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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 14:19:23 +0100
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 14:27:16 +0100
commit0558c1bf5a0811bf5e3753eed911a15b9bd08271 (patch)
treebbaad2c11479beaac5328c5c3eb33241f9b3cc45 /fs/inode.c
parent02f92b3868a1b34ab98464e76b0e4e060474ba10 (diff)
capability: handle idmapped mounts
In order to determine whether a caller holds privilege over a given inode the capability framework exposes the two helpers privileged_wrt_inode_uidgid() and capable_wrt_inode_uidgid(). The former verifies that the inode has a mapping in the caller's user namespace and the latter additionally verifies that the caller has the requested capability in their current user namespace. If the inode is accessed through an idmapped mount map it into the mount's user namespace. Afterwards the checks are identical to non-idmapped inodes. If the initial user namespace is passed all operations are a nop so non-idmapped mounts will not see a change in behavior. Link: https://lore.kernel.org/r/20210121131959.646623-5-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 6442d97d9a4a..cd40cbf87ce4 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2146,7 +2146,8 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
mode |= S_ISGID;
else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
!in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(dir, CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, dir,
+ CAP_FSETID))
mode &= ~S_ISGID;
} else
inode->i_gid = current_fsgid();