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 9987428314A; Tue, 26 Aug 2025 13:44:46 +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=1756215886; cv=none; b=B7Oa9Peu+1IqY1NQgEDlUg0bQKQGoy8eTR6Y3gvNkkofdZ46tPjalSKzyLKwE1AsiIF/0GaZ0+ANIA9zyk5HCx9c1rc7hODMmWLnVHqL43v6mHJzX6XyOdZk2Lz1wroRbvsILPD+XERZAXL63jR2RzdpwOqkTmFQItq3goxWqhU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756215886; c=relaxed/simple; bh=Yz94jz0/0Hbs/tuoX7BIsALLuN1RKTkwhlAlzHScjSE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ioHl6QKaxOaCF/Ba/grNuV0CvDJ1pFET8gjAjApxJh99q75AZnVtuF1O7axjihsAhRmqtZ/1770/+uDwEg0N7QUHDZAHxY/lSLpUGWF9+JqwvUH9nt/veVm8G5aq9p+03euxg+TB1IZbyU4QMfqF2QrHDmRv8JWvVW0+ptfKoME= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=neppza1o; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="neppza1o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2ED46C116B1; Tue, 26 Aug 2025 13:44:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756215886; bh=Yz94jz0/0Hbs/tuoX7BIsALLuN1RKTkwhlAlzHScjSE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=neppza1o0AFAehAcE8ZFwzJzuP+Sp2owhPWcLbr1W0LEBvpYOdRW7KIR50aN3GDr2 0ocz+o5NMrE3Esw198YXC0JaGlxzec9H1AwHMuFj9sBHIR3hss6GeHQ889kbNBTy17 TTT8kTNCC/e0Vol83dUqFcCtuxMdSJ6MRymqS6gw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ryan Lee , John Johansen , Sasha Levin Subject: [PATCH 5.15 204/644] apparmor: ensure WB_HISTORY_SIZE value is a power of 2 Date: Tue, 26 Aug 2025 13:04:55 +0200 Message-ID: <20250826110951.489793478@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110946.507083938@linuxfoundation.org> References: <20250826110946.507083938@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ryan Lee [ Upstream commit 6c055e62560b958354625604293652753d82bcae ] WB_HISTORY_SIZE was defined to be a value not a power of 2, despite a comment in the declaration of struct match_workbuf stating it is and a modular arithmetic usage in the inc_wb_pos macro assuming that it is. Bump WB_HISTORY_SIZE's value up to 32 and add a BUILD_BUG_ON_NOT_POWER_OF_2 line to ensure that any future changes to the value of WB_HISTORY_SIZE respect this requirement. Fixes: 136db994852a ("apparmor: increase left match history buffer size") Signed-off-by: Ryan Lee Signed-off-by: John Johansen Signed-off-by: Sasha Levin --- security/apparmor/include/match.h | 3 ++- security/apparmor/match.c | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h index 884489590588..29306ec87fd1 100644 --- a/security/apparmor/include/match.h +++ b/security/apparmor/include/match.h @@ -141,7 +141,8 @@ unsigned int aa_dfa_matchn_until(struct aa_dfa *dfa, unsigned int start, void aa_dfa_free_kref(struct kref *kref); -#define WB_HISTORY_SIZE 24 +/* This needs to be a power of 2 */ +#define WB_HISTORY_SIZE 32 struct match_workbuf { unsigned int count; unsigned int pos; diff --git a/security/apparmor/match.c b/security/apparmor/match.c index 3e9e1eaf990e..0e683ee323e3 100644 --- a/security/apparmor/match.c +++ b/security/apparmor/match.c @@ -672,6 +672,7 @@ unsigned int aa_dfa_matchn_until(struct aa_dfa *dfa, unsigned int start, #define inc_wb_pos(wb) \ do { \ + BUILD_BUG_ON_NOT_POWER_OF_2(WB_HISTORY_SIZE); \ wb->pos = (wb->pos + 1) & (WB_HISTORY_SIZE - 1); \ wb->len = (wb->len + 1) & (WB_HISTORY_SIZE - 1); \ } while (0) -- 2.39.5