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Mon, 16 Jun 2025 19:33:50 +0000 Received: from DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2]) by DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2%6]) with mapi id 15.20.8835.026; Mon, 16 Jun 2025 19:33:50 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: "Liam R . Howlett" , Jens Axboe , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , Benjamin LaHaise , Miklos Szeredi , Amir Goldstein , Kent Overstreet , "Tigran A . Aivazian" , Kees Cook , Chris Mason , Josef Bacik , Xiubo Li , Ilya Dryomov , Jan Harkes , coda@cs.cmu.edu, Tyler Hicks , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , Viacheslav Dubeyko , John Paul Adrian Glaubitz , Yangtao Li , Richard Weinberger , Anton Ivanov , Johannes Berg , Mikulas Patocka , David Woodhouse , Dave Kleikamp , Trond Myklebust , Anna Schumaker , Ryusuke Konishi , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Bob Copeland , Mike Marshall , Martin Brandenburg , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Zhihao Cheng , Hans de Goede , Carlos Maiolino , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , Dan Williams , Matthew Wilcox , Vlastimil Babka , Jann Horn , Pedro Falcato , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-aio@kvack.org, linux-unionfs@vger.kernel.org, linux-bcachefs@vger.kernel.org, linux-mm@kvack.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev Subject: [PATCH 03/10] fs: consistently use file_has_valid_mmap_hooks() helper Date: Mon, 16 Jun 2025 20:33:22 +0100 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: X-ClientProxiedBy: LO4P123CA0571.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:276::10) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|PH0PR10MB5870:EE_ X-MS-Office365-Filtering-Correlation-Id: f597330c-860f-42de-fcf8-08ddad0cb86c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014; 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Additionally, commit bb666b7c2707 ("mm: add mmap_prepare() compatibility layer for nested file systems") permits the use of the .mmap_prepare() hook even in nested filesystems like overlayfs. There are a number of places where we check only for f_op->mmap - this is incorrect now mmap_prepare exists, so update all of these to use the general helper file_has_valid_mmap_hooks(). Most notably, this updates the elf logic to allow for the ability to execute binaries on filesystems which have the .mmap_prepare hook, but additionally we update nested filesystems. Signed-off-by: Lorenzo Stoakes --- fs/backing-file.c | 2 +- fs/binfmt_elf.c | 4 ++-- fs/binfmt_elf_fdpic.c | 2 +- fs/coda/file.c | 2 +- fs/ecryptfs/file.c | 2 +- 5 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/backing-file.c b/fs/backing-file.c index 04018679bf69..5761db9a52a9 100644 --- a/fs/backing-file.c +++ b/fs/backing-file.c @@ -333,7 +333,7 @@ int backing_file_mmap(struct file *file, struct vm_area_struct *vma, if (WARN_ON_ONCE(!(file->f_mode & FMODE_BACKING))) return -EIO; - if (!file->f_op->mmap) + if (!file_has_valid_mmap_hooks(file)) return -ENODEV; vma_set_file(vma, file); diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index a43363d593e5..a6750bd9392a 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -646,7 +646,7 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, if (!elf_check_arch(interp_elf_ex) || elf_check_fdpic(interp_elf_ex)) goto out; - if (!interpreter->f_op->mmap) + if (!file_has_valid_mmap_hooks(interpreter)) goto out; total_size = total_mapping_size(interp_elf_phdata, @@ -848,7 +848,7 @@ static int load_elf_binary(struct linux_binprm *bprm) goto out; if (elf_check_fdpic(elf_ex)) goto out; - if (!bprm->file->f_op->mmap) + if (!file_has_valid_mmap_hooks(bprm->file)) goto out; elf_phdata = load_elf_phdrs(elf_ex, bprm->file); diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 9133f3827f90..699bb9a65c27 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -109,7 +109,7 @@ static int is_elf(struct elfhdr *hdr, struct file *file) return 0; if (!elf_check_arch(hdr)) return 0; - if (!file->f_op->mmap) + if (!file_has_valid_mmap_hooks(file)) return 0; return 1; } diff --git a/fs/coda/file.c b/fs/coda/file.c index 2e6ea9319b35..eed45a80e9bc 100644 --- a/fs/coda/file.c +++ b/fs/coda/file.c @@ -160,7 +160,7 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma) size_t count; int ret; - if (!host_file->f_op->mmap) + if (!file_has_valid_mmap_hooks(host_file)) return -ENODEV; if (WARN_ON(coda_file != vma->vm_file)) diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index ce0a3c5ed0ca..2bd50d1de5ef 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -193,7 +193,7 @@ static int ecryptfs_mmap(struct file *file, struct vm_area_struct *vma) * natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs * allows recursive mounting, this will need to be extended. */ - if (!lower_file->f_op->mmap) + if (!file_has_valid_mmap_hooks(lower_file)) return -ENODEV; return generic_file_mmap(file, vma); }