SETUP_TLS (); ARCH_APPLY_IREL (); On some targets IRELATIVE processing relies on TLS setup on others TLS setup relies on IRELATIVE relocs, so the right position for _dl_relocate_static_pie is target dependent. For now move self relocation as early as possible on targets that support static PIE. Fixes bug 27072. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	47618209d0	Use hidden visibility for early static PIE code Extern symbol access in position independent code usually involves GOT indirection which needs RELATIVE reloc in a static linked PIE. (On some targets this is avoided e.g. because the linker can relax a GOT access to a pc-relative access, but this is not generally true.) Code that runs before static PIE self relocation must avoid relying on dynamic relocations which can be ensured by using hidden visibility. However we cannot just make all symbols hidden: On i386, all calls to IFUNC functions must go through PLT and calls to hidden functions CANNOT go through PLT in PIE since EBX used in PIE PLT may not be set up for local calls to hidden IFUNC functions. This patch aims to make symbol references hidden in code that is used before and by _dl_relocate_static_pie when building a static PIE libc. Note: for an object that is used in the startup code, its references and definition may not have consistent visibility: it is only forced hidden in the startup code. This is needed for fixing bug 27072. Co-authored-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	04af1eb313	csu: Avoid weak ref for __ehdr_start in static PIE All linkers support __ehdr_start that support static PIE linking, so there is no need to check for its presence via a weak reference. This avoids a RELATIVE relocation in static PIE startup code on some targets. With non-PIE static linking the weak ref check is kept in case the linker does not support __ehdr_start. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	374cef32ac	configure: Check for static PIE support Add SUPPORT_STATIC_PIE that targets can define if they support static PIE. This requires PI_STATIC_AND_HIDDEN support and various linker features as described in commit `9d7a3741c9` Add --enable-static-pie configure option to build static PIE [BZ #19574] Currently defined on x86_64, i386 and aarch64 where static PIE is known to work. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	bfe04789a8	elf: Avoid RELATIVE relocs in __tunables_init With static pie linking pointers in the tunables list need RELATIVE relocs since the absolute address is not known at link time. We want to avoid relocations so the static pie self relocation can be done after tunables are initialized. This is a simple fix that embeds the tunable strings into the tunable list instead of using pointers. It is possible to have a more compact representation of tunables with some additional complexity in the generator and tunable parser logic. Such optimization will be useful if the list of tunables grows. There is still an issue that tunables_strdup allocates and the failure handling code path is sufficiently complex that it can easily have RELATIVE relocations. It is possible to avoid the early allocation and only change environment variables in a setuid exe after relocations are processed. But that is a bigger change and early failure is fatal anyway so it is not as critical to fix right away. This is bug 27181. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Szabolcs Nagy	058308066c	elf: Make the tunable struct definition internal only The representation of the tunables including type information and the tunable list structure are only used in the implementation not in the tunables api that is exposed to usage within glibc. This patch moves the representation related definitions into the existing dl-tunable-types.h and uses that only for implementation. The tunable callback and related types are moved to dl-tunables.h because they are part of the tunables api. This reduces the details exposed in the tunables api so the internals are easier to change. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
