Messages in this thread | | | From | Manuel Arostegui Ramirez <> | Subject | Re: Local DoS attack on i386 (was: new kernel bug) | Date | Mon, 14 Jun 2004 16:59:37 +0200 |
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El Lunes 14 Junio 2004 16:20, Nuno Monteiro escribió: > On 2004.06.14 14:58, Gianni Tedesco wrote: > > On Sat, 2004-06-12 at 11:59 +0200, Manuel Arostegui Ramirez wrote: > > > Somebody know a patch to solved this new bug? > > > http://reviewed.homelinux.org/news/2004-06-11_kernel_crash/index.html.e > > >n Affected versions: > > > * Linux 2.6.x > > > o Linux 2.6.7-rc2 > > > o Linux 2.6.6 (all versions) > > > o Linux 2.6.6 SMP (verified by riven) > > > o Linux 2.6.5-gentoo (verified by RatiX) > > > o Linux 2.6.5-mm6 - (verified by Mariux) > > > * Linux 2.4.2x > > > o Linux 2.4.26 vanilla > > > o Linux 2.4.26-rc1 vanilla > > > o Linux 2.4.26-gentoo-r1 > > > o Linux 2.4.22 > > > > Seems to be a scheduler race or something? > > This was already fixed in 2.6, see > http://linux.bkbits.net:8080/linux-2.5/diffs/include/asm-i386/i387.h@1.16?n >av=index.html|src/.|src/include|src/include/asm-i386|hist/include/asm-i386/i >387.h > > > The same fix should be applied to 2.4. I'm running locally a very > hacked version of 2.4.22 with it and it survives that crash.c program. > > Here's the diff. Marcelo, please merge. > > > --- > linux-2.4.27-pre5/include/asm-i386/i387.h~fix-x86-clear_fpu-macro 2004-06-1 >4 15:12:13.909059344 +0100 +++ > linux-2.4.27-pre5/include/asm-i386/i387.h 2004-06-14 15:12:45.970185312 > +0100 @@ -34,7 +34,7 @@ extern void kernel_fpu_begin(void); > > #define clear_fpu( tsk ) do { \ > if ( tsk->flags & PF_USEDFPU ) { \ > - asm volatile("fwait"); \ > + asm volatile("fnclex ; fwait"); \ > tsk->flags &= ~PF_USEDFPU; \ > stts(); \ > } \ > -
This diff fixed the bug in 2.4.X? Thanks, Nuno, I'm going to apply it. Best Regards
-- Manuel Arostegui Ramirez #Linux Registered User 200896
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