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Message-ID: <b68145b609532e62bab603dd9686faa6562046ec.1750099179.git.lorenzo.stoakes@oracle.com>
Date: Mon, 16 Jun 2025 20:33:22 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jens Axboe <axboe@...nel.dk>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tursulin@...ulin.net>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Eric Van Hensbergen <ericvh@...nel.org>,
Latchesar Ionkov <lucho@...kov.net>,
Dominique Martinet <asmadeus@...ewreck.org>,
Christian Schoenebeck <linux_oss@...debyte.com>,
David Sterba <dsterba@...e.com>, David Howells <dhowells@...hat.com>,
Marc Dionne <marc.dionne@...istor.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
Benjamin LaHaise <bcrl@...ck.org>, Miklos Szeredi <miklos@...redi.hu>,
Amir Goldstein <amir73il@...il.com>,
Kent Overstreet <kent.overstreet@...ux.dev>,
"Tigran A . Aivazian" <aivazian.tigran@...il.com>,
Kees Cook <kees@...nel.org>, Chris Mason <clm@...com>,
Josef Bacik <josef@...icpanda.com>, Xiubo Li <xiubli@...hat.com>,
Ilya Dryomov <idryomov@...il.com>, Jan Harkes <jaharkes@...cmu.edu>,
coda@...cmu.edu, Tyler Hicks <code@...icks.com>,
Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
Yue Hu <zbestahu@...il.com>, Jeffle Xu <jefflexu@...ux.alibaba.com>,
Sandeep Dhavale <dhavale@...gle.com>,
Hongbo Li <lihongbo22@...wei.com>, Namjae Jeon <linkinjeon@...nel.org>,
Sungjong Seo <sj1557.seo@...sung.com>,
Yuezhang Mo <yuezhang.mo@...y.com>, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Jaegeuk Kim <jaegeuk@...nel.org>,
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
Viacheslav Dubeyko <slava@...eyko.com>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Yangtao Li <frank.li@...o.com>, Richard Weinberger <richard@....at>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Johannes Berg <johannes@...solutions.net>,
Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
David Woodhouse <dwmw2@...radead.org>,
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Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>,
Ryusuke Konishi <konishi.ryusuke@...il.com>,
Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
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Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@...guebit.org>,
Ronnie Sahlberg <ronniesahlberg@...il.com>,
Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>,
Bharath SM <bharathsm@...rosoft.com>,
Zhihao Cheng <chengzhihao1@...wei.com>,
Hans de Goede <hdegoede@...hat.com>, Carlos Maiolino <cem@...nel.org>,
Damien Le Moal <dlemoal@...nel.org>,
Naohiro Aota <naohiro.aota@....com>,
Johannes Thumshirn <jth@...nel.org>,
Dan Williams <dan.j.williams@...el.com>,
Matthew Wilcox <willy@...radead.org>, Vlastimil Babka <vbabka@...e.cz>,
Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
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linux-mm@...ck.org, linux-btrfs@...r.kernel.org,
ceph-devel@...r.kernel.org, codalist@...a.cs.cmu.edu,
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Subject: [PATCH 03/10] fs: consistently use file_has_valid_mmap_hooks() helper
Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file
callback"), the f_op->mmap() hook has been deprecated in favour of
f_op->mmap_prepare().
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 <lorenzo.stoakes@...cle.com>
---
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);
}
--
2.49.0
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