[kernel/f16] Add patch to fix XFS memory corruption (rhbz 749166)

[Josh Boyer]

commit 0e7a7173052c1e44eca3020e22efbf62ce5f8b86
Author: Josh Boyer <jwboyer at redhat.com>
Date:   Wed Oct 26 09:18:09 2011 -0400

    Add patch to fix XFS memory corruption (rhbz 749166)

 kernel.spec                                        |    9 ++-
 ...ossible-memory-corruption-in-xfs_readlink.patch |   77 ++++++++++++++++++++
 2 files changed, 85 insertions(+), 1 deletions(-)
---
diff --git a/kernel.spec b/kernel.spec
index f6f27d5..f1729ee 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -51,7 +51,7 @@ Summary: The Linux kernel
 # For non-released -rc kernels, this will be prepended with "0.", so
 # for example a 3 here will become 0.3
 #
-%global baserelease 3
+%global baserelease 4
 %global fedora_build %{baserelease}
 
 # base_sublevel is the kernel version we're starting with and patching
@@ -760,6 +760,9 @@ Patch21021: 0002-mm-Abort-reclaim-compaction-if-compaction-can-procee.patch
 Patch21030: be2net-non-member-vlan-pkts-not-received-in-promisco.patch
 Patch21031: benet-remove-bogus-unlikely-on-vlan-check.patch
 
+#rhbz 749166
+Patch21050: xfs-Fix-possible-memory-corruption-in-xfs_readlink.patch
+
 %endif
 
 BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@@ -1255,6 +1258,7 @@ ApplyPatch linux-2.6-i386-nx-emulation.patch
 # ext4
 
 # xfs
+ApplyPatch xfs-Fix-possible-memory-corruption-in-xfs_readlink.patch
 
 # btrfs
 
@@ -2103,6 +2107,9 @@ fi
 # and build.
 
 %changelog
+* Wed Oct 26 2011 Josh Boyer <jwboyer at redhat.com>
+- Add patch to fix XFS memory corruption (rhbz 749166)
+
 * Tue Oct 25 2011 Josh Boyer <jwboyer at redhat.com>
 - CVE-2011-3347: be2net: promiscuous mode and non-member VLAN packets DoS (rhbz 748691)
 - CVE-2011-1083: excessive in kernel CPU consumption when creating large nested epoll structures (rhbz 748668)
diff --git a/xfs-Fix-possible-memory-corruption-in-xfs_readlink.patch b/xfs-Fix-possible-memory-corruption-in-xfs_readlink.patch
new file mode 100644
index 0000000..9e810db
--- /dev/null
+++ b/xfs-Fix-possible-memory-corruption-in-xfs_readlink.patch
@@ -0,0 +1,77 @@
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+From: Carlos Maiolino <cmaiolino at redhat.com>
+To: xfs at oss.sgi.com
+Cc: Carlos Maiolino <cmaiolino at redhat.com>
+X-ASG-Orig-Subj: [PATCH] Fix possible memory corruption in xfs_readlink
+Subject: [PATCH] Fix possible memory corruption in xfs_readlink
+Date: Tue, 18 Oct 2011 02:18:58 -0200
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+
+Fixes a possible memory corruption when the link is larger than
+MAXPATHLEN and XFS_DEBUG is not enabled. This also remove the
+S_ISLNK assert, since the inode mode is checked previously in
+xfs_readlink_by_handle() and via VFS.
+
+Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
+---
+ fs/xfs/xfs_vnodeops.c |   11 ++++++++---
+ 1 files changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
+index 51fc429..c3288be 100644
+--- a/fs/xfs/xfs_vnodeops.c
++++ b/fs/xfs/xfs_vnodeops.c
+@@ -123,13 +123,18 @@ xfs_readlink(
+ 
+ 	xfs_ilock(ip, XFS_ILOCK_SHARED);
+ 
+-	ASSERT(S_ISLNK(ip->i_d.di_mode));
+-	ASSERT(ip->i_d.di_size <= MAXPATHLEN);
+-
+ 	pathlen = ip->i_d.di_size;
+ 	if (!pathlen)
+ 		goto out;
+ 
++	if (pathlen > MAXPATHLEN) {
++		xfs_alert(mp, "%s: inode (%llu) symlink length (%d) too long",
++			 __func__, (unsigned long long)ip->i_ino, pathlen);
++		ASSERT(0);
++		return XFS_ERROR(EFSCORRUPTED);
++	}
++
++
+ 	if (ip->i_df.if_flags & XFS_IFINLINE) {
+ 		memcpy(link, ip->i_df.if_u1.if_data, pathlen);
+ 		link[pathlen] = '\0';
+-- 
+1.7.6.2
+