* [2.25 COMMITTED] nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636]
@ 2018-01-01 0:00 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2018-01-01 0:00 UTC (permalink / raw)
To: libc-stable
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 f993b8754080ac7572b692870e926d8b493db16c)
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.
diff --git a/NEWS b/NEWS
index fb54fa069c..e7eba7610d 100644
--- a/NEWS
+++ b/NEWS
@@ -66,6 +66,7 @@ The following bugs are resolved with this release:
[21972] assert macro requires operator== (int) for its argument type
[22078] nss_files performance issue in hosts multi mode
[22322] libc: [mips64] wrong bits/long-double.h installed
+ [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
diff --git a/sysdeps/nptl/unwind-forcedunwind.c b/sysdeps/nptl/unwind-forcedunwind.c
index 33a1975f5e..ace58b2468 100644
--- a/sysdeps/nptl/unwind-forcedunwind.c
+++ b/sysdeps/nptl/unwind-forcedunwind.c
@@ -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
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2018-01-01 0:00 [2.25 COMMITTED] nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636] Florian Weimer
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