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GNU C Library master sources branch master updated. glibc-2.26.9000-1107-gf993b87
- From: fw at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 10 Jan 2018 12:18:44 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.26.9000-1107-gf993b87
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=f993b8754080ac7572b692870e926d8b493db16c
commit f993b8754080ac7572b692870e926d8b493db16c
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Jan 10 13:18:04 2018 +0100
nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636]
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>
diff --git a/ChangeLog b/ChangeLog
index b1da834..1065883 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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.
+
2018-01-10 Samuel Thibault <samuel.thibault@ens-lyon.org>
* hurd/hurd/fd.h: Include <fcntl.h>
diff --git a/sysdeps/nptl/unwind-forcedunwind.c b/sysdeps/nptl/unwind-forcedunwind.c
index ab4350d..67b8e74 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
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 ++++++
sysdeps/nptl/unwind-forcedunwind.c | 2 +-
2 files changed, 7 insertions(+), 1 deletions(-)
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