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Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c87
1 files changed, 42 insertions, 45 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 88339f59efb..9eb787e5c16 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -332,10 +332,11 @@ int generic_permission(struct inode *inode, int mask)
if (S_ISDIR(inode->i_mode)) {
/* DACs are overridable for directories */
- if (inode_capable(inode, CAP_DAC_OVERRIDE))
+ if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
return 0;
if (!(mask & MAY_WRITE))
- if (inode_capable(inode, CAP_DAC_READ_SEARCH))
+ if (capable_wrt_inode_uidgid(inode,
+ CAP_DAC_READ_SEARCH))
return 0;
return -EACCES;
}
@@ -345,7 +346,7 @@ int generic_permission(struct inode *inode, int mask)
* at least one exec bit set.
*/
if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
- if (inode_capable(inode, CAP_DAC_OVERRIDE))
+ if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
return 0;
/*
@@ -353,11 +354,12 @@ int generic_permission(struct inode *inode, int mask)
*/
mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
if (mask == MAY_READ)
- if (inode_capable(inode, CAP_DAC_READ_SEARCH))
+ if (capable_wrt_inode_uidgid(inode, CAP_DAC_READ_SEARCH))
return 0;
return -EACCES;
}
+EXPORT_SYMBOL(generic_permission);
/*
* We _really_ want to just do "generic_permission()" without
@@ -455,6 +457,7 @@ int inode_permission(struct inode *inode, int mask)
return retval;
return __inode_permission(inode, mask);
}
+EXPORT_SYMBOL(inode_permission);
/**
* path_get - get a reference to a path
@@ -924,6 +927,7 @@ int follow_up(struct path *path)
path->mnt = &parent->mnt;
return 1;
}
+EXPORT_SYMBOL(follow_up);
/*
* Perform an automount
@@ -1085,6 +1089,7 @@ int follow_down_one(struct path *path)
}
return 0;
}
+EXPORT_SYMBOL(follow_down_one);
static inline bool managed_dentry_might_block(struct dentry *dentry)
{
@@ -1223,6 +1228,7 @@ int follow_down(struct path *path)
}
return 0;
}
+EXPORT_SYMBOL(follow_down);
/*
* Skip to top of mountpoint pile in refwalk mode for follow_dotdot()
@@ -1537,7 +1543,7 @@ static inline int walk_component(struct nameidata *nd, struct path *path,
inode = path->dentry->d_inode;
}
err = -ENOENT;
- if (!inode)
+ if (!inode || d_is_negative(path->dentry))
goto out_path_put;
if (should_follow_link(path->dentry, follow)) {
@@ -2025,6 +2031,7 @@ int kern_path(const char *name, unsigned int flags, struct path *path)
*path = nd.path;
return res;
}
+EXPORT_SYMBOL(kern_path);
/**
* vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
@@ -2049,6 +2056,7 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
*path = nd.path;
return err;
}
+EXPORT_SYMBOL(vfs_path_lookup);
/*
* Restricted form of lookup. Doesn't follow links, single-component only,
@@ -2111,6 +2119,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
return __lookup_hash(&this, base, 0);
}
+EXPORT_SYMBOL(lookup_one_len);
int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty)
@@ -2135,6 +2144,7 @@ int user_path_at(int dfd, const char __user *name, unsigned flags,
{
return user_path_at_empty(dfd, name, flags, path, NULL);
}
+EXPORT_SYMBOL(user_path_at);
/*
* NB: most callers don't do anything directly with the reference to the
@@ -2240,15 +2250,16 @@ mountpoint_last(struct nameidata *nd, struct path *path)
mutex_unlock(&dir->d_inode->i_mutex);
done:
- if (!dentry->d_inode) {
+ if (!dentry->d_inode || d_is_negative(dentry)) {
error = -ENOENT;
dput(dentry);
goto out;
}
path->dentry = dentry;
- path->mnt = mntget(nd->path.mnt);
+ path->mnt = nd->path.mnt;
if (should_follow_link(dentry, nd->flags & LOOKUP_FOLLOW))
return 1;
+ mntget(path->mnt);
follow_mount(path);
error = 0;
out:
@@ -2370,7 +2381,7 @@ static inline int check_sticky(struct inode *dir, struct inode *inode)
return 0;
if (uid_eq(dir->i_uid, fsuid))
return 0;
- return !inode_capable(inode, CAP_FOWNER);
+ return !capable_wrt_inode_uidgid(inode, CAP_FOWNER);
}
/*
@@ -2477,6 +2488,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);
return NULL;
}
+EXPORT_SYMBOL(lock_rename);
void unlock_rename(struct dentry *p1, struct dentry *p2)
{
@@ -2486,6 +2498,7 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
}
}
+EXPORT_SYMBOL(unlock_rename);
int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool want_excl)
@@ -2506,6 +2519,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
fsnotify_create(dir, dentry);
return error;
}
+EXPORT_SYMBOL(vfs_create);
static int may_open(struct path *path, int acc_mode, int flag)
{
@@ -2982,7 +2996,7 @@ retry_lookup:
finish_lookup:
/* we _can_ be in RCU mode here */
error = -ENOENT;
- if (d_is_negative(path->dentry)) {
+ if (!inode || d_is_negative(path->dentry)) {
path_to_nameidata(path, nd);
goto out;
}
@@ -3375,6 +3389,7 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
