Bug 5465

Summary:	glibc-2.7 uses vdso symbol in pthread_cond_timedwait when !SHARED
Product:	glibc	Reporter:	Mike Frysinger <vapier>
Component:	nptl	Assignee:	Ulrich Drepper <drepper.fsp>
Status:	RESOLVED FIXED
Severity:	normal	CC:	glibc-bugs, spock, toolchain
Priority:	P2	Flags:	fweimer: security-
Version:	unspecified
Target Milestone:	---
Host:	x86_64-linux-gnu	Target:
Build:		Last reconfirmed:
Attachments:	glibc-libpthread-x86-64-vdso-SHARED.patch

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.