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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org RnJvbTogTGl1IFNvbmcgPGxpdS5zb25nMTFAenRlLmNvbS5jbj4KClsgVXBzdHJlYW0gY29tbWl0 IGFjYzVhZjNlZmEzMDNkNWYzNmNjOGMwZjYxNzE2MTYxZjZjYTEzODQgXQoKSW4g4oCcdWJpZnNf Y2hlY2tfbm9kZeKAnSwgd2hlbiB0aGUgdmFsdWUgb2YgIm5vZGVfbGVuIiBpcyBhYm5vcm1hbCwK dGhlIGNvZGUgd2lsbCBnb3RvIGxhYmVsIG9mICJvdXRfbGVuIiBmb3IgZXhlY3V0aW9uLiBUaGVu LCBpbiB0aGUKZm9sbG93aW5nICJ1Ymlmc19kdW1wX25vZGUiLCBpZiBpbm9kZSB0eXBlIGlzICJV QklGU19EQVRBX05PREUiLAppbiAicHJpbnRfaGV4X2R1bXAiLCBhbiBvdXQtb2YtYm91bmRzIGFj Y2VzcyBtYXkgb2NjdXIgZHVlIHRvIHRoZQp3cm9uZyAiY2gtPmxlbiIuCgpUaGVyZWZvcmUsIHdo ZW4gdGhlIHZhbHVlIG9mICJub2RlX2xlbiIgaXMgYWJub3JtYWwsIGRhdGEgbGVuZ3RoCnNob3Vs ZCB0byBiZSBhZGp1c3RlZCB0byBhIHJlYXNvbmFibGUgc2FmZSByYW5nZS4gQXQgdGhpcyB0aW1l LApzdHJ1Y3R1cmVkIGRhdGEgaXMgbm90IGNyZWRpYmxlLCBzbyBkdW1wIHRoZSBjb3JydXB0ZWQg ZGF0YSBkaXJlY3RseQpmb3IgYW5hbHlzaXMuCgpTaWduZWQtb2ZmLWJ5OiBMaXUgU29uZyA8bGl1 LnNvbmcxMUB6dGUuY29tLmNuPgpTaWduZWQtb2ZmLWJ5OiBSaWNoYXJkIFdlaW5iZXJnZXIgPHJp Y2hhcmRAbm9kLmF0PgpTaWduZWQtb2ZmLWJ5OiBTYXNoYSBMZXZpbiA8c2FzaGFsQGtlcm5lbC5v cmc+Ci0tLQogZnMvdWJpZnMvaW8uYyB8IDE2ICsrKysrKysrKysrKysrLS0KIDEgZmlsZSBjaGFu Z2VkLCAxNCBpbnNlcnRpb25zKCspLCAyIGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2ZzL3Vi aWZzL2lvLmMgYi9mcy91Ymlmcy9pby5jCmluZGV4IDA5OWJlYzk0YjgyMDcuLmZhYjI5Zjg5OWY5 MTMgMTAwNjQ0Ci0tLSBhL2ZzL3ViaWZzL2lvLmMKKysrIGIvZnMvdWJpZnMvaW8uYwpAQCAtMjM3 LDcgKzIzNyw3IEBAIGludCB1Ymlmc19pc19tYXBwZWQoY29uc3Qgc3RydWN0IHViaWZzX2luZm8g KmMsIGludCBsbnVtKQogaW50IHViaWZzX2NoZWNrX25vZGUoY29uc3Qgc3RydWN0IHViaWZzX2lu Zm8gKmMsIGNvbnN0IHZvaWQgKmJ1ZiwgaW50IGxudW0sCiAJCSAgICAgaW50IG9mZnMsIGludCBx dWlldCwgaW50IG11c3RfY2hrX2NyYykKIHsKLQlpbnQgZXJyID0gLUVJTlZBTCwgdHlwZSwgbm9k ZV9sZW47CisJaW50IGVyciA9IC1FSU5WQUwsIHR5cGUsIG5vZGVfbGVuLCBkdW1wX25vZGUgPSAx OwogCXVpbnQzMl90IGNyYywgbm9kZV9jcmMsIG1hZ2ljOwogCWNvbnN0IHN0cnVjdCB1Ymlmc19j aCAqY2ggPSBidWY7CiAKQEAgLTI5MCwxMCArMjkwLDIyIEBAIGludCB1Ymlmc19jaGVja19ub2Rl KGNvbnN0IHN0cnVjdCB1Ymlmc19pbmZvICpjLCBjb25zdCB2b2lkICpidWYsIGludCBsbnVtLAog b3V0X2xlbjoKIAlpZiAoIXF1aWV0KQogCQl1Ymlmc19lcnIoYywgImJhZCBub2RlIGxlbmd0aCAl ZCIsIG5vZGVfbGVuKTsKKwlpZiAodHlwZSA9PSBVQklGU19EQVRBX05PREUgJiYgbm9kZV9sZW4g PiBVQklGU19EQVRBX05PREVfU1opCisJCWR1bXBfbm9kZSA9IDA7CiBvdXQ6CiAJaWYgKCFxdWll dCkgewogCQl1Ymlmc19lcnIoYywgImJhZCBub2RlIGF0IExFQiAlZDolZCIsIGxudW0sIG9mZnMp OwotCQl1Ymlmc19kdW1wX25vZGUoYywgYnVmKTsKKwkJaWYgKGR1bXBfbm9kZSkgeworCQkJdWJp ZnNfZHVtcF9ub2RlKGMsIGJ1Zik7CisJCX0gZWxzZSB7CisJCQlpbnQgc2FmZV9sZW4gPSBtaW4z KG5vZGVfbGVuLCBjLT5sZWJfc2l6ZSAtIG9mZnMsCisJCQkJKGludClVQklGU19NQVhfREFUQV9O T0RFX1NaKTsKKwkJCXByX2VycigiXHRwcmV2ZW50IG91dC1vZi1ib3VuZHMgbWVtb3J5IGFjY2Vz c1xuIik7CisJCQlwcl9lcnIoIlx0dHJ1bmNhdGVkIGRhdGEgbm9kZSBsZW5ndGggICAgICAlZFxu Iiwgc2FmZV9sZW4pOworCQkJcHJfZXJyKCJcdGNvcnJ1cHRlZCBkYXRhIG5vZGU6XG4iKTsKKwkJ CXByaW50X2hleF9kdW1wKEtFUk5fRVJSLCAiXHQiLCBEVU1QX1BSRUZJWF9PRkZTRVQsIDMyLCAx LAorCQkJCQlidWYsIHNhZmVfbGVuLCAwKTsKKwkJfQogCQlkdW1wX3N0YWNrKCk7CiAJfQogCXJl dHVybiBlcnI7Ci0tIAoyLjI1LjEKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX18KTGludXggTVREIGRpc2N1c3Npb24gbWFpbGluZyBsaXN0Cmh0 dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtbXRkLwo= 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 X-Spam-Level: X-Spam-Status: No, score=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25EEFC43465 for ; 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Fri, 18 Sep 2020 02:10:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395043; bh=wuwivKWk78F0qidLjLDtmuZIOTQvoh4rYToGzZ/ON+A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H9mBgoBQpl5CUxWz6h4KKiKiUNmrxJmx/yzSLWvU51vzfOOvI+i7oo0VZYbKR3k81 RiqbcmpKapNYVZCfddTjAynfx5p+RJFQsrGSt8IIrjTrRcV4GwnYLt+iq/zbw9/51j uv9yKI4TFJkjDVg7k6q6nPyZ0rZr3iYRbCEs9KZk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Liu Song , Richard Weinberger , Sasha Levin , linux-mtd@lists.infradead.org Subject: [PATCH AUTOSEL 4.19 133/206] ubifs: Fix out-of-bounds memory access caused by abnormal value of node_len Date: Thu, 17 Sep 2020 22:06:49 -0400 Message-Id: <20200918020802.2065198-133-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020802.2065198-1-sashal@kernel.org> References: <20200918020802.2065198-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Liu Song [ Upstream commit acc5af3efa303d5f36cc8c0f61716161f6ca1384 ] In “ubifs_check_node”, when the value of "node_len" is abnormal, the code will goto label of "out_len" for execution. Then, in the following "ubifs_dump_node", if inode type is "UBIFS_DATA_NODE", in "print_hex_dump", an out-of-bounds access may occur due to the wrong "ch->len". Therefore, when the value of "node_len" is abnormal, data length should to be adjusted to a reasonable safe range. At this time, structured data is not credible, so dump the corrupted data directly for analysis. Signed-off-by: Liu Song Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- fs/ubifs/io.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c index 099bec94b8207..fab29f899f913 100644 --- a/fs/ubifs/io.c +++ b/fs/ubifs/io.c @@ -237,7 +237,7 @@ int ubifs_is_mapped(const struct ubifs_info *c, int lnum) int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, int offs, int quiet, int must_chk_crc) { - int err = -EINVAL, type, node_len; + int err = -EINVAL, type, node_len, dump_node = 1; uint32_t crc, node_crc, magic; const struct ubifs_ch *ch = buf; @@ -290,10 +290,22 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, out_len: if (!quiet) ubifs_err(c, "bad node length %d", node_len); + if (type == UBIFS_DATA_NODE && node_len > UBIFS_DATA_NODE_SZ) + dump_node = 0; out: if (!quiet) { ubifs_err(c, "bad node at LEB %d:%d", lnum, offs); - ubifs_dump_node(c, buf); + if (dump_node) { + ubifs_dump_node(c, buf); + } else { + int safe_len = min3(node_len, c->leb_size - offs, + (int)UBIFS_MAX_DATA_NODE_SZ); + pr_err("\tprevent out-of-bounds memory access\n"); + pr_err("\ttruncated data node length %d\n", safe_len); + pr_err("\tcorrupted data node:\n"); + print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1, + buf, safe_len, 0); + } dump_stack(); } return err; -- 2.25.1