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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 16:19:24 +0300
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 16:27:16 +0300
commit47291baa8ddfdae10663624ff0a15ab165952708 (patch)
tree132a9486b82c5eada1c4b375f693522f0a04d629 /kernel/bpf/inode.c
parent0558c1bf5a0811bf5e3753eed911a15b9bd08271 (diff)
downloadlinux-47291baa8ddfdae10663624ff0a15ab165952708.tar.xz
namei: make permission helpers idmapped mount aware
The two helpers inode_permission() and generic_permission() are used by the vfs to perform basic permission checking by verifying that the caller is privileged over an inode. In order to handle idmapped mounts we extend the two helpers with an additional user namespace argument. On idmapped mounts the two helpers will make sure to map the inode according to the mount's user namespace and then peform identical permission checks to inode_permission() and generic_permission(). If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Link: https://lore.kernel.org/r/20210121131959.646623-6-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 'kernel/bpf/inode.c')
-rw-r--r--kernel/bpf/inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 8962f139521e..e3226b65f5dc 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -558,7 +558,7 @@ int bpf_obj_get_user(const char __user *pathname, int flags)
static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type type)
{
struct bpf_prog *prog;
- int ret = inode_permission(inode, MAY_READ);
+ int ret = inode_permission(&init_user_ns, inode, MAY_READ);
if (ret)
return ERR_PTR(ret);