[Bug libc/12205] New: Bad x86-64 strncasecmp on Intel Core i7

[Bug libc/12205] New: Bad x86-64 strncasecmp on Intel Core i7

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12205

           Summary: Bad x86-64 strncasecmp on Intel Core i7
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: hjl.tools@gmail.com


(gdb) p cp + 1
$78 = 0x749ffa "gottpoff"
(gdb) p gotrel[j].str
$79 = 0x505cbe "GOTPLT"
(gdb) p len
$80 = 6
(gdb) call strncasecmp (cp + 1, gotrel[j].str, gotrel[j].len)
$81 = 0
(gdb)

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[Bug libc/12205] Bad x86-64 strncasecmp on Intel Core i7

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12205

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-11-10 00:05:34 UTC ---
[hjl@gnu-35 junk-1]$ cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static char cp [4096+16] __attribute__ ((aligned(4096)));
static char gotrel[4096] __attribute__ ((aligned(4096)));

int
main ()
{
  char *p = cp + 0xffa;
  char *g = gotrel + 0xcbe;
  strcpy (p, "gottpoff");
  strcpy (g, "GOTPLT");
  printf ("%p: %s\n", p, p);
  printf ("%p: %s\n", g, g);
  if (strncasecmp (p, g, 6) <= 0)
    abort ();
  return 0;
}
[hjl@gnu-35 junk-1]$ make
cc     test.c   -o test
./test
0x602ffa: gottpoff
0x604cbe: GOTPLT
make: *** [all] Aborted
[hjl@gnu-35 junk-1]$

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[Bug libc/12205] Bad x86-64 strncasecmp on Intel Core i7

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12205

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2010-11-10 02:04:22 UTC ---
Created attachment 5118
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5118
A patch

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[Bug libc/12205] Bad x86-64 strncasecmp on Intel Core i7

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12205

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |http://sourceware.org/ml/li
                   |                            |bc-alpha/2010-11/msg00031.h
                   |                            |tml

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2010-11-10 03:41:31 UTC ---
A patch is at

http://sourceware.org/ml/libc-alpha/2010-11/msg00031.html

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[Bug libc/12205] Bad x86-64 strncasecmp on Intel Core i7

[drepper.fsp at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12205

Ulrich Drepper <drepper.fsp at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Ulrich Drepper <drepper.fsp at gmail dot com> 2010-11-10 08:06:44 UTC ---
 Patch is in git.

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[Bug libc/12205] Bad x86-64 strncasecmp on Intel Core i7

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12205

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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