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nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636]

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Disabling lazy binding reduces stack usage during unwinding.

Note that RTLD_NOW only makes a difference if libgcc.so has not
already been loaded, so this is only a partial fix.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit f993b87540)
This commit is contained in:
Florian Weimer 2018-01-15 16:05:36 +01:00
parent 0b5cdd80c1
commit 89d6a65833
3 changed files with 8 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2018-01-10 Florian Weimer <fweimer@redhat.com>
[BZ #22636]
* sysdeps/nptl/unwind-forcedunwind.c (pthread_cancel_init): Open
libgcc.so with RTLD_NOW, to avoid lazy binding during unwind.
2018-01-08 Szabolcs Nagy <szabolcs.nagy@arm.com>
[BZ #22637]

1
NEWS
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@ -100,6 +100,7 @@ The following bugs are resolved with this release:
[22322] libc: [mips64] wrong bits/long-double.h installed
[22325] glibc: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
[22375] malloc returns pointer from tcache instead of NULL (CVE-2017-17426)
[22636] PTHREAD_STACK_MIN is too small on x86-64
[22627] $ORIGIN in $LD_LIBRARY_PATH is substituted twice
[22637] nptl: Fix stack guard size accounting
[22679] getcwd(3) can succeed without returning an absolute path

2
sysdeps/nptl/unwind-forcedunwind.c
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@ -49,7 +49,7 @@ pthread_cancel_init (void)
return;
}
handle = __libc_dlopen (LIBGCC_S_SO);
handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN);
if (handle == NULL
|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL