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* [Bug libc/13583] New: AVX check not done correctly for strcasecmp
@ 2012-01-11 14:13 delroth at gmail dot com
2012-01-11 21:11 ` [Bug libc/13583] " allan at archlinux dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: delroth at gmail dot com @ 2012-01-11 14:13 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13583
Bug #: 13583
Summary: AVX check not done correctly for strcasecmp
Product: glibc
Version: 2.15
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper.fsp@gmail.com
ReportedBy: delroth@gmail.com
Classification: Unclassified
According to Intel manuals, checking for AVX has to be done by checking AVX and
OS XSAVE support in CPUID + XFEATURE_ENABLED_MASK via xgetbv. However, for
strcasecmp, AVX is checked by testing the AVX bit in the cpuid.
This makes systems using glibc-2.15 unbootable under current versions of Xen
when the CPU supports AVX because Xen does not have XSAVE support. On these
systems, strcasecmp fails with a SIGILL when executing vmovdqa.
Bad check is here:
http://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86_64/multiarch/strcmp.S;h=f93c83d7d469085029018dcf0d7f2eaadb05a44f;hb=HEAD#l108
Example of a good check:
http://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86_64/dl-trampoline.S;h=6523c92945a59e6a5eefa3cfb2e0c58dfa99fd44;hb=HEAD#l137
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^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com @ 2012-01-11 21:11 ` allan at archlinux dot org 2012-01-26 12:46 ` drepper.fsp at gmail dot com ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: allan at archlinux dot org @ 2012-01-11 21:11 UTC (permalink / raw) To: glibc-bugs http://sourceware.org/bugzilla/show_bug.cgi?id=13583 Allan McRae <allan at archlinux dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |allan at archlinux dot org -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com 2012-01-11 21:11 ` [Bug libc/13583] " allan at archlinux dot org @ 2012-01-26 12:46 ` drepper.fsp at gmail dot com 2012-01-26 14:48 ` drepper.fsp at gmail dot com ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: drepper.fsp at gmail dot com @ 2012-01-26 12:46 UTC (permalink / raw) To: glibc-bugs http://sourceware.org/bugzilla/show_bug.cgi?id=13583 Ulrich Drepper <drepper.fsp at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #1 from Ulrich Drepper <drepper.fsp at gmail dot com> 2012-01-26 12:46:20 UTC --- I checked in a patch. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com 2012-01-11 21:11 ` [Bug libc/13583] " allan at archlinux dot org 2012-01-26 12:46 ` drepper.fsp at gmail dot com @ 2012-01-26 14:48 ` drepper.fsp at gmail dot com 2014-02-16 17:51 ` jackie.rosen at hushmail dot com ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: drepper.fsp at gmail dot com @ 2012-01-26 14:48 UTC (permalink / raw) To: glibc-bugs http://sourceware.org/bugzilla/show_bug.cgi?id=13583 --- Comment #2 from Ulrich Drepper <drepper.fsp at gmail dot com> 2012-01-26 14:48:35 UTC --- Actually, strcmp cannot have problems since the code only uses the AVX instruction encoding, not the YMM registers. Therefore any problem in that area must have a completely different reason. There is code which potentially uses the YMM registers and I added protection there. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com ` (2 preceding siblings ...) 2012-01-26 14:48 ` drepper.fsp at gmail dot com @ 2014-02-16 17:51 ` jackie.rosen at hushmail dot com 2014-05-28 19:43 ` schwab at sourceware dot org 2014-06-27 11:13 ` fweimer at redhat dot com 5 siblings, 0 replies; 7+ messages in thread From: jackie.rosen at hushmail dot com @ 2014-02-16 17:51 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=13583 Jackie Rosen <jackie.rosen at hushmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jackie.rosen at hushmail dot com --- Comment #3 from Jackie Rosen <jackie.rosen at hushmail dot com> --- *** Bug 260998 has been marked as a duplicate of this bug. *** Seen from the domain http://volichat.com Page where seen: http://volichat.com/adult-chat-rooms Marked for reference. Resolved as fixed @bugzilla. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com ` (3 preceding siblings ...) 2014-02-16 17:51 ` jackie.rosen at hushmail dot com @ 2014-05-28 19:43 ` schwab at sourceware dot org 2014-06-27 11:13 ` fweimer at redhat dot com 5 siblings, 0 replies; 7+ messages in thread From: schwab at sourceware dot org @ 2014-05-28 19:43 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=13583 Andreas Schwab <schwab at sourceware dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC|jackie.rosen at hushmail dot com | -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libc/13583] AVX check not done correctly for strcasecmp 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com ` (4 preceding siblings ...) 2014-05-28 19:43 ` schwab at sourceware dot org @ 2014-06-27 11:13 ` fweimer at redhat dot com 5 siblings, 0 replies; 7+ messages in thread From: fweimer at redhat dot com @ 2014-06-27 11:13 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=13583 Florian Weimer <fweimer at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Flags| |security- -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-06-27 11:13 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-01-11 14:13 [Bug libc/13583] New: AVX check not done correctly for strcasecmp delroth at gmail dot com 2012-01-11 21:11 ` [Bug libc/13583] " allan at archlinux dot org 2012-01-26 12:46 ` drepper.fsp at gmail dot com 2012-01-26 14:48 ` drepper.fsp at gmail dot com 2014-02-16 17:51 ` jackie.rosen at hushmail dot com 2014-05-28 19:43 ` schwab at sourceware dot org 2014-06-27 11:13 ` fweimer at redhat dot com
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