Messages in this thread Patch in this message | | | Date | Wed, 18 Aug 2004 20:42:40 +0530 | From | Srivatsa Vaddagiri <> | Subject | [PATCH] ppc64: Fix v_regs pointer setup |
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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.
Following patch should fix it. Please review and apply:
Signed-off-by: Srivatsa Vaddagiri <vatsa@in.ibm.com>
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linux-2.6.8.1-vatsa/arch/ppc64/kernel/signal.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/ppc64/kernel/signal.c~signal_fix arch/ppc64/kernel/signal.c --- linux-2.6.8.1/arch/ppc64/kernel/signal.c~signal_fix 2004-08-18 20:30:23.000000000 +0530 +++ linux-2.6.8.1-vatsa/arch/ppc64/kernel/signal.c 2004-08-18 20:31:35.000000000 +0530 @@ -127,7 +127,7 @@ static long setup_sigcontext(struct sigc * 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 + 16) & ~0xful); #endif long err = 0; _
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Thanks and Regards, Srivatsa Vaddagiri, Linux Technology Center, IBM Software Labs, Bangalore, INDIA - 560017 - 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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