Bug 5465 - glibc-2.7 uses vdso symbol in pthread_cond_timedwait when !SHARED
Summary: glibc-2.7 uses vdso symbol in pthread_cond_timedwait when !SHARED
Status: RESOLVED FIXED
Alias: None
Product: glibc
Classification: Unclassified
Component: nptl (show other bugs)
Version: unspecified
: P2 normal
Target Milestone: ---
Assignee: Ulrich Drepper
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-12-10 01:31 UTC by Mike Frysinger
Modified: 2014-07-03 11:51 UTC (History)
3 users (show)

See Also:
Host: x86_64-linux-gnu
Target:
Build:
Last reconfirmed:
fweimer: security-

Attachments
glibc-libpthread-x86-64-vdso-SHARED.patch (451 bytes, patch)
2007-12-10 01:32 UTC, Mike Frysinger 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

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Description Mike Frysinger 2007-12-10 01:31:56 UTC 
nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S was updated to call
clock_gettime via the VDSO if possible, but that vdso symbol is only provided
for SHARED code (see libc/sysdeps/unix/sysv/linux/x86_64/init-first.c).  thus,
linking against libpthread.a and using pthread_cond_timedwait() on x86_64 will
cause a link failure (undefined __vdso_clock_gettime symbol).

the attached patch by Michal Januszewski will only use the vdso symbol when
SHARED is defined.
Comment 1 Mike Frysinger 2007-12-10 01:32:41 UTC 
Created attachment 2131 [details]
glibc-libpthread-x86-64-vdso-SHARED.patch
Comment 2 Ulrich Drepper 2007-12-12 08:07:52 UTC 
Patch is in cvs.