From nobody Sat Feb 7 17:04:38 2026 Received: from mail-pf1-f181.google.com (mail-pf1-f181.google.com [209.85.210.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1469F26E708 for ; Sun, 1 Feb 2026 17:10:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769965856; cv=none; b=XRvmL6eAdxiP+MLIVZBd+KsnvetIabFMJzjRqhL17QPpSoL8wBDVPL2t4itRdfLYFe+JKIRB+yKQ3JFh6hiz0TSrN2yU7Hp3kJLiHLXzXEv9n7vEmX2d+bOBe0XtK3v5RAg8wKaBusvaHagg8oL6px3AoiXwXIfJBKAieOiugAg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769965856; c=relaxed/simple; bh=IqXOmJBjm/ca3HDEihX+rtcdfBaG3yEMxjxvhM8LOIs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=pGWfH48cwNbrnn72Vd7Lx7djzgaqV2O484eL+EBW1P9QQvfBLLwiImxOpPkItwpwGn+1b1hdDbAxaZKwjbEfbFTn7UIv+fy2LxQadsn4yyFxcl1Q3VwmgQxcBLWL/riTByrCeAy0IEi2vYbPy1Z0lBai7FgJKiQllEkadUGPJWQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=jIaHm2jB; arc=none smtp.client-ip=209.85.210.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jIaHm2jB" Received: by mail-pf1-f181.google.com with SMTP id d2e1a72fcca58-81f4c0e2b42so2017333b3a.1 for ; Sun, 01 Feb 2026 09:10:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769965854; x=1770570654; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=u54ua+qu21FHBsf3zLWVG9pnVP6xgcSXcYQSK/iMf0g=; b=jIaHm2jB99L0jaqdNmi4tZA2GNTfDtVc5uiz+E+jDxtmTQiB67gj0YkROFbDP1wuo0 vaslkbCDmvq2mgLdCgF+WTIR5l8dFOw8eXlbVrKqcyCd1ncCcGfst9MK2Z1nqbO3SRgW 64vQ1mhowu1MgmFEgvdZHm8pYsCrVLauDVQ0U3KeqDRWL+G+77Wn1Tz66KlTqPm8vvXM Vljf3msOuylWYNwJFfha/QP7ZhiEcGMWS+9eNhryI58fV3fU3wQBpIta310oxmNBEqV9 auoaPvbNL+UuIa6iSmc2DjAz5R5YF/fw01pIRFrKBrUlgHcldrz5mVYb4VBAbAMg7lkN f8wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769965854; x=1770570654; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=u54ua+qu21FHBsf3zLWVG9pnVP6xgcSXcYQSK/iMf0g=; b=kKOAM2PxL6eCH1byEPH9N+nvg1JdEkaMGIIk4kKj7+nyx5ZItXuv3HiefuQjJ9UoNy 7lhzS9qifRB7tdSsr3EMK60lu3SOhaLN4b2yROgnrDQJa6Ro1/vp9EZWySCbUw5ZlvwL Cgijg68+vt+8Ub75VPkCb2VAuuEDEsRLaFopNp6M4rONp8RL7nO4P4QoRt2wrQUyR8sS E4ZE/VGDk68FNi6EpF9AmzXSFosPOjdfOGChhY8a8T5ExKc7QvRaqDIrgXQC+bpMl32A H5oidJKgzvDKU3aFM+3Xt1/lplqBRbXGRQSGLbjM0n/vcAjViprmsMPkWR8PYo44Tsru MhEQ== X-Gm-Message-State: AOJu0YxLp12c6DneXm1CFsfCRqaGPrlKYmOd1uSAe/RS9Cj6qUQjh5z6 91zfHeysVl8ek2zuzkTmIdOEjxM5gBbXBP8jZXPdZMuoVj78f0BFv4woSzuAXg== X-Gm-Gg: AZuq6aIHxMT6LXBepBYxAjZ295VmLDGCNaX0MsuKPCg4VKXGHQ9UFiwdExfhmbzTnfc QQDJBQfsszDSH49AL1dzRKyqH3X0h9YJAhkVbWo6xIQpwUWNtjoSiFdJz6ZmI0dovN4jf8WbL46 lXT2GPp1LICpN5kSAbltTy19yy2RA0GmqCFZP5sy1uDYS6VNE1GWOSO97l+zXA9q32/X7g0ah8S MJzFPNTP3FF33peTAdD6kK9q0KSY8bBFPXA4zCU4hcpHHTpp1jwFAU+XTvM0oZZM5y1wtnId3Id LNHyFA2amWykRTlhonieLKLAx/+GhEQblk84SVUm788wwVtPPoJqaX0xJxEiel4tbPt3+H1ah5G pmBy2YSlD8QX2LggN3UvDsG09qAvXWDOIMQtZ0cjbIyY03j789uxFu6+x/GER6ZcdMLr0AAsDAi ggp+JqZOFFmFjOF9eS X-Received: by 2002:a05:6a20:6a05:b0:38d:fe2a:4b0a with SMTP id adf61e73a8af0-392e006f5b3mr9449061637.33.1769965854039; Sun, 01 Feb 2026 09:10:54 -0800 (PST) Received: from pop-os.. ([2601:647:6802:dbc0:eb8e:fb38:51dd:c774]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c642add5199sm11579118a12.31.2026.02.01.09.10.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Feb 2026 09:10:53 -0800 (PST) From: Cong Wang To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Cong Wang , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= Subject: [PATCH] dma-buf: add SB_I_NOEXEC flag to dmabuf pseudo-filesystem Date: Sun, 1 Feb 2026 09:09:52 -0800 Message-Id: <20260201170953.19800-1-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Cong Wang The dmabuf filesystem uses alloc_anon_inode() to create anonymous inodes but does not set the SB_I_NOEXEC flag on its superblock. This triggers a VFS warning in path_noexec() when userspace mmaps a dma-buf: WARNING: CPU: 6 PID: 5660 at fs/exec.c:118 path_noexec+0x47/0x50 The warning exists to catch anonymous inode filesystems that forget to set SB_I_NOEXEC, as anonymous files should not be executable. All other pseudo-filesystems that use alloc_anon_inode() properly set this flag: - fs/anon_inodes.c: sets SB_I_NOEXEC - fs/aio.c: sets SB_I_NOEXEC - mm/secretmem.c: sets SB_I_NOEXEC Add the missing SB_I_NOEXEC flag to dma_buf_fs_init_context() to fix the warning and maintain consistency with other anonymous inode filesystems. This was triggered when testing DAXFS (https://github.com/multikernel/daxfs) and was 100% reproducible with CONFIG_DEBUG_VFS=3Dy. Cc: Sumit Semwal Cc: "Christian K=C3=B6nig" Signed-off-by: Cong Wang --- drivers/dma-buf/dma-buf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index edaa9e4ee4ae..e2e1f77aca80 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -192,6 +192,7 @@ static int dma_buf_fs_init_context(struct fs_context *f= c) ctx =3D init_pseudo(fc, DMA_BUF_MAGIC); if (!ctx) return -ENOMEM; + fc->s_iflags |=3D SB_I_NOEXEC; ctx->dops =3D &dma_buf_dentry_ops; return 0; } --=20 2.34.1