mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
874c8ca1e6
While randstruct was satisfied with using an open-coded "void *" offset
cast for the netfs_i_context <-> inode casting, __builtin_object_size() as
used by FORTIFY_SOURCE was not as easily fooled. This was causing the
following complaint[1] from gcc v12:
In file included from include/linux/string.h:253,
from include/linux/ceph/ceph_debug.h:7,
from fs/ceph/inode.c:2:
In function 'fortify_memset_chk',
inlined from 'netfs_i_context_init' at include/linux/netfs.h:326:2,
inlined from 'ceph_alloc_inode' at fs/ceph/inode.c:463:2:
include/linux/fortify-string.h:242:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
242 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fix this by embedding a struct inode into struct netfs_i_context (which
should perhaps be renamed to struct netfs_inode). The struct inode
vfs_inode fields are then removed from the 9p, afs, ceph and cifs inode
structs and vfs_inode is then simply changed to "netfs.inode" in those
filesystems.
Further, rename netfs_i_context to netfs_inode, get rid of the
netfs_inode() function that converted a netfs_i_context pointer to an
inode pointer (that can now be done with &ctx->inode) and rename the
netfs_i_context() function to netfs_inode() (which is now a wrapper
around container_of()).
Most of the changes were done with:
perl -p -i -e 's/vfs_inode/netfs.inode/'g \
`git grep -l 'vfs_inode' -- fs/{9p,afs,ceph,cifs}/*.[ch]`
Kees suggested doing it with a pair structure[2] and a special
declarator to insert that into the network filesystem's inode
wrapper[3], but I think it's cleaner to embed it - and then it doesn't
matter if struct randomisation reorders things.
Dave Chinner suggested using a filesystem-specific VFS_I() function in
each filesystem to convert that filesystem's own inode wrapper struct
into the VFS inode struct[4].
Version #2:
- Fix a couple of missed name changes due to a disabled cifs option.
- Rename nfs_i_context to nfs_inode
- Use "netfs" instead of "nic" as the member name in per-fs inode wrapper
structs.
[ This also undoes commit 507160f46c ("netfs: gcc-12: temporarily
disable '-Wattribute-warning' for now") that is no longer needed ]
Fixes: bc899ee1c8 ("netfs: Add a netfs inode context")
Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
cc: Jonathan Corbet <corbet@lwn.net>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: Steve French <smfrench@gmail.com>
cc: William Kucharski <william.kucharski@oracle.com>
cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
cc: Dave Chinner <david@fromorbit.com>
cc: linux-doc@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-afs@lists.infradead.org
cc: ceph-devel@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: samba-technical@lists.samba.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-hardening@vger.kernel.org
Link: https://lore.kernel.org/r/d2ad3a3d7bdd794c6efb562d2f2b655fb67756b9.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/20220517210230.864239-1-keescook@chromium.org/ [2]
Link: https://lore.kernel.org/r/20220518202212.2322058-1-keescook@chromium.org/ [3]
Link: https://lore.kernel.org/r/20220524101205.GI2306852@dread.disaster.area/ [4]
Link: https://lore.kernel.org/r/165296786831.3591209.12111293034669289733.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165305805651.4094995.7763502506786714216.stgit@warthog.procyon.org.uk # v2
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* Internal definitions for network filesystem support
|
|
*
|
|
* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
|
|
#include <linux/netfs.h>
|
|
#include <linux/fscache.h>
|
|
#include <trace/events/netfs.h>
|
|
|
|
#ifdef pr_fmt
|
|
#undef pr_fmt
|
|
#endif
|
|
|
|
#define pr_fmt(fmt) "netfs: " fmt
|
|
|
|
/*
|
|
* buffered_read.c
|
|
*/
|
|
void netfs_rreq_unlock_folios(struct netfs_io_request *rreq);
|
|
|
|
/*
|
|
* io.c
|
|
*/
|
|
int netfs_begin_read(struct netfs_io_request *rreq, bool sync);
|
|
|
|
/*
|
|
* main.c
|
|
*/
|
|
extern unsigned int netfs_debug;
|
|
|
|
/*
|
|
* objects.c
|
|
*/
|
|
struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
|
|
struct file *file,
|
|
loff_t start, size_t len,
|
|
enum netfs_io_origin origin);
|
|
void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what);
|
|
void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async);
|
|
void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
|
|
enum netfs_rreq_ref_trace what);
|
|
struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq);
|
|
|
|
static inline void netfs_see_request(struct netfs_io_request *rreq,
|
|
enum netfs_rreq_ref_trace what)
|
|
{
|
|
trace_netfs_rreq_ref(rreq->debug_id, refcount_read(&rreq->ref), what);
|
|
}
|
|
|
|
/*
|
|
* stats.c
|
|
*/
|
|
#ifdef CONFIG_NETFS_STATS
|
|
extern atomic_t netfs_n_rh_readahead;
|
|
extern atomic_t netfs_n_rh_readpage;
|
|
extern atomic_t netfs_n_rh_rreq;
|
|
extern atomic_t netfs_n_rh_sreq;
|
|
extern atomic_t netfs_n_rh_download;
|
|
extern atomic_t netfs_n_rh_download_done;
|
|
extern atomic_t netfs_n_rh_download_failed;
|
|
extern atomic_t netfs_n_rh_download_instead;
|
|
extern atomic_t netfs_n_rh_read;
|
|
extern atomic_t netfs_n_rh_read_done;
|
|
extern atomic_t netfs_n_rh_read_failed;
|
|
extern atomic_t netfs_n_rh_zero;
|
|
extern atomic_t netfs_n_rh_short_read;
|
|
extern atomic_t netfs_n_rh_write;
|
|
extern atomic_t netfs_n_rh_write_begin;
|
|
extern atomic_t netfs_n_rh_write_done;
|
|
extern atomic_t netfs_n_rh_write_failed;
|
|
extern atomic_t netfs_n_rh_write_zskip;
|
|
|
|
|
|
static inline void netfs_stat(atomic_t *stat)
|
|
{
|
|
atomic_inc(stat);
|
|
}
|
|
|
|
static inline void netfs_stat_d(atomic_t *stat)
|
|
{
|
|
atomic_dec(stat);
|
|
}
|
|
|
|
#else
|
|
#define netfs_stat(x) do {} while(0)
|
|
#define netfs_stat_d(x) do {} while(0)
|
|
#endif
|
|
|
|
/*
|
|
* Miscellaneous functions.
|
|
*/
|
|
static inline bool netfs_is_cache_enabled(struct netfs_inode *ctx)
|
|
{
|
|
#if IS_ENABLED(CONFIG_FSCACHE)
|
|
struct fscache_cookie *cookie = ctx->cache;
|
|
|
|
return fscache_cookie_valid(cookie) && cookie->cache_priv &&
|
|
fscache_cookie_enabled(cookie);
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* debug tracing
|
|
*/
|
|
#define dbgprintk(FMT, ...) \
|
|
printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
|
|
|
|
#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
|
|
#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
|
|
#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
|
|
|
|
#ifdef __KDEBUG
|
|
#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
|
|
#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
|
|
#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
|
|
|
|
#elif defined(CONFIG_NETFS_DEBUG)
|
|
#define _enter(FMT, ...) \
|
|
do { \
|
|
if (netfs_debug) \
|
|
kenter(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define _leave(FMT, ...) \
|
|
do { \
|
|
if (netfs_debug) \
|
|
kleave(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define _debug(FMT, ...) \
|
|
do { \
|
|
if (netfs_debug) \
|
|
kdebug(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#else
|
|
#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
|
|
#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
|
|
#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
|
|
#endif
|