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![David Howells](/assets/img/avatar_default.png)
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 commit507160f46c
("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>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* V9FS cache definitions.
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*
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* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
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*/
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#include <linux/jiffies.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <net/9p/9p.h>
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#include "v9fs.h"
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#include "cache.h"
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int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
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const char *dev_name)
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{
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struct fscache_volume *vcookie;
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char *name, *p;
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name = kasprintf(GFP_KERNEL, "9p,%s,%s",
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dev_name, v9ses->cachetag ?: v9ses->aname);
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if (!name)
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return -ENOMEM;
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for (p = name; *p; p++)
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if (*p == '/')
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*p = ';';
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vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
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p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
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v9ses, vcookie, name);
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if (IS_ERR(vcookie)) {
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if (vcookie != ERR_PTR(-EBUSY)) {
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kfree(name);
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return PTR_ERR(vcookie);
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}
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pr_err("Cache volume key already in use (%s)\n", name);
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vcookie = NULL;
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}
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v9ses->fscache = vcookie;
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kfree(name);
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return 0;
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}
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void v9fs_cache_inode_get_cookie(struct inode *inode)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct v9fs_session_info *v9ses;
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__le32 version;
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__le64 path;
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if (!S_ISREG(inode->i_mode))
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return;
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if (WARN_ON(v9fs_inode_cookie(v9inode)))
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return;
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version = cpu_to_le32(v9inode->qid.version);
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path = cpu_to_le64(v9inode->qid.path);
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v9ses = v9fs_inode2v9ses(inode);
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v9inode->netfs.cache =
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fscache_acquire_cookie(v9fs_session_cache(v9ses),
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0,
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&path, sizeof(path),
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&version, sizeof(version),
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i_size_read(&v9inode->netfs.inode));
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p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
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inode, v9fs_inode_cookie(v9inode));
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}
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