H.J. Lu	ff6d62e9ed	<sys/platform/x86.h>: Remove the C preprocessor magic In <sys/platform/x86.h>, define CPU features as enum instead of using the C preprocessor magic to make it easier to wrap this functionality in other languages. Move the C preprocessor magic to internal header for better GCC codegen when more than one features are checked in a single expression as in x86-64 dl-hwcaps-subdirs.c. 1. Rename COMMON_CPUID_INDEX_XXX to CPUID_INDEX_XXX. 2. Move CPUID_INDEX_MAX to sysdeps/x86/include/cpu-features.h. 3. Remove struct cpu_features and __x86_get_cpu_features from <sys/platform/x86.h>. 4. Add __x86_get_cpuid_feature_leaf to <sys/platform/x86.h> and put it in libc. 5. Make __get_cpu_features() private to glibc. 6. Replace __x86_get_cpu_features(N) with __get_cpu_features(). 7. Add _dl_x86_get_cpu_features to GLIBC_PRIVATE. 8. Use a single enum index for each CPU feature detection. 9. Pass the CPUID feature leaf to __x86_get_cpuid_feature_leaf. 10. Return zero struct cpuid_feature for the older glibc binary with a smaller CPUID_INDEX_MAX [BZ #27104]. 11. Inside glibc, use the C preprocessor magic so that cpu_features data can be loaded just once leading to more compact code for glibc. 256 bits are used for each CPUID leaf. Some leaves only contain a few features. We can add exceptions to such leaves. But it will increase code sizes and it is harder to provide backward/forward compatibilities when new features are added to such leaves in the future. When new leaves are added, _rtld_global_ro offsets will change which leads to race condition during in-place updates. We may avoid in-place updates by 1. Rename the old glibc. 2. Install the new glibc. 3. Remove the old glibc. NB: A function, __x86_get_cpuid_feature_leaf , is used to avoid the copy relocation issue with IFUNC resolver as shown in IFUNC resolver tests.	5 years ago
Adhemerval Zanella	d7ee6bd8c2	posix: Fix fnmatch.c on bootstrap Only define FALLTHROUGH for _LIBC and do not check __clang_major__ value. It partially syncs with gnulib 5c52f00c69f39fe. Checked with build-many-glibcs.py for aarch64-linux-gnu.	5 years ago
Adhemerval Zanella	961d7cff51	stdlib: Add testcase for BZ #26241 Old implementation of realpath allocates a PATH_MAX using alloca for each symlink in the path, leading to MAXSYMLINKS times PATH_MAX maximum stack usage. The test create a symlink with __eloop_threshold() loops and creates a thread with minimum stack size (obtained through support_small_stack_thread_attribute). The thread issues a stack allocations that fill the thread allocated stack minus some slack plus and the realpath usage (which assumes a bounded stack usage). If realpath uses more than about 2 * PATH_MAX plus some slack it triggers a stackoverflow. Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>	5 years ago
Adhemerval Zanella	1006250ea2	posix: Fix regex_internal.h on bootstrap Only define FALLTHROUGH for _LIBC and do not check __clang_major__ value. It partially syncs with gnulib 5c52f00c69f39fe. Checked with build-many-glibcs.py for aarch64-linux-gnu, x86_64-linux-gnu, and s390x-linux-gnu.	5 years ago
H.J. Lu	22b79ed7f4	Use <startup.h> in __libc_init_secure Since __libc_init_secure is called before ARCH_SETUP_TLS, it must use "int $0x80" for system calls in i386 static PIE. Add startup_getuid, startup_geteuid, startup_getgid and startup_getegid to <startup.h>. Update __libc_init_secure to use them. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
H.J. Lu	cabc8a2916	elf: Avoid RELATIVE relocation for _dl_sysinfo Set the default _dl_sysinfo in _dl_aux_init to avoid RELATIVE relocation in static PIE. This is needed for fixing bug 27072 on x86. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
H.J. Lu	0ec583d926	libmvec: Add extra-test-objs to test-extras Add extra-test-objs to test-extras so that they are compiled with -DMODULE_NAME=testsuite instead of -DMODULE_NAME=libc. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
