lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 6 Nov 2014 13:41:53 +0800 From: Minfei Huang <mnfhuang@...il.com> To: tglx@...utronix.de, mingo@...hat.com Cc: x86@...nel.org, linux-kernel@...r.kernel.org, Minfei Huang <mnfhuang@...il.com> Subject: [PATCH] x86/mm: Give the correct initail value to the pmd_idx The variable value is undefined from the stack eara. So it makes sense to init the variable to run process correctly. If the variable pmd_idx inits the value more than PTRS_PER_PMD, the count may be smaller than the correct value, and the allocated page may be not enough for pte entry. The kernel may panic cause by the undefine variable which is allocated from stack. Signed-off-by: Minfei Huang <mnfhuang@...il.com> --- arch/x86/mm/init_32.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index c8140e1..c23ab1e 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -137,6 +137,7 @@ page_table_range_init_count(unsigned long start, unsigned long end) vaddr = start; pgd_idx = pgd_index(vaddr); + pmd_idx = pmd_index(vaddr); for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) { for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists