afs: Fix accessing YFS xattrs on a non-YFS server

If someone attempts to access YFS-related xattrs (e.g. afs.yfs.acl) on a
file on a non-YFS AFS server (such as OpenAFS), then the kernel will jump
to a NULL function pointer because the afs_fetch_acl_operation descriptor
doesn't point to a function for issuing an operation on a non-YFS
server[1].

Fix this by making afs_wait_for_operation() check that the issue_afs_rpc
method is set before jumping to it and setting -ENOTSUPP if not.  This fix
also covers other potential operations that also only exist on YFS servers.

afs_xattr_get/set_yfs() then need to translate -ENOTSUPP to -ENODATA as the
former error is internal to the kernel.

The bug shows up as an oops like the following:

	BUG: kernel NULL pointer dereference, address: 0000000000000000
	[...]
	Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
	[...]
	Call Trace:
	 afs_wait_for_operation+0x83/0x1b0 [kafs]
	 afs_xattr_get_yfs+0xe6/0x270 [kafs]
	 __vfs_getxattr+0x59/0x80
	 vfs_getxattr+0x11c/0x140
	 getxattr+0x181/0x250
	 ? __check_object_size+0x13f/0x150
	 ? __fput+0x16d/0x250
	 __x64_sys_fgetxattr+0x64/0xb0
	 do_syscall_64+0x49/0xc0
	 entry_SYSCALL_64_after_hwframe+0x44/0xa9
	RIP: 0033:0x7fb120a9defe

This was triggered with "cp -a" which attempts to copy xattrs, including
afs ones, but is easier to reproduce with getfattr, e.g.:

	getfattr -d -m ".*" /afs/openafs.org/

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Reported-by: Gaja Sophie Peters <gaja.peters@math.uni-hamburg.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Gaja Sophie Peters <gaja.peters@math.uni-hamburg.de>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
cc: linux-afs@lists.infradead.org
Link: http://lists.infradead.org/pipermail/linux-afs/2021-March/003498.html
Link: http://lists.infradead.org/pipermail/linux-afs/2021-March/003566.html
Link: http://lists.infradead.org/pipermail/linux-afs/2021-March/003572.html

diff --git a/fs/afs/fs_operation.c b/fs/afs/fs_operation.c
index 97cab12..71c5872 100644 (file)
--- a/fs/afs/fs_operation.c
+++ b/fs/afs/fs_operation.c
@@ -181,10 +181,13 @@ void afs_wait_for_operation(struct afs_operation *op)
                if (test_bit(AFS_SERVER_FL_IS_YFS, &op->server->flags) &&
                    op->ops->issue_yfs_rpc)
                        op->ops->issue_yfs_rpc(op);
-               else
+               else if (op->ops->issue_afs_rpc)
                        op->ops->issue_afs_rpc(op);
+               else
+                       op->ac.error = -ENOTSUPP;
 
-               op->error = afs_wait_for_call_to_complete(op->call, &op->ac);
+               if (op->call)
+                       op->error = afs_wait_for_call_to_complete(op->call, &op->ac);
        }
 
        switch (op->error) {

diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c
index c629caa..4934e32 100644 (file)
--- a/fs/afs/xattr.c
+++ b/fs/afs/xattr.c
@@ -231,6 +231,8 @@ static int afs_xattr_get_yfs(const struct xattr_handler *handler,
                        else
                                ret = -ERANGE;
                }
+       } else if (ret == -ENOTSUPP) {
+               ret = -ENODATA;
        }
 
 error_yacl:
@@ -256,6 +258,7 @@ static int afs_xattr_set_yfs(const struct xattr_handler *handler,
 {
        struct afs_operation *op;
        struct afs_vnode *vnode = AFS_FS_I(inode);
+       int ret;
 
        if (flags == XATTR_CREATE ||
            strcmp(name, "acl") != 0)
@@ -270,7 +273,10 @@ static int afs_xattr_set_yfs(const struct xattr_handler *handler,