H.J. Lu	0887fff0b0	Hurd: Add rtld-strncpy-c.c All IFUNC functions which are used in ld.so must have a rtld version if the IFUNC version isn't safe to use in ld.so.	5 years ago
Joseph Myers	202586f73e	Update MIPS libm-test-ulps.	5 years ago
Joseph Myers	07169fcac7	Update arm libm-test-ulps.	5 years ago
Joseph Myers	a031b3abad	Update powerpc-nofpu libm-test-ulps.	5 years ago
John David Anglin	f678099de9	Update hppa libm-test-ulps	5 years ago
Vineet Gupta	96f17e6e63	ARC: nofpu: Regenerate ulps	5 years ago
H.J. Lu	86f65dffc2	ld.so: Add --list-tunables to print tunable values Pass --list-tunables to ld.so to print tunables with min and max values. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	6 years ago
Stafford Horne	cc528f9a7e	math/test-tgmath2: Fix fabs failure when no long double I have been testing with GCC trunk and GLIBC master while working on the OpenRISC port. This test has been failing with fabs not being called, This is caused as my architecture is configure with no long double meaning the two calls are the same: TEST (fabs (Vdouble1), double, fabs); TEST (fabs (Vldouble1), ldouble, fabs); Instead of the tgmath calls resolving to fabs and fabsl both calls are fabs. Next, do to compiler optimiations the second call is eliminated. Fix this by invoking the failing TEST with Vldouble2. Note, I also updated the FAIL message to more clearly show where the failure happened, so I see: FAIL: math/test-tgmath2 original exit status 1 wrong function called, fabs (ldouble) failure on line 174 Cc: Joseph Myers <joseph@codesourcery.com>	5 years ago
H.J. Lu	2d651eb926	x86: Move x86 processor cache info to cpu_features 1. Move x86 processor cache info to _dl_x86_cpu_features in ld.so. 2. Update tunable bounds with TUNABLE_SET_WITH_BOUNDS. 3. Move x86 cache info initialization to dl-cacheinfo.h and initialize x86 cache info in init_cpu_features (). 4. Put x86 cache info for libc in cacheinfo.h, which is included in libc-start.c in libc.a and is included in cacheinfo.c in libc.so. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	6 years ago
Adhemerval Zanella	d18f59bf92	Fix x86 build with --enable-tunable=no Checked on x86_64-linux-gnu.	5 years ago
H.J. Lu	7137d682eb	ifuncmain6pie: Remove the circular IFUNC dependency [BZ #20019 ] On x86, ifuncmain6pie failed with: [hjl@gnu-cfl-2 build-i686-linux]$ ./elf/ifuncmain6pie --direct ./elf/ifuncmain6pie: IFUNC symbol 'foo' referenced in '/export/build/gnu/tools-build/glibc-32bit/build-i686-linux/elf/ifuncmod6.so' is defined in the executable and creates an unsatisfiable circular dependency. [hjl@gnu-cfl-2 build-i686-linux]$ readelf -rW elf/ifuncmod6.so \| grep foo 00003ff4 00000706 R_386_GLOB_DAT 0000400c foo_ptr 00003ff8 00000406 R_386_GLOB_DAT 00000000 foo 0000400c 00000401 R_386_32 00000000 foo [hjl@gnu-cfl-2 build-i686-linux]$ Remove non-JUMP_SLOT relocations against foo in ifuncmod6.so, which trigger the circular IFUNC dependency, and build ifuncmain6pie with -Wl,-z,lazy.	5 years ago
Siddhesh Poyarekar	cf12900645	Use the right argument code in unnormal tests Use the right argument code (j) in the unnormal tests and cast inputs from the ieee_long_double_shape_type struct to Float64x to properly test it.	5 years ago
H.J. Lu	efbbd9c33a	ldconfig/x86: Store ISA level in cache and aux cache Store ISA level in the portion of the unused upper 32 bits of the hwcaps field in cache and the unused pad field in aux cache. ISA level is stored and checked only for shared objects in glibc-hwcaps subdirectories. The shared objects in the default directories aren't checked since there are no fallbacks for these shared objects. Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with --disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.	5 years ago
