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{
    "id": 2219767,
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    "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260404101005.5-powerpc-boot-pengpeng@iscas.ac.cn/",
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        "id": 2,
        "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api",
        "name": "Linux PPC development",
        "link_name": "linuxppc-dev",
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        "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"
    },
    "msgid": "<20260404101005.5-powerpc-boot-pengpeng@iscas.ac.cn>",
    "date": "2026-04-03T08:56:36",
    "name": "powerpc/boot: validate compatible entries before comparing them",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "74e921369411c4ee4579dabfd612f598a5d85385",
    "submitter": {
        "id": 93000,
        "url": "http://patchwork.ozlabs.org/api/1.1/people/93000/?format=api",
        "name": "Pengpeng Hou",
        "email": "pengpeng@iscas.ac.cn"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260404101005.5-powerpc-boot-pengpeng@iscas.ac.cn/mbox/",
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        {
            "id": 498708,
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            "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498708",
            "date": "2026-04-03T08:56:36",
            "name": "powerpc/boot: validate compatible entries before comparing them",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/498708/mbox/"
        }
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        "From": "Pengpeng Hou <pengpeng@iscas.ac.cn>",
        "Date": "Fri, 3 Apr 2026 16:56:36 +0800",
        "Message-ID": "<20260404101005.5-powerpc-boot-pengpeng@iscas.ac.cn>",
        "To": "Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>",
        "Cc": "Nicholas Piggin <npiggin@gmail.com>,\n \"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\n linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,\n pengpeng@iscas.ac.cn",
        "Subject": "[PATCH] powerpc/boot: validate compatible entries before comparing\n them",
        "X-CM-TRANSID": "zQCowAD3hAgH0dBpKbVzDA--.7742S2",
        "X-Coremail-Antispam": "1UD129KBjvJXoWruw13CFyDKry7Aw1UKrW7Arb_yoW8JryxpF\n\tZ0yF9Fy3yrWw4UAay3KF1rWFyYvwn2kF4Utw4DW34kArnFqFy0gF1jkF1YvrW8WFySg3yS\n\tvFWrKw10vF4fWaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUvl14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\n\trVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2jI8I6cxK6x804I0_Grv_XF1l8cAvFVAK0II2c7\n\txJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE\n\t2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwV\n\tC2z280aVCY1x0267AKxVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC\n\t0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUAVWUtwAv7VC2z280aVAFwI0_Jr0_Gr\n\t1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcVAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIF\n\txwCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJV\n\tW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF\n\t1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6x\n\tIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvE\n\tx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvj\n\tDU0xZFpf9x0JUmjgxUUUUU=",
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    },
    "content": "`dt_is_compatible()` reads a raw `\"compatible\"` property into `prop_buf`\nand then immediately calls `strcmp(buf + pos, compat)` on each string-list\nentry.\n\nIf the current entry is not NUL-terminated within the returned property\nlength, `strcmp()` reads past the end of the local buffer before the\nfollowing `strnlen()` has any chance to reject the malformed property.\n\nValidate the current entry with `strnlen()` first and only compare\nbounded, terminated compatible strings.\n\nSigned-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>\n---\n arch/powerpc/boot/devtree.c | 9 +++++++--\n 1 file changed, 7 insertions(+), 2 deletions(-)",
    "diff": "diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c\nindex 58fbcfcc98c9..d93822f61831 100644\n--- a/arch/powerpc/boot/devtree.c\n+++ b/arch/powerpc/boot/devtree.c\n@@ -343,11 +343,16 @@ int dt_is_compatible(void *node, const char *compat)\n \tif (len < 0)\n \t\treturn 0;\n \n-\tfor (pos = 0; pos < len; pos++) {\n+\tfor (pos = 0; pos < len; ) {\n+\t\tint entry_len = strnlen(&buf[pos], len - pos);\n+\n+\t\tif (entry_len == len - pos)\n+\t\t\treturn 0;\n+\n \t\tif (!strcmp(buf + pos, compat))\n \t\t\treturn 1;\n \n-\t\tpos += strnlen(&buf[pos], len - pos);\n+\t\tpos += entry_len + 1;\n \t}\n \n \treturn 0;\n",
    "prefixes": []
}