From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27BB3C4332F for ; Fri, 11 Nov 2022 23:06:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231911AbiKKXGW (ORCPT ); Fri, 11 Nov 2022 18:06:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40406 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232825AbiKKXGV (ORCPT ); Fri, 11 Nov 2022 18:06:21 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98AE31004D; Fri, 11 Nov 2022 15:06:20 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 45784B8280A; Fri, 11 Nov 2022 23:06:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD8F4C433C1; Fri, 11 Nov 2022 23:06:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1668207977; bh=I5sTDCJvef0BymL8tvIOiXWjX/FhdAJjwLl+axc0AaA=; h=Date:To:From:Subject:From; b=cTUlG3RPjGHmaTIsR1ysBYAsLimMH+pYfbDH8rwuWa4ssWr4pg+z+RVUDzrogigzj ro6Rbrzt5CVGaWhEoIiWGT457ncrCmB7d32aSFksHdZJ03ii21xuMMj+RuGl/lpWda PLpF1COfkbai0aDaw1Je3PNdBU5BxPxgHDyiEUW8= Date: Fri, 11 Nov 2022 15:06:17 -0800 To: mm-commits@vger.kernel.org, trix@redhat.com, stable@vger.kernel.org, oberpar@linux.ibm.com, ndesaulniers@google.com, nathan@kernel.org, quic_mojha@quicinc.com, akpm@linux-foundation.org From: Andrew Morton Subject: + gcov-clang-fix-the-buffer-overflow-issue.patch added to mm-hotfixes-unstable branch Message-Id: <20221111230617.CD8F4C433C1@smtp.kernel.org> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch titled Subject: gcov: clang: fix the buffer overflow issue has been added to the -mm mm-hotfixes-unstable branch. Its filename is gcov-clang-fix-the-buffer-overflow-issue.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/gcov-clang-fix-the-buffer-overflow-issue.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Mukesh Ojha Subject: gcov: clang: fix the buffer overflow issue Date: Thu, 10 Nov 2022 00:31:37 +0530 Currently, in clang version of gcov code when module is getting removed gcov_info_add() incorrectly adds the sfn_ptr->counter to all the dst->functions and it result in the kernel panic in below crash report. Fix this by properly handling it. [ 8.899094][ T599] Unable to handle kernel write to read-only memory at virtual address ffffff80461cc000 [ 8.899100][ T599] Mem abort info: [ 8.899102][ T599] ESR = 0x9600004f [ 8.899103][ T599] EC = 0x25: DABT (current EL), IL = 32 bits [ 8.899105][ T599] SET = 0, FnV = 0 [ 8.899107][ T599] EA = 0, S1PTW = 0 [ 8.899108][ T599] FSC = 0x0f: level 3 permission fault [ 8.899110][ T599] Data abort info: [ 8.899111][ T599] ISV = 0, ISS = 0x0000004f [ 8.899113][ T599] CM = 0, WnR = 1 [ 8.899114][ T599] swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000ab8de000 [ 8.899116][ T599] [ffffff80461cc000] pgd=18000009ffcde003, p4d=18000009ffcde003, pud=18000009ffcde003, pmd=18000009ffcad003, pte=00600000c61cc787 [ 8.899124][ T599] Internal error: Oops: 9600004f [#1] PREEMPT SMP [ 8.899265][ T599] Skip md ftrace buffer dump for: 0x1609e0 .... .., [ 8.899544][ T599] CPU: 7 PID: 599 Comm: modprobe Tainted: G S OE 5.15.41-android13-8-g38e9b1af6bce #1 [ 8.899547][ T599] Hardware name: XXX (DT) [ 8.899549][ T599] pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) [ 8.899551][ T599] pc : gcov_info_add+0x9c/0xb8 [ 8.899557][ T599] lr : gcov_event+0x28c/0x6b8 [ 8.899559][ T599] sp : ffffffc00e733b00 [ 8.899560][ T599] x29: ffffffc00e733b00 x28: ffffffc00e733d30 x27: ffffffe8dc297470 [ 8.899563][ T599] x26: ffffffe8dc297000 x25: ffffffe8dc297000 x24: ffffffe8dc297000 [ 8.899566][ T599] x23: ffffffe8dc0a6200 x22: ffffff880f68bf20 x21: 0000000000000000 [ 8.899569][ T599] x20: ffffff880f68bf00 x19: ffffff8801babc00 x18: ffffffc00d7f9058 [ 8.899572][ T599] x17: 0000000000088793 x16: ffffff80461cbe00 x15: 9100052952800785 [ 8.899575][ T599] x14: 0000000000000200 x13: 0000000000000041 x12: 9100052952800785 [ 8.899577][ T599] x11: ffffffe8dc297000 x10: ffffffe8dc297000 x9 : ffffff80461cbc80 [ 8.899580][ T599] x8 : ffffff8801babe80 x7 : ffffffe8dc2ec000 x6 : ffffffe8dc2ed000 [ 8.899583][ T599] x5 : 000000008020001f x4 : fffffffe2006eae0 x3 : 000000008020001f [ 8.899586][ T599] x2 : ffffff8027c49200 x1 : ffffff8801babc20 x0 : ffffff80461cb3a0 [ 8.899589][ T599] Call trace: [ 8.899590][ T599] gcov_info_add+0x9c/0xb8 [ 8.899592][ T599] gcov_module_notifier+0xbc/0x120 [ 8.899595][ T599] blocking_notifier_call_chain+0xa0/0x11c [ 8.899598][ T599] do_init_module+0x2a8/0x33c [ 8.899600][ T599] load_module+0x23cc/0x261c [ 8.899602][ T599] __arm64_sys_finit_module+0x158/0x194 [ 8.899604][ T599] invoke_syscall+0x94/0x2bc [ 8.899607][ T599] el0_svc_common+0x1d8/0x34c [ 8.899609][ T599] do_el0_svc+0x40/0x54 [ 8.899611][ T599] el0_svc+0x94/0x2f0 [ 8.899613][ T599] el0t_64_sync_handler+0x88/0xec [ 8.899615][ T599] el0t_64_sync+0x1b4/0x1b8 [ 8.899618][ T599] Code: f905f56c f86e69ec f86e6a0f 8b0c01ec (f82e6a0c) [ 8.899620][ T599] ---[ end trace ed5218e9e5b6e2e6 ]--- Link: https://lkml.kernel.org/r/1668020497-13142-1-git-send-email-quic_mojha@quicinc.com Fixes: e178a5beb369 ("gcov: clang support") Signed-off-by: Mukesh Ojha Reviewed-by: Peter Oberparleiter Tested-by: Peter Oberparleiter Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Tom Rix Cc: [5.2+] Signed-off-by: Andrew Morton --- kernel/gcov/clang.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/gcov/clang.c~gcov-clang-fix-the-buffer-overflow-issue +++ a/kernel/gcov/clang.c @@ -280,6 +280,8 @@ void gcov_info_add(struct gcov_info *dst for (i = 0; i < sfn_ptr->num_counters; i++) dfn_ptr->counters[i] += sfn_ptr->counters[i]; + + sfn_ptr = list_next_entry(sfn_ptr, head); } } _ Patches currently in -mm which might be from quic_mojha@quicinc.com are gcov-clang-fix-the-buffer-overflow-issue.patch