Messages in this thread Patch in this message | | | Date | Fri, 20 Aug 2004 16:59:51 +1000 | From | Paul Mackerras <> | Subject | Re: 2.6.8.1-mm2 |
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Srivatsa Vaddagiri writes:
> Paul rightly pointed out that is should be +15 and not +16. My mistake. > Updated ppc64-fix-v_regs-pointer-setup.patch below:
That patch applies on top of the previous one from Srivatsa. Here is a single patch that has the change we want against Linus' tree.
During some signal test, we found that v_regs pointer was not setup correctly. v_regs was made to point to itself, as a result of which the pointer was corrupted when vec registers were copied over. When the signal handler returned, restore_sigcontext tried derefering the invalid pointer and in the process killed the app with SIGSEGV.
Signed-off-by : Srivatsa Vaddagiri <vatsa@in.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
diff -urN linux-2.5/arch/ppc64/kernel/signal.c akpm/arch/ppc64/kernel/signal.c --- linux-2.5/arch/ppc64/kernel/signal.c 2004-06-18 19:06:50.000000000 +1000 +++ akpm/arch/ppc64/kernel/signal.c 2004-08-20 16:56:55.040912736 +1000 @@ -127,7 +127,7 @@ * v_regs pointer or not */ #ifdef CONFIG_ALTIVEC - elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve) & ~0xful); + elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful); #endif long err = 0; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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