From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DBC1033A6F9; Sat, 28 Mar 2026 04:25:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774671947; cv=none; b=G85w/PypVh/FIWzP/TarNTLJ45Sw3c1zXmPAAd5L8SgmTxWQcEQd+UXWLXY9Y9G26jLTqr48PSXCoFIThoxhZZdQdxeRMKbldVULUXfEJQNFFL93VxSm+uxOqXU8TechWnVHEKgzL8wT8H4qXb+Qp950TV8i3JjMc/ExnWiUTeM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774671947; c=relaxed/simple; bh=4vTYs+xQAUuGk4y8NNmd9eqztVFDT26xA77hTWq7WQg=; h=Date:To:From:Subject:Message-Id; b=tpcPZ/7MIb91CtOxiwXH8j0yocuqLmv3NSpvTGdVlU3zMLRwmrW6tcmFKoDN6TT+tK7vfbDJFxnrkg+FWkKhHkc9D3pPq0kh8U5xCw4hEpjYspP6MLJ+ghB396VnsNz/O7h9VoeGSTP0zgXY2F3njgVA8O5jd0Mh8kVxj9HXL5E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=bCxsZUEI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="bCxsZUEI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B38A5C4CEF7; Sat, 28 Mar 2026 04:25:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774671947; bh=4vTYs+xQAUuGk4y8NNmd9eqztVFDT26xA77hTWq7WQg=; h=Date:To:From:Subject:From; b=bCxsZUEIp/Tl7V+yJqOnoyk4I2FDNZFUoLmum1OwgPu1AnNQYT9injCpBJ6YanI8+ sXffWBFSihDQ4NefDaX8w4qax1DCDw0VT7H0nKBjeeRWOxqTmyJCtXikYXWQfqbPwC ruH3ltcqMXlQLL02y9pDQ/rUxcRbdsSmUJWRBekM= Date: Fri, 27 Mar 2026 21:25:47 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,akpm@linux-foundation.org,objecting@objecting.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-nonmm-stable] lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch removed from -mm tree Message-Id: <20260328042547.B38A5C4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: lib/ts_kmp: fix integer overflow in pattern length calculation has been removed from the -mm tree. Its filename was lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch This patch was dropped because it was merged into the mm-nonmm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Josh Law Subject: lib/ts_kmp: fix integer overflow in pattern length calculation Date: Sun, 8 Mar 2026 20:20:28 +0000 The ts_kmp algorithm stores its prefix_tbl[] table and pattern in a single allocation sized from the pattern length. If the prefix_tbl[] size calculation wraps, the resulting allocation can be too small and subsequent pattern copies can overflow it. Fix this by rejecting zero-length patterns and by using overflow helpers before calculating the combined allocation size. This fixes a potential heap overflow. The pattern length calculation can wrap during a size_t addition, leading to an undersized allocation. Because the textsearch library is reachable from userspace via Netfilter's xt_string module, this is a security risk that should be backported to LTS kernels. Link: https://lkml.kernel.org/r/20260308202028.2889285-2-objecting@objecting.org Signed-off-by: Josh Law Reviewed-by: Andrew Morton Cc: Signed-off-by: Andrew Morton --- lib/ts_kmp.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) --- a/lib/ts_kmp.c~lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation +++ a/lib/ts_kmp.c @@ -94,8 +94,22 @@ static struct ts_config *kmp_init(const struct ts_config *conf; struct ts_kmp *kmp; int i; - unsigned int prefix_tbl_len = len * sizeof(unsigned int); - size_t priv_size = sizeof(*kmp) + len + prefix_tbl_len; + unsigned int prefix_tbl_len; + size_t priv_size; + + /* Zero-length patterns would make kmp_find() read beyond kmp->pattern. */ + if (unlikely(!len)) + return ERR_PTR(-EINVAL); + + /* + * kmp->pattern is stored immediately after the prefix_tbl[] table. + * Reject lengths that would wrap while sizing either region. + */ + if (unlikely(check_mul_overflow(len, sizeof(*kmp->prefix_tbl), + &prefix_tbl_len) || + check_add_overflow(sizeof(*kmp), (size_t)len, &priv_size) || + check_add_overflow(priv_size, prefix_tbl_len, &priv_size))) + return ERR_PTR(-EINVAL); conf = alloc_ts_config(priv_size, gfp_mask); if (IS_ERR(conf)) _ Patches currently in -mm which might be from objecting@objecting.org are mm-damon-core-document-damos_commit_dests-failure-semantics.patch lib-maple_tree-fix-swapped-arguments-in-mas_safe_pivot-call.patch lib-idr-fix-ida_find_first_range-missing-ids-across-chunk-boundaries.patch