fsnotify_create(dir, dentry);
return error;
}
+EXPORT_SYMBOL(vfs_mknod);
static int may_mknod(umode_t mode)
{
@@ -3464,6 +3479,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
fsnotify_mkdir(dir, dentry);
return error;
}
+EXPORT_SYMBOL(vfs_mkdir);
SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
{
@@ -3518,6 +3534,7 @@ void dentry_unhash(struct dentry *dentry)
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
}
+EXPORT_SYMBOL(dentry_unhash);
int vfs_rmdir(struct inode *dir, struct dentry *dentry)
{
@@ -3555,6 +3572,7 @@ out:
d_delete(dentry);
return error;
}
+EXPORT_SYMBOL(vfs_rmdir);
static long do_rmdir(int dfd, const char __user *pathname)
{
@@ -3672,6 +3690,7 @@ out:
return error;
}
+EXPORT_SYMBOL(vfs_unlink);
/*
* Make sure that the actual truncation of the file will occur outside its
@@ -3785,6 +3804,7 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
fsnotify_create(dir, dentry);
return error;
}
+EXPORT_SYMBOL(vfs_symlink);
SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
@@ -3893,6 +3913,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
fsnotify_link(dir, inode, new_dentry);
return error;
}
+EXPORT_SYMBOL(vfs_link);
/*
* Hardlinks are often used in delicate situations. We avoid
@@ -4152,6 +4173,7 @@ out:
return error;
}
+EXPORT_SYMBOL(vfs_rename);
SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname, unsigned int, flags)
@@ -4304,11 +4326,9 @@ SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newna
return sys_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
-int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link)
+int readlink_copy(char __user *buffer, int buflen, const char *link)
{
- int len;
-
- len = PTR_ERR(link);
+ int len = PTR_ERR(link);
if (IS_ERR(link))
goto out;
@@ -4320,6 +4340,7 @@ int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const c
out:
return len;
}
+EXPORT_SYMBOL(readlink_copy);
/*
* A helper for ->readlink(). This should be used *ONLY* for symlinks that
@@ -4337,11 +4358,12 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
if (IS_ERR(cookie))
return PTR_ERR(cookie);
- res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
+ res = readlink_copy(buffer, buflen, nd_get_link(&nd));
if (dentry->d_inode->i_op->put_link)
dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
return res;
}
+EXPORT_SYMBOL(generic_readlink);
/* get the link contents into pagecache */
static char *page_getlink(struct dentry * dentry, struct page **ppage)
@@ -4361,14 +4383,14 @@ static char *page_getlink(struct dentry * dentry, struct page **ppage)
int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct page *page = NULL;
- char *s = page_getlink(dentry, &page);
- int res = vfs_readlink(dentry,buffer,buflen,s);
+ int res = readlink_copy(buffer, buflen, page_getlink(dentry, &page));
if (page) {
kunmap(page);
page_cache_release(page);
}
return res;
}
+EXPORT_SYMBOL(page_readlink);
void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
{
@@ -4376,6 +4398,7 @@ void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
nd_set_link(nd, page_getlink(dentry, &page));
return page;
}
+EXPORT_SYMBOL(page_follow_link_light);
void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
@@ -4386,6 +4409,7 @@ void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
page_cache_release(page);
}
}
+EXPORT_SYMBOL(page_put_link);
/*
* The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
@@ -4423,45 +4447,18 @@ retry:
fail:
return err;
}
+EXPORT_SYMBOL(__page_symlink);
int page_symlink(struct inode *inode, const char *symname, int len)
{
return __page_symlink(inode, symname, len,
!(mapping_gfp_mask(inode->i_mapping) & __GFP_FS));
}
+EXPORT_SYMBOL(page_symlink);
const struct inode_operations page_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
};
-
-EXPORT_SYMBOL(user_path_at);
-EXPORT_SYMBOL(follow_down_one);
-EXPORT_SYMBOL(follow_down);
-EXPORT_SYMBOL(follow_up);
-EXPORT_SYMBOL(get_write_access); /* nfsd */
-EXPORT_SYMBOL(lock_rename);
-EXPORT_SYMBOL(lookup_one_len);
-EXPORT_SYMBOL(page_follow_link_light);
-EXPORT_SYMBOL(page_put_link);
-EXPORT_SYMBOL(page_readlink);
-EXPORT_SYMBOL(__page_symlink);
-EXPORT_SYMBOL(page_symlink);
EXPORT_SYMBOL(page_symlink_inode_operations);
-EXPORT_SYMBOL(kern_path);
-EXPORT_SYMBOL(vfs_path_lookup);
-EXPORT_SYMBOL(inode_permission);
-EXPORT_SYMBOL(unlock_rename);
-EXPORT_SYMBOL(vfs_create);
-EXPORT_SYMBOL(vfs_link);
-EXPORT_SYMBOL(vfs_mkdir);
-EXPORT_SYMBOL(vfs_mknod);
-EXPORT_SYMBOL(generic_permission);
-EXPORT_SYMBOL(vfs_readlink);
-EXPORT_SYMBOL(vfs_rename);
-EXPORT_SYMBOL(vfs_rmdir);
-EXPORT_SYMBOL(vfs_symlink);
-EXPORT_SYMBOL(vfs_unlink);
-EXPORT_SYMBOL(dentry_unhash);
-EXPORT_SYMBOL(generic_readlink);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-12 06:14:39 +0000