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* [Bug libc/18572] New: [arm] Lazy TLSDESC relocation has data race
@ 2015-06-22 11:27 nszabolcs at gmail dot com
2015-08-22 21:35 ` [Bug dynamic-link/18572] " jsm28 at gcc dot gnu.org
2015-10-14 16:02 ` cvs-commit at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: nszabolcs at gmail dot com @ 2015-06-22 11:27 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18572
Bug ID: 18572
Summary: [arm] Lazy TLSDESC relocation has data race
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: nszabolcs at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
same as bug 18034 but for 32bit arm.
With -mtls-dialect=gnu2, gcc generates TLSDESC code for TLS access on arm.
In glibc the arm TLSDESC entry functions in sysdeps/arm/dl-tlsdesc.S don't
synchronize with the initializer in tlsdesc.c, so an entry function may read
stale argument if the initialization happened concurrently on another cpu.
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* [Bug dynamic-link/18572] [arm] Lazy TLSDESC relocation has data race
2015-06-22 11:27 [Bug libc/18572] New: [arm] Lazy TLSDESC relocation has data race nszabolcs at gmail dot com
@ 2015-08-22 21:35 ` jsm28 at gcc dot gnu.org
2015-10-14 16:02 ` cvs-commit at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-08-22 21:35 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18572
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libc |dynamic-link
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* [Bug dynamic-link/18572] [arm] Lazy TLSDESC relocation has data race
2015-06-22 11:27 [Bug libc/18572] New: [arm] Lazy TLSDESC relocation has data race nszabolcs at gmail dot com
2015-08-22 21:35 ` [Bug dynamic-link/18572] " jsm28 at gcc dot gnu.org
@ 2015-10-14 16:02 ` cvs-commit at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2015-10-14 16:02 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18572
--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, master has been updated
via 1fae5a6800b07d0a8225664ac65a628bbe98cae7 (commit)
from f45e45a3e07ccd555a3130a9413fcebe6d8f5213 (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1fae5a6800b07d0a8225664ac65a628bbe98cae7
commit 1fae5a6800b07d0a8225664ac65a628bbe98cae7
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed Oct 14 16:58:41 2015 +0100
[BZ #19129][ARM] Fix _dl_tlsdesc_resolve_hold to save r0
_dl_tlsdesc_resolve_hold calls into a C function that clobbers r0,
but it assumes the original argument is still in r0 after the call.
This can cause crash in case of concurrent TLS access when TLSDESC
is in use (-mtls-dialect=gnu2).
Run into this while fixing BZ 18572.
Both r0 and r1 are saved/restored so the stack remains 8 byte aligned.
[BZ #19129]
* sysdeps/arm/dl-tlsdesc.S (_dl_tlsdesc_resolve_hold): Save and restore
r0 and r1.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 ++++++
NEWS | 2 +-
sysdeps/arm/dl-tlsdesc.S | 27 ++++++++++++++++++---------
3 files changed, 25 insertions(+), 10 deletions(-)
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2015-06-22 11:27 [Bug libc/18572] New: [arm] Lazy TLSDESC relocation has data race nszabolcs at gmail dot com
2015-08-22 21:35 ` [Bug dynamic-link/18572] " jsm28 at gcc dot gnu.org
2015-10-14 16:02 ` cvs-commit at gcc dot gnu.org
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