From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Drokin <green@linuxhacker.ru>,
"<linux-kernel@vger.kernel.org> Mailing List"
<linux-kernel@vger.kernel.org>,
"<linux-fsdevel@vger.kernel.org>" <linux-fsdevel@vger.kernel.org>
Subject: Re: Dcache oops
Date: Fri, 3 Jun 2016 22:26:52 +0100 [thread overview]
Message-ID: <20160603212652.GT14480@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CA+55aFznPit97evuwZHdCG55=N0QbkFSST2ydKxvExQTR-YXTg@mail.gmail.com>
On Fri, Jun 03, 2016 at 02:18:15PM -0700, Linus Torvalds wrote:
> So something must have corrupted the qstr.
>
> The remaining length *should* in %edi, judging by the
>
> 0xffffffff81243b82 <+306>: cmp $0x7,%edi
>
> in the __d_lookup() disassembly. And %rdi contains 2, so there were
> supposed to be two more characters at 'ct' (which is %rdx).
... and since r8 and rsi are 0, we couldn't have consumed anything.
>
> Why would nd->last.name be bogus? I don't see anything.
An interesting part is that it's page-aligned. Which is impossible for
a short name obtained by getname(), but is quite likely for a symlink body.
So at a guess, we have a page containing a symlink body freed under us.
next prev parent reply other threads:[~2016-06-03 21:26 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-02 22:46 NFS/d_splice_alias breakage Oleg Drokin
2016-06-02 23:59 ` [PATCH] Allow d_splice_alias to accept hashed dentries green
2016-06-03 0:25 ` Oleg Drokin
2016-06-03 0:44 ` NFS/d_splice_alias breakage Trond Myklebust
2016-06-03 0:44 ` Trond Myklebust
2016-06-03 0:54 ` Oleg Drokin
2016-06-03 0:54 ` Oleg Drokin
2016-06-03 3:26 ` Al Viro
2016-06-03 3:38 ` Al Viro
2016-06-03 3:28 ` Al Viro
2016-06-03 3:37 ` Al Viro
2016-06-03 3:43 ` Oleg Drokin
2016-06-03 4:26 ` Al Viro
2016-06-03 4:42 ` Al Viro
2016-06-03 4:53 ` Al Viro
2016-06-03 4:58 ` Oleg Drokin
2016-06-03 5:56 ` Al Viro
2016-06-06 23:36 ` Oleg Drokin
2016-06-10 1:33 ` Oleg Drokin
2016-06-10 16:49 ` Oleg Drokin
2016-06-20 13:25 ` Oleg Drokin
2016-06-20 14:08 ` Al Viro
2016-06-20 14:54 ` Trond Myklebust
2016-06-20 14:54 ` Trond Myklebust
2016-06-20 15:28 ` Al Viro
2016-06-20 15:43 ` Anna Schumaker
2016-06-20 15:45 ` Oleg Drokin
2016-06-20 15:47 ` Trond Myklebust
2016-06-20 15:47 ` Trond Myklebust
2016-06-03 16:38 ` Dcache oops Oleg Drokin
2016-06-03 18:22 ` Al Viro
2016-06-03 18:35 ` Oleg Drokin
2016-06-03 20:07 ` Al Viro
2016-06-03 21:17 ` Oleg Drokin
2016-06-03 21:46 ` Al Viro
2016-06-03 22:17 ` Al Viro
2016-06-03 21:18 ` Linus Torvalds
2016-06-03 21:26 ` Al Viro [this message]
2016-06-03 22:00 ` Linus Torvalds
2016-06-03 22:23 ` Al Viro
2016-06-03 22:29 ` Al Viro
2016-06-03 22:36 ` Linus Torvalds
2016-06-03 22:42 ` Oleg Drokin
2016-06-03 22:43 ` Al Viro
2016-06-03 22:37 ` Al Viro
2016-06-03 22:49 ` Oleg Drokin
2016-06-03 23:58 ` Oleg Drokin
2016-06-04 0:56 ` Al Viro
2016-06-04 12:25 ` Jeff Layton
2016-06-04 16:12 ` Oleg Drokin
2016-06-04 16:21 ` [PATCH] nfs4: Fix potential use after free of state in nfs4_do_reclaim green
2016-06-04 19:57 ` Jeff Layton
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