On Sun, 17 Sep 2006 23:51:45 -0400
Chuck Ebbert <[email protected]> wrote:
> In-Reply-To: <[email protected]>
>
> On Sun, 17 Sep 2006 19:08:24 -0400, "In Cognito" wrote:
>
> > Here's a way to heat up your cpu and crash the rest of the system too:
> >
> > main(){
> > asm("pushf\n"
> > "popl %eax\n"
> > /* enable the NT bit */
> > "orl $0x4000, %eax\n"
> > "pushl %eax\n"
> > "popf\n"
> >
> > "sysenter\n"
> > );
> > return 0;
> > }
>
> I'll take your word that it crashes.
It doesn't for me - I get a segfault.
That's on a PIII. Are recenter CPUs different in this regard?
> 2.6.9 is fine. I'd guess the iret fixups from 2.6.12 are the problem.
>
> This doesn't crash for me, but it's probably not quite the right fix:
>
> Signed-off-by: Chuck Ebbert <[email protected]>
> ---
> arch/i386/kernel/traps.c | 12 +++++++++++-
> 1 files changed, 11 insertions(+), 1 deletion(-)
>
> --- 2.6.18-rc6-nb.orig/arch/i386/kernel/traps.c
> +++ 2.6.18-rc6-nb/arch/i386/kernel/traps.c
> @@ -516,6 +516,16 @@ fastcall void do_##name(struct pt_regs *
> do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \
> }
>
> +#define DO_TSS_ERROR(trapnr, signr, str, name) \
> +fastcall void do_##name(struct pt_regs * regs, long error_code) \
> +{ \
> + if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
> + == NOTIFY_STOP) \
> + return; \
> + regs->eflags &= ~X86_EFLAGS_NT; \
> + do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \
> +}
> +
> #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
> fastcall void do_##name(struct pt_regs * regs, long error_code) \
> { \
> @@ -561,7 +571,7 @@ DO_VM86_ERROR( 4, SIGSEGV, "overflow", o
> DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds)
> DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->eip)
> DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
> -DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
> +DO_TSS_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
> DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
> DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
> DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
> --
> Chuck
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
