Messages in this thread Patch in this message | | | Date | Tue, 20 Feb 2007 17:50:28 -0800 | From | Greg KH <> | Subject | [patch 08/18] hfs_fill_super returns success even if no root inode (CVE-2006-6056) |
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-stable review patch. If anyone has any objections, please let us know.
------------------ From: Eric Sandeen <sandeen@redhat.com>
http://kernelfun.blogspot.com/2006/11/mokb-14-11-2006-linux-26x-selinux.html
mount that image... fs: filesystem was not cleanly unmounted, running fsck.hfs is recommended. mounting read-only. hfs: get root inode failed. BUG: unable to handle kernel NULL pointer dereference at virtual address 00000018 printing eip ... EIP is at superblock_doinit+0x21/0x767 ... [] selinux_sb_kern_mount+0xc/0x4b [] vfs_kern_mount+0x99/0xf6 [] do_kern_mount+0x2d/0x3e [] do_mount+0x5fa/0x66d [] sys_mount+0x77/0xae [] syscall_call+0x7/0xb DWARF2 unwinder stuck at syscall_call+0x7/0xb
hfs_fill_super() returns success even if root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); or sb->s_root = d_alloc_root(root_inode);
fails. This superblock finds its way to superblock_doinit() which does:
struct dentry *root = sb->s_root; struct inode *inode = root->d_inode;
and boom. Need to make sure the error cases return an error, I think.
[akpm@osdl.org: return -ENOMEM on oom] Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- Date: Thu, 16 Nov 2006 09:19:22 +0000 (-0800) Subject: [patch 08/18] [PATCH] hfs_fill_super returns success even if no root inode X-Git-Tag: v2.6.19 X-Git-Url: http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d6ddf55440833fd9404138026af246c51ebeef22
fs/hfs/super.c | 2 ++ 1 file changed, 2 insertions(+)
--- linux-2.6.18.7.orig/fs/hfs/super.c +++ linux-2.6.18.7/fs/hfs/super.c @@ -391,11 +391,13 @@ static int hfs_fill_super(struct super_b hfs_find_exit(&fd); goto bail_no_root; } + res = -EINVAL; root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); hfs_find_exit(&fd); if (!root_inode) goto bail_no_root; + res = -ENOMEM; sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) goto bail_iput; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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