From fd7e0c02e272913a0a8b6d492c7260dfca0b1408 Mon Sep 17 00:00:00 2001 From: Tim Kientzle Date: Sat, 14 May 2016 12:37:37 -0700 Subject: [PATCH] Reject cpio symlinks that exceed 1MB --- libarchive/archive_read_support_format_cpio.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libarchive/archive_read_support_format_cpio.c b/libarchive/archive_read_support_format_cpio.c index c2ca85b..b09db0e 100644 --- a/libarchive/archive_read_support_format_cpio.c +++ b/libarchive/archive_read_support_format_cpio.c @@ -401,6 +401,11 @@ archive_read_format_cpio_read_header(struct archive_read *a, /* If this is a symlink, read the link contents. */ if (archive_entry_filetype(entry) == AE_IFLNK) { + if (cpio->entry_bytes_remaining > 1024 * 1024) { + archive_set_error(&a->archive, ENOMEM, + "Rejecting malformed cpio archive: symlink contents exceed 1 megabyte"); + return (ARCHIVE_FATAL); + } h = __archive_read_ahead(a, (size_t)cpio->entry_bytes_remaining, NULL); if (h == NULL) -- 2.7.4