diff options
Diffstat (limited to 'security/landlock/fs.c')
| -rw-r--r-- | security/landlock/fs.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/security/landlock/fs.c b/security/landlock/fs.c index 7b7860039a08..30b42cdee52e 100644 --- a/security/landlock/fs.c +++ b/security/landlock/fs.c @@ -622,10 +622,12 @@ static int hook_path_link(struct dentry *const old_dentry, static int hook_path_rename(const struct path *const old_dir, struct dentry *const old_dentry, const struct path *const new_dir, - struct dentry *const new_dentry) + struct dentry *const new_dentry, + const unsigned int flags) { const struct landlock_ruleset *const dom = landlock_get_current_domain(); + u32 exchange_access = 0; if (!dom) return 0; @@ -633,12 +635,19 @@ static int hook_path_rename(const struct path *const old_dir, if (old_dir->dentry != new_dir->dentry) /* Gracefully forbids reparenting. */ return -EXDEV; + if (flags & RENAME_EXCHANGE) { + if (unlikely(d_is_negative(new_dentry))) + return -ENOENT; + exchange_access = + get_mode_access(d_backing_inode(new_dentry)->i_mode); + } if (unlikely(d_is_negative(old_dentry))) return -ENOENT; /* RENAME_EXCHANGE is handled because directories are the same. */ return check_access_path( dom, old_dir, maybe_remove(old_dentry) | maybe_remove(new_dentry) | + exchange_access | get_mode_access(d_backing_inode(old_dentry)->i_mode)); } |