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Wed, 16 Sep 2026 08:25:52 +0000 X-Mizu-Trace-ID: ee530d7fdc31aba6 X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Wed, 16 Sep 2026 16:25:30 +0800 Subject: [PATCH 3/3] mm/vmalloc: skip vmalloc_dump_obj for non-vmalloc addresses MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260916-vmalloc_dump_obj-v1-3-7aa402d224df@linux.dev> References: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev> In-Reply-To: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ye Liu X-Mailer: b4 0.14.3 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 86373180004 X-Stat-Signature: b4ap9uyg41xr9sm9emf7eqtg5kxzbzte X-Rspam-User: X-HE-Tag: 1789547153-627065 X-HE-Meta: U2FsdGVkX1+3qBF+ePUilhPJaqGkJ8+MkXhUUtH6rv5knCXUajMTYrg+2jkDopeZXxREsCbeuYJXjnRcDkZxCnbr/R5JM4i6bRyucRA/daDgBJsEP+KFpTbXkyJrlX90+C2UPlh8ESx/9QKTAsZ+ye5zSSE1ZzfVtPDkvmdMoy2DXcPXLKyqu2J5LvswRtEVoOI9l7oqNfX8lNX02rL8r2k7a4dgihn3psMockk3ZQUvZQhDUio20yUhooBxLl6FLfIiuBS+YrB0KKXJ1zzM8L35r68RCPDgUgkOeXz/OFgjuJ3DZ311OzFRX7mnGyX9/pLPWmjR4FFZ4tYyMlWD4VnCumw7uXzOkrIraC+yIQdfS6/ApIK/bGzBIoy6y70eGuESb/UJgzW8BSR9wuzlbtfQhxpayiiiIIKoCDAz8KkynvWE7dTtu5aLRdK0XsIk0yTnY2IbfpR/m4zecbbOWqPqcS7h6MmrqVCxeuKfJastKglE0SkPZ/woeELKr5f685Cdb42VxfDM+piktTpLFSujBLojDwwcuUXNA81x+y1ufc5mnPkjOWmnnPMTgUk3IAE9WvJ5xCmDeXfxslwWusXUZ/V8PFDno1moCjNSUnP/5Z5WRBG9Q+Q7NYvqqHQgoq1aBHfDBuGJIGjaikjTi0jiseL+Zr2bV/ZkKJwX5mTMo7BALHfgM2BRKtV5n7B0h57DXOGE1ARyd4XkeEUdiAUouhQ7ShsGefiCk0jvA0bS15NJ3fWpudq83Zp950yaBQcEQG6ksdFNQPUAjEAC1tBaGjOchJs9WMi4b1twuQ+u/hJurNSPEdnJImiNPEIr14co6t1qdRk5tgf+VytB03G9x+pO1L1aSF+2n9adti04XD1AEIVy7ubc21q/YFQB6dG9e7G+Is6LxnxzecekabAEiydfa8T5Ryn0ODXwSxd4vzUEy9c1vxeOkSmT7Unah/sWxFbt6g1Du/VD5v3 rhcY/HMd 9QTUPnsBITrc28JDPBJAuRnnNi92/G2AEpiRfmU9hrun03vO/XnwGAHANojKHxbbNJu3V4FMlCs/Xz6WXqxd3FcJUhOTPALUE7cO6SqCIUnFPtsVHrvB+G7WYKj92iT2GmxKmR/p5F5zxsZlruJ2iDPc2T+mD9lhjYzTj8w8eA+q1QxQCFToDN1JsJkn4MnJiLk0omuV/bqyORKMwFUX0hSLC4rb8/fgXMWimWSke3AN2XcC9fgx642YvyCjeQ2qhsKcGEZfYNQKow1KBFVzUCks+OG6Pdcs/ds2JyjXlZYYF0jN8SKPQTLsVRA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu vmalloc_dump_obj() unconditionally searches all vmap nodes even when called with a non-vmalloc address (e.g. a slab or stack pointer from mem_dump_obj()). Add an is_vmalloc_addr() check at the entry to avoid the unnecessary per-node trylock and rb-tree traversal. The KASAN caller already gates on is_vmalloc_addr(), but mem_dump_obj() calls vmalloc_dump_obj() before the fallback type check, so the guard in the callee covers both paths without requiring caller changes. Signed-off-by: Ye Liu --- mm/vmalloc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 30c610f678dc..b3e706fde202 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -5277,6 +5277,9 @@ bool vmalloc_dump_obj(void *object) unsigned long addr; unsigned long nr_pages; + if (!is_vmalloc_addr(object)) + return false; + addr = PAGE_ALIGN_DOWN((unsigned long) object); /* -- 2.25.1