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H.J. Lu 6c57d32048 sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] 
Add _SC_MINSIGSTKSZ for the minimum signal stack size derived from
AT_MINSIGSTKSZ, which is the minimum number of bytes of free stack
space required in order to gurantee successful, non-nested handling
of a single signal whose handler is an empty function, and _SC_SIGSTKSZ
which is the suggested minimum number of bytes of stack space required
for a signal stack.

If AT_MINSIGSTKSZ isn't available, sysconf (_SC_MINSIGSTKSZ) returns
MINSIGSTKSZ.  On Linux/x86 with XSAVE, the signal frame used by kernel
is composed of the following areas and laid out as:

 ------------------------------
 | alignment padding          |
 ------------------------------
 | xsave buffer               |
 ------------------------------
 | fsave header (32-bit only) |
 ------------------------------
 | siginfo + ucontext         |
 ------------------------------

Compute AT_MINSIGSTKSZ value as size of xsave buffer + size of fsave
header (32-bit only) + size of siginfo and ucontext + alignment padding.

If _SC_SIGSTKSZ_SOURCE or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ
are redefined as

/* Default stack size for a signal handler: sysconf (SC_SIGSTKSZ).  */
 # undef SIGSTKSZ
 # define SIGSTKSZ sysconf (_SC_SIGSTKSZ)

/* Minimum stack size for a signal handler: SIGSTKSZ.  */
 # undef MINSIGSTKSZ
 # define MINSIGSTKSZ SIGSTKSZ

Compilation will fail if the source assumes constant MINSIGSTKSZ or
SIGSTKSZ.

The reason for not simply increasing the kernel's MINSIGSTKSZ #define
(apart from the fact that it is rarely used, due to glibc's shadowing
definitions) was that userspace binaries will have baked in the old
value of the constant and may be making assumptions about it.

