glibc/sysdeps/generic
Florian Weimer 018f0fc3b8 elf: Support recursive use of dynamic TLS in interposed malloc
It turns out that quite a few applications use bundled mallocs that
have been built to use global-dynamic TLS (instead of the recommended
initial-exec TLS).  The previous workaround from
commit afe42e935b ("elf: Avoid some
free (NULL) calls in _dl_update_slotinfo") does not fix all
encountered cases unfortunatelly.

This change avoids the TLS generation update for recursive use
of TLS from a malloc that was called during a TLS update.  This
is possible because an interposed malloc has a fixed module ID and
TLS slot.  (It cannot be unloaded.)  If an initially-loaded module ID
is encountered in __tls_get_addr and the dynamic linker is already
in the middle of a TLS update, use the outdated DTV, thus avoiding
another call into malloc.  It's still necessary to update the
DTV to the most recent generation, to get out of the slow path,
which is why the check for recursion is needed.

The bookkeeping is done using a global counter instead of per-thread
flag because TLS access in the dynamic linker is tricky.

All this will go away once the dynamic linker stops using malloc
for TLS, likely as part of a change that pre-allocates all TLS
during pthread_create/dlopen.

Fixes commit d2123d6827 ("elf: Fix slow
tls access after dlopen [BZ #19924]").

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2024-07-01 19:02:11 +02:00
..
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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
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dl-procinfo.c Dummy dl-procinfo.c file for platforms which don't have one. 2002-02-01 18:25:44 +00:00
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link_map.h Initial support for GNU_PROPERTY_1_NEEDED 2021-10-07 10:26:08 -07:00
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 elf: Rework exception handling in the dynamic loader [BZ #25486] 2022-11-03 09:39:31 +01:00
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math_ldbl_opt.h Use PRINTF_LDBL_IS_DBL instead of __ldbl_is_dbl. 2018-12-05 18:15:43 -02:00
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math-use-builtins-fabs.h math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
math-use-builtins-ffs.h string: Use builtins for ffs and ffsll 2024-02-01 09:31:33 -03:00
math-use-builtins-floor.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
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math-use-builtins-logb.h Use GCC builtins for logb functions if desired. 2022-11-29 16:00:28 +08:00
math-use-builtins-lrint.h Use GCC builtins for lrint functions if desired. 2022-11-29 16:00:28 +08:00
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
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math-use-builtins-roundeven.h Use GCC builtins for roundeven functions if desired. 2021-06-27 07:56:57 -07:00
math-use-builtins-sqrt.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
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time64-compat.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
time-clockid.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tininess.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tls-internal-struct.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tls-internal.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tls-internal.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tls-setup.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tls.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-audit.h Move testsuite audit definitions to sysdeps tst-audit.h files. 2012-07-26 11:29:07 +00:00
tst-file-align.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unsecvars.h elf: Remove LD_HWCAP_MASK / tunable glibc.cpu.hwcap_mask 2024-06-18 10:45:36 +02:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2.c Remove ia64-linux-gnu 2024-01-08 17:09:36 -03:00
unwind-link.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-pe.c Update. 2004-03-10 10:04:19 +00:00
unwind-pe.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-resume.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-resume.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind.h Remove ia64-linux-gnu 2024-01-08 17:09:36 -03:00
utmp-equal.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
utmp-size.h login: Check default sizes of structs utmp, utmpx, lastlog 2024-04-19 14:38:17 +02:00
xstatver.h Remove mknod wrapper functions, move them to symbols 2020-10-09 17:02:06 -03:00