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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
_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
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
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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
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
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
internal-signals.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
intr-msg.h
ld.abilist
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
libBrokenLocale.abilist
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
libdl.abilist
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
libm-test-ulps-name
libm.abilist
libnsl.abilist
libnss_compat.abilist
libnss_db.abilist
libnss_dns.abilist
libnss_files.abilist
libnss_hesiod.abilist
libnss_nis.abilist
libnss_nisplus.abilist
libpthread.abilist
libresolv.abilist
librt.abilist
libutil.abilist
link_map.h
linkmap.h
local-setxid.h
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
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
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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
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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
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
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
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
tst-stack-align.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unsecvars.h
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
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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