For example, the type (char [MINSIGSTKSZ]) changes if this #define
changes.  This could be a problem if an newly built library tries to
memcpy() or dump such an object defined by and old binary.
Bounds-checking and the stack sizes passed to things like sigaltstack()
and makecontext() could similarly go wrong.
2021-02-01 11:00:52 -08:00
..
net Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
netinet Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
nfs Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sys Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
_G_config.h Post-cleanup 2: minimize _G_config.h. 2018-02-07 10:10:32 -05:00
_itoa.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
a.out.h
abort-instr.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
adaptive_spin_count.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
aio_misc.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
allocalim.h
arch-fd_to_filename.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
c++-types.data Add placeholder c++-types.data and *.abilist files. 2015-02-13 15:41:34 -08:00
confstr.h
crti.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
crtn.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
device-nrs.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dirstream.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-auxv.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-cache.h ldconfig/x86: Store ISA level in cache and aux cache 2021-01-13 05:51:17 -08:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-dtv.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-fcntl.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-fileid.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-fptr.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-hash.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-irel.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-isa-level.h ldconfig/x86: Store ISA level in cache and aux cache 2021-01-13 05:51:17 -08:00
dl-librecon.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-machine.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-mman.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-osinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-procinfo.c
dl-procinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-procruntime.c ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
dl-prop.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tls.h
dl-unistd.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-vdso-setup.c elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
dl-vdso-setup.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-vdso.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dwarf2.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
elf_machine_sym_no_match.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
elf-initfini.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
elf-read-prop.h ldconfig/x86: Store ISA level in cache and aux cache 2021-01-13 05:51:17 -08:00
elide.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
eloop-threshold.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
entry.h
errqueue.h
exit-thread.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fd_to_filename.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fenv_private.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fips-private.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fix-fp-int-compare-invalid.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fix-fp-int-convert-overflow.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
float128-abi.h Move some float128 symbol version definitions. 2017-10-16 22:04:42 +00:00
fork.h
fpu_control.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
framestate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
gcc-compat.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
gccframe.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
get-rounding-mode.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
hp-timing-common.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
hp-timing.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ifreq.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ifunc-init.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ifunc-sel.h Do not stack-protect ifunc resolvers [BZ #7065] 2016-12-26 10:08:41 +01:00
internal-signals.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
intr-msg.h
ld.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
ldbl-classify-compat.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ldconfig.h ldconfig/x86: Store ISA level in cache and aux cache 2021-01-13 05:51:17 -08:00
ldsodefs.h sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] 2021-02-01 11:00:52 -08:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc-lock.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-mmap.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-mtag.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-start.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-tsd.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc.abilist Add the __libc_single_threaded variable 2020-07-06 11:15:58 +02:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm-alias-double.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libm-alias-float128.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libm-alias-float.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libm-alias-ldouble.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libm-test-ulps Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-ulps-name Do not hardcode platform names in manual/libm-err-tab.pl (bug 14139). 2016-11-04 16:49:06 +00:00
libm.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libnsl.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
libnss_compat.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_db.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_dns.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_files.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_hesiod.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nis.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nisplus.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
link_map.h ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
linkmap.h Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
local-setxid.h * sysdeps/posix/spawni.c (__spawni): Use local_seteuid and 2006-06-04 22:17:06 +00:00
localplt.data ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486] 2020-02-15 11:01:23 +01:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
machine-lock.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
machine-sp.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
malloc-alignment.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
malloc-machine.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
malloc-sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math_ldbl_opt.h Use PRINTF_LDBL_IS_DBL instead of __ldbl_is_dbl. 2018-12-05 18:15:43 -02:00
math_ldbl.h Allow direct use of math_ldbl.h in testsuite. 2017-02-25 10:40:48 -05:00
math_private_calls.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math_private.h ieee754: Remove unused __sin32 and __cos32 2020-12-18 12:10:31 +05:30
math-barriers.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-nan-payload-double.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-nan-payload-float.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-narrow-alias-float128.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-arch.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-exceptions.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-rounding.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-snan-cast.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-snan-payload.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-snan.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-trap-force.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests-trap.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-tests.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-type-macros-double.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-type-macros-float128.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-type-macros-float.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-type-macros-ldouble.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-type-macros.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math-use-builtins-ceil.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-copysign.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-floor.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fma.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-nearbyint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-rint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-round.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-sqrt.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-trunc.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memcopy.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memusage.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mmap_info.h posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
not-cancel.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
not-errno.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
nscd-types.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pagecopy.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
paths.h generic paths.h: remove old paths from _PATH_STDPATH 2012-11-04 10:11:39 +01:00
profil-counter.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
pty-private.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
register-dump.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rtld-lowlevel.h Jakub Jelinek <jakub@redhat.com> 2006-10-10 00:51:29 +00:00
safe-fatal.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
setjmpP.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
siglist-compat.c signal: Move sys_siglist to a compat symbol 2020-07-07 14:10:58 -03:00
siglist-compat.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
siglist.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sigset-cvt-mask.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sigsetops.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
single-thread.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stackguard-macros.h BZ #15754: Fix test case for ARM. 2013-09-23 01:44:38 -04:00
stackinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stap-probe-machine.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
startup.h Use <startup.h> in __libc_init_secure 2021-01-19 09:55:47 -08:00
stdio-lock.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
string_private.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
struct_stat_time64.h linux: Add {f}stat{at} y2038 support 2020-10-09 17:02:07 -03:00
symbol-hacks.h Break more lines before not after operators. 2019-02-25 13:19:19 +00:00
sysdep-cancel.h nptl: Remove tst-cancel-wrappers test and related macros 2019-01-03 18:38:08 -02:00
sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
thread_state.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
time-clockid.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tininess.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls-internal-struct.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls-internal.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls-internal.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls-macros.h
tls-setup.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-audit.h Move testsuite audit definitions to sysdeps tst-audit.h files. 2012-07-26 11:29:07 +00:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unsecvars.h Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug #21209) 2017-03-07 20:52:04 +05:30
unwind-arch.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-dw2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-pe.c
unwind-pe.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-resume.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
utmp-equal.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
xstatver.h Remove mknod wrapper functions, move them to symbols 2020-10-09 17:02:06 -03:00