Szabolcs Nagy	86a4d3fa7d	elf: work around a gcc bug in elf_get_dynamic_info Since commit `2f056e8a5d` "aarch64: define PI_STATIC_AND_HIDDEN", building glibc with gcc-8 on aarch64 fails with /BLD/elf/librtld.os: in function `elf_get_dynamic_info': /SRC/elf/get-dynamic-info.h:70:(.text+0xad8): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against symbol `_rtld_local' defined in .data section in /BLD/elf/librtld.os This is a gcc bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98618 The bug is fixed on gcc-10 and not yet backported. gcc-9 is affected, but the issue happens to not trigger in glibc, gcc-8 and older seems to miscompile rtld.os. Rewriting the affected code in elf_get_dynamic_info seems to make the issue go away on <= gcc-9. The change makes the logic a bit clearer too (by separating the index computation and array update) and drops an older gcc workaround (since gcc 4.6 is no longer supported). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
H.J. Lu	2ef23b5205	x86: Set header.feature_1 in TCB for always-on CET [BZ #27177 ] Update dl_cet_check() to set header.feature_1 in TCB when both IBT and SHSTK are always on.	5 years ago
Adhemerval Zanella	f430293d84	posix: consume less entropy on tempname The first getrandom is used only for __GT_NOCREATE, which is inherently insecure and can use the entropy as a small improvement. On the second and later attempts it might help against DoS attacks. It sync with gnulib commit 854fbb81d91f7a0f2b463e7ace2499dee2f380f2. Checked on x86_64-linux-gnu.	5 years ago
Florian Weimer	0400f92833	Makerules: Do not require startup files for format.lds probe object During statically linked bootstrap, the compiler does not have the required startup files, so do a smaller dummy link to obtain the output format information. Fixes commit `87d583c6e8` ("install: Replace scripts/output-format.sed with objdump -f [BZ #26559]").	5 years ago
Fangrui Song	87d583c6e8	install: Replace scripts/output-format.sed with objdump -f [BZ #26559 ] GNU ld and gold have supported --print-output-format since 2011. glibc requires binutils>=2.25 (2015), so if LD is GNU ld or gold, we can assume the option is supported. lld is by default a cross linker supporting multiple targets. It auto detects the file format and does not need OUTPUT_FORMAT. It does not support --print-output-format. By parsing objdump -f, we can support all the three linkers. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>	5 years ago
Adhemerval Zanella	bf7db6d369	math: Add BZ#18980 fix back on dbl-64 cosh It is regression from `9e97f239ea` (Remove dbl-64/wordsize-64 (part 2)) where is missed to add the BZ#18980 fix (`9e97f239ea`). Checked on i686-linux-gnu.	5 years ago
Adhemerval Zanella	4dddd7e9cb	posix: Sync tempname with gnulib [BZ #26648 ] It syncs with gnulib commit b1268f22f443e8e4b9e. The try_tempname_len now uses getrandom on each iteration to get entropy and only uses the clock plus ASLR as source of entropy if getrandom fails. Checked on x86_64-linux-gnu and i686-linux-gnu.	6 years ago
Adhemerval Zanella	42dda89dcb	posix: Fix return value of system if shell can not be executed [BZ #27053 ] POSIX states that system returned code for failure to execute the shell shall be as if the shell had terminated using _exit(127). This behaviour was removed with `5fb7fc9635`. Checked on x86_64-linux-gnu.	5 years ago
Adhemerval Zanella	7b9c3260bc	support: Add xchmod wrapper Checked on x86_64-linux-gnu.	5 years ago
Joseph Myers	1c426b1d59	Update STATX_ATTR_DAX value from Linux 5.10. This patch updates the value of STATX_ATTR_DAX in bits/statx-generic.h for a change made in Linux 5.10. (As with previous such changes, this only does anything if glibc is being used with old kernel headers.) Tested for x86_64.	5 years ago
Vincent Chen	313bfd505e	riscv: Initialize $gp before resolving the IRELATIVE relocation The $gp register may be used to access the global variable in the PDE program, so the $gp register should be initialized before executing the IFUNC resolver of PDE program to avoid unexpected error occurs.	5 years ago

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