From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793672137; b=4ErbJ+E2WbtCI3PqxyEZkoTeEX8HgoXRa/j2jlPbBnml8LTmj/ZozBqtq5Pm1N4I4yJn T3IYaz38wBLDrjbKmlLGKuD+/UyIKtIu6YZXJdQb+oWpYvJeI3eGBME6mqG99xxr4Vo5j 6HtzVDI40hzKv87kOSJA9KgiYGZ63FyBoJevwnUezLIpXb+2XynyWE5S7CBYI2BtBWEkF HpYmawLI6zEXjDBzPN3emb0lmUxI/z4KGY0K0NEcZdGsMVk/jpopFSisT8VujQ5u22Eir KAV2sWRcyP4a1FEz2AauK35V9ekNQ4isXBTh+AyzQEDQ6fv0vn8MEUNiRi9OuvUSGlA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793672137; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=IzQsRMFTLrvrQbCT5Whmhu2ZhM0dta6kir5kjC5DJL4=; b=ADdHZ96K4sXsBwjCT5np1KM5nFSIQb7EOnDlLAR9ixy3r5OzO6izqjIc5524bH5zDz91 PhaJH7wErxPn7zminAgXEF+DmAiElpnjoUlHneK0f+15tTujiR1HeT+pDW808oylCIn9U UkiMoAwvKqvMjgYByNJvjhb6rVJucNsxsyOzHx8qd8CdBXbuGfCliMW6rLdSa5vxoyOny 2j4ratM/oTFboNDVLUuYY+N4S/SNNSq2CNJJwk65v0TECTDLtqY37T8KZNFrGHoO3nria 2DKtkQeD7BLvlyap448KLQq3EDZNmdZrNtEJxyKT62AIT181928uCe6nsuHcbOKmmyw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=cn6EcGQN; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4522A606A329; Tue, 3 Nov 2026 02:15:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=cn6EcGQN Received: by smtp.kernel.org (Postfix) with ESMTPSA id 064411F000C1; Tue, 3 Nov 2026 02:15:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1793672137; bh=IzQsRMFTLrvrQbCT5Whmhu2ZhM0dta6kir5kjC5DJL4=; h=Date:To:From:Subject; b=cn6EcGQNpohiGm4jgnzeY41zbZLCtckMnQdhFZ264obKhMRE4D610MS5CYdOX5/Gk g2/dRS3FsYwpCXro13/VQzblBApCCl8dAYf955omyXcCq57ImtjRYaVeLOtB0anj4e MXY4AGLoARC05srB31DcsM3K08BdzGJwaGZUivgY= Date: Mon, 02 Nov 2026 18:15:36 -0800 To: mm-commits@vger.kernel.org,vbabka@kernel.org,usama.anjum@arm.com, stable@vger.kernel.org,pfalcato@suse.de,mirq-linux@rere.qmqm.pl, ljs@kernel.org,liam@infradead.org,jannh@google.com,david@kernel.org, avagin@gmail.com,arnd@arndb.de,hengyul@cs.unc.edu,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-hotfixes-stable] fs-proc-task_mmu-return-enotty-for-unknown-pagemap-ioctls.patch removed from -mm tree Message-Id: <20261103021537.064411F000C1@smtp.kernel.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The quilt patch titled Subject: fs/proc/task_mmu: return -ENOTTY for unknown pagemap ioctls has been removed from the -mm tree. Its filename was fs-proc-task_mmu-return-enotty-for-unknown-pagemap-ioctls.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Hengyu Liang Subject: fs/proc/task_mmu: return -ENOTTY for unknown pagemap ioctls Date: Fri, 23 Oct 2026 14:13:00 -0400 Commit 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") made do_pagemap_cmd() the ioctl handler of /proc//pagemap. However, do_pagemap_cmd() returns -EINVAL for every command other than PAGEMAP_SCAN. Before that commit, pagemap had no ioctl handler, and the VFS returned -ENOTTY for these commands. As of now, they fail with EINVAL, so tcgetattr() and isatty() on pagemap report EINVAL instead of ENOTTY. The issue can be reproduced with a simple C program: #include #include #include int main(void) { struct termios t; int fd = open("/proc/self/pagemap", O_RDONLY); if (tcgetattr(fd, &t) < 0) perror("tcgetattr"); return 0; } Before that commit, the result is: tcgetattr: Inappropriate ioctl for device After that commit, the result is: tcgetattr: Invalid argument This patch will return -ENOIOCTLCMD for unknown commands, as procfs_procmap_ioctl() in the same file does, so that the VFS turns it into -ENOTTY. Link: https://lore.kernel.org/20261023181300.3366487-1-hengyul@cs.unc.edu Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") Signed-off-by: Hengyu Liang Signed-off-by: Andrew Morton Acked-by: David Hildenbrand (Arm) Reviewed-by: Pedro Falcato Reviewed-by: Lorenzo Stoakes (ARM) Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Jann Horn Cc: Muhammad Usama Anjum Cc: Andrei Vagin Cc: Michał Mirosław Cc: Arnd Bergmann Cc: --- fs/proc/task_mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/proc/task_mmu.c~fs-proc-task_mmu-return-enotty-for-unknown-pagemap-ioctls +++ a/fs/proc/task_mmu.c @@ -3201,7 +3201,7 @@ static long do_pagemap_cmd(struct file * return do_pagemap_scan(mm, arg); default: - return -EINVAL; + return -ENOIOCTLCMD; } } _ Patches currently in -mm which might be from hengyul@cs.unc.edu are