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Red Hat Bugzilla – Attachment 297943 Details for
Bug 437312
CVE-2008-1367 Kernel doesn't clear DF for signal handlers
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Testcase for finding out the value of the DF flag.
df_flag_test.c (text/x-csrc), 679 bytes, created by
Jan Lieskovsky
on 2008-03-13 15:05:53 UTC
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Description:
Testcase for finding out the value of the DF flag.
Filename:
MIME Type:
Creator:
Jan Lieskovsky
Created:
2008-03-13 15:05:53 UTC
Size:
679 bytes
patch
obsolete
>/* Gcc-4.3+ kernel DF flag related reproducer */ >/* Compile with: > > cc -m{32,64} df_flag_test.c -o df_flag_test > > based on which architecture do you use. > >*/ > >#include <stdint.h> >#include <stdlib.h> >#include <stdio.h> >#include <signal.h> > >void handler(int signal) { > unsigned long rflags; > >#ifdef __x86_64__ > asm volatile("pushfq ; popq %0" : "=g" (rflags)); >#else > asm volatile("pushf; popl %0" : "=g" (rflags)); >#endif > >if (rflags & (1 << 10)) > printf("DF = 1\n"); >else > printf("DF = 0\n"); > >} > >int main() { > signal(SIGUSR1, handler); > > while(1) > { > asm volatile("std\r\n"); > } > > return 0; >} >
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