mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-12 21:44:06 +08:00
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>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* V9FS cache definitions.
|
|
*
|
|
* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
|
|
*/
|
|
|
|
#include <linux/jiffies.h>
|
|
#include <linux/file.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/fs.h>
|
|
#include <net/9p/9p.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "cache.h"
|
|
|
|
int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
|
|
const char *dev_name)
|
|
{
|
|
struct fscache_volume *vcookie;
|
|
char *name, *p;
|
|
|
|
name = kasprintf(GFP_KERNEL, "9p,%s,%s",
|
|
dev_name, v9ses->cachetag ?: v9ses->aname);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
for (p = name; *p; p++)
|
|
if (*p == '/')
|
|
*p = ';';
|
|
|
|
vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
|
|
p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
|
|
v9ses, vcookie, name);
|
|
if (IS_ERR(vcookie)) {
|
|
if (vcookie != ERR_PTR(-EBUSY)) {
|
|
kfree(name);
|
|
return PTR_ERR(vcookie);
|
|
}
|
|
pr_err("Cache volume key already in use (%s)\n", name);
|
|
vcookie = NULL;
|
|
}
|
|
v9ses->fscache = vcookie;
|
|
kfree(name);
|
|
return 0;
|
|
}
|
|
|
|
void v9fs_cache_inode_get_cookie(struct inode *inode)
|
|
{
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
struct v9fs_session_info *v9ses;
|
|
__le32 version;
|
|
__le64 path;
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return;
|
|
if (WARN_ON(v9fs_inode_cookie(v9inode)))
|
|
return;
|
|
|
|
version = cpu_to_le32(v9inode->qid.version);
|
|
path = cpu_to_le64(v9inode->qid.path);
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
v9inode->netfs.cache =
|
|
fscache_acquire_cookie(v9fs_session_cache(v9ses),
|
|
0,
|
|
&path, sizeof(path),
|
|
&version, sizeof(version),
|
|
i_size_read(&v9inode->netfs.inode));
|
|
|
|
p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
|
|
inode, v9fs_inode_cookie(v9inode));
|
|
}
|