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: Fri, 18 Mar 2011 10:19:08 +0800 From: Shaohua Li <shaohua.li@...el.com> To: Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org> Cc: lkml <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>, "y-goto@...fujitsu.com" <y-goto@...fujitsu.com>, "Mallick, Asit K" <asit.k.mallick@...el.com> Subject: Re: [PATCH]x86: flush tlb if PGD entry is changed in i386 PAE mode On Wed, 2011-03-16 at 21:03 +0800, Rik van Riel wrote: > On 03/15/2011 11:37 PM, Shaohua Li wrote: > > According to intel CPU manual, every time PGD entry is changed in i386 PAE mode, > > we need do a full TLB flush. Current code follows this and there is comment > > for this too in the code. But current code misses the multi-threaded case. A > > changed page table might be used by several CPUs, every such CPU should flush > > TLB. > > Usually this isn't a problem, because we prepopulate all PGD entries at process > > fork. But when the process does munmap and follows new mmap, this issue will be > > triggered. When it happens, some CPUs will keep doing page fault. > > > > See: http://marc.info/?l=linux-kernel&m=129915020508238&w=2 > > > > Reported-by: Yasunori Goto<y-goto@...fujitsu.com> > > Signed-off-by: Shaohua Li<shaohua.li@...el.com> > > Tested-by: Yasunori Goto<y-goto@...fujitsu.com> > > Reviewed-by: Rik van Riel <riel@...hat.com> Ingo & akpm, can you pick this one? Thanks, Shaohua -- 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