3.13.11-ckt22 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Jan Kara <[email protected]> commit 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 upstream. Check length of extended attributes and allocation descriptors when loading inodes from disk. Otherwise corrupted filesystems could confuse the code and make the kernel oops. Reported-by: Carl Henrik Lunde <[email protected]> Signed-off-by: Jan Kara <[email protected]> Reference: CVE-2015-4167 BugLink: https://bugs.launchpad.net/bugs/1462173 [ luis: used Ben's backport to 3.16: - use make_bad_inode() instead of returning error ] Signed-off-by: Luis Henriques <[email protected]> Signed-off-by: Kamal Mostafa <[email protected]> --- fs/udf/inode.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 8aa2b1b..cfdbbfd 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1480,6 +1480,19 @@ reread: iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); } + /* + * Sanity check length of allocation descriptors and extended attrs to + * avoid integer overflows + */ + if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs) { + make_bad_inode(inode); + return; + } + /* Now do exact checks */ + if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs) { + make_bad_inode(inode); + return; + } /* Sanity checks for files in ICB so that we don't get confused later */ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { /* -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
