diff options
| author | Adrian Reber <areber@redhat.com> | 2020-07-19 12:04:14 +0200 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2020-07-19 20:14:42 +0200 |
| commit | 12886f8ab10ce6a09af1d92535d49c81aaa215a8 (patch) | |
| tree | 5216c20df0841870c59b86e55c52d5860d948900 /fs | |
| parent | pid_namespace: use checkpoint_restore_ns_capable() for ns_last_pid (diff) | |
| download | linux-12886f8ab10ce6a09af1d92535d49c81aaa215a8.tar.xz linux-12886f8ab10ce6a09af1d92535d49c81aaa215a8.zip | |
proc: allow access in init userns for map_files with CAP_CHECKPOINT_RESTORE
Opening files in /proc/pid/map_files when the current user is
CAP_CHECKPOINT_RESTORE capable in the root namespace is useful for
checkpointing and restoring to recover files that are unreachable via
the file system such as deleted files, or memfd files.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Nicolas Viennot <Nicolas.Viennot@twosigma.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Link: https://lore.kernel.org/r/20200719100418.2112740-5-areber@redhat.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index d86c0afc8a85..a333caeca291 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2189,16 +2189,16 @@ struct map_files_info { }; /* - * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the - * symlinks may be used to bypass permissions on ancestor directories in the - * path to the file in question. + * Only allow CAP_SYS_ADMIN and CAP_CHECKPOINT_RESTORE to follow the links, due + * to concerns about how the symlinks may be used to bypass permissions on + * ancestor directories in the path to the file in question. */ static const char * proc_map_files_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done) { - if (!capable(CAP_SYS_ADMIN)) + if (!checkpoint_restore_ns_capable(&init_user_ns)) return ERR_PTR(-EPERM); return proc_pid_get_link(dentry, inode, done); |