From: Hugh Dickins <hugh@veritas.com>
Date: Tue, 2 Aug 2005 04:11:42 +0000 (-0700)
Subject: [PATCH] x86_64: access of some bad address
X-Git-Tag: v2.6.13-rc5~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=690dbe1ced143876d8fa56b72310738dbe079d0a;p=pandora-kernel.git

[PATCH] x86_64: access of some bad address

x86_64 has a large sparse gate area between VSYSCALL_START and
VSYSCALL_END, not all of it presently backed by pmds.  Alexander Nyberg has
found that in some circumstances gdb may try to ptrace here, and hit
get_user_pages BUG_ON.  It seems odd that gdb should be accessing here, but
it certainly shouldn't crash in this way: relax BUG_ON to -EFAULT.  Fixes
kernel bugzilla #4801.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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