[Bug libc/12159] strchr (x86-64/multiarch/SSE4.2) handles second parameter incorrectly.

[Bug libc/12159] strchr (x86-64/multiarch/SSE4.2) handles second parameter incorrectly.

[richardpku at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12159

--- Comment #1 from Richard Li <richardpku at gmail dot com> 2010-10-25 15:32:13 UTC ---
Created attachment 5084
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5084
A quick fix

This patch fixes the value of %xmm1 and the return value.

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[Bug libc/12159] New: strchr (x86-64/multiarch/SSE4.2) handles second parameter incorrectly.

[richardpku at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12159

           Summary: strchr (x86-64/multiarch/SSE4.2) handles second
                    parameter incorrectly.
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: richardpku@gmail.com


sysdeps/x86-64/multiarch/strchr.S (Both glibc-2.12.1 and latest git version):

If %rdi is aligned to a 16-byte boundary, the value of %xmm1 is not properly
set. The following program exposes this problem:


#include <stdio.h>
#include <string.h>
int main ()
{
    char s[] __attribute__((aligned(16))) = "\xff";
    printf ("%p\n", strchr (s, '\xfe'));
    return 0;
}


It is expected to output "(nil)", but it actually prints a valid pointer if run
on an x86-64 system with a multiarch-enabled glibc and a CPU which supports
SSE4.2.

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[Bug libc/12159] strchr (x86-64/multiarch/SSE4.2) handles second parameter incorrectly.

[drepper.fsp at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12159

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

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

--- Comment #2 from Ulrich Drepper <drepper.fsp at gmail dot com> 2010-10-25 20:02:45 UTC ---
Fixed in git.

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[Bug libc/12159] strchr (x86-64/multiarch/SSE4.2) handles second parameter incorrectly.

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12159

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

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