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vfs-6.14-rc7.fixes

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Merge tag 'vfs-6.14-rc7.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Bring in an RCU pathwalk fix for afs. This is brought in as a merge
   from the vfs-6.15.shared.afs branch that needs this commit and other
   trees already depend on it.

 - Fix vboxfs unterminated string handling.

* tag 'vfs-6.14-rc7.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs:
  vboxsf: Add __nonstring annotations for unterminated strings
  afs: Fix afs_atcell_get_link() to handle RCU pathwalk
This commit is contained in:
Linus Torvalds 2025-03-13 07:53:25 -10:00
commit 8f7617f450
5 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
fs/afs/cell.c
View File

@ -64,7 +64,8 @@ static struct afs_cell *afs_find_cell_locked(struct afs_net *net,
return ERR_PTR(-ENAMETOOLONG);
if (!name) {
cell = net->ws_cell;
cell = rcu_dereference_protected(net->ws_cell,
lockdep_is_held(&net->cells_lock));
if (!cell)
return ERR_PTR(-EDESTADDRREQ);
goto found;
@ -388,8 +389,8 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
/* install the new cell */
down_write(&net->cells_lock);
afs_see_cell(new_root, afs_cell_trace_see_ws);
old_root = net->ws_cell;
net->ws_cell = new_root;
old_root = rcu_replace_pointer(net->ws_cell, new_root,
lockdep_is_held(&net->cells_lock));
up_write(&net->cells_lock);
afs_unuse_cell(net, old_root, afs_cell_trace_unuse_ws);
@ -945,8 +946,8 @@ void afs_cell_purge(struct afs_net *net)
_enter("");
down_write(&net->cells_lock);
ws = net->ws_cell;
net->ws_cell = NULL;
ws = rcu_replace_pointer(net->ws_cell, NULL,
lockdep_is_held(&net->cells_lock));
up_write(&net->cells_lock);
afs_unuse_cell(net, ws, afs_cell_trace_unuse_ws);

15
fs/afs/dynroot.c
View File

@ -314,12 +314,23 @@ static const char *afs_atcell_get_link(struct dentry *dentry, struct inode *inod
const char *name;
bool dotted = vnode->fid.vnode == 3;
if (!net->ws_cell)
if (!dentry) {
/* We're in RCU-pathwalk. */
cell = rcu_dereference(net->ws_cell);
if (dotted)
name = cell->name - 1;
else
name = cell->name;
/* Shouldn't need to set a delayed call. */
return name;
}
if (!rcu_access_pointer(net->ws_cell))
return ERR_PTR(-ENOENT);
down_read(&net->cells_lock);
cell = net->ws_cell;
cell = rcu_dereference_protected(net->ws_cell, lockdep_is_held(&net->cells_lock));
if (dotted)
name = cell->name - 1;
else

2
fs/afs/internal.h
View File

@ -287,7 +287,7 @@ struct afs_net {
/* Cell database */
struct rb_root cells;
struct afs_cell *ws_cell;
struct afs_cell __rcu *ws_cell;
struct work_struct cells_manager;
struct timer_list cells_timer;
atomic_t cells_outstanding;

4
fs/afs/proc.c
View File

@ -206,7 +206,7 @@ static int afs_proc_rootcell_show(struct seq_file *m, void *v)
net = afs_seq2net_single(m);
down_read(&net->cells_lock);
cell = net->ws_cell;
cell = rcu_dereference_protected(net->ws_cell, lockdep_is_held(&net->cells_lock));
if (cell)
seq_printf(m, "%s\n", cell->name);
up_read(&net->cells_lock);
@ -242,7 +242,7 @@ static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
ret = -EEXIST;
inode_lock(file_inode(file));
if (!net->ws_cell)
if (!rcu_access_pointer(net->ws_cell))
ret = afs_cell_init(net, buf);
else
printk("busy\n");

3
fs/vboxsf/super.c
View File

@ -21,8 +21,7 @@
#define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */
static const unsigned char VBSF_MOUNT_SIGNATURE[4] = { '\000', '\377', '\376',
'\375' };
static const unsigned char VBSF_MOUNT_SIGNATURE[4] __nonstring = "\000\377\376\375";
static int follow_symlinks;
module_param(follow_symlinks, int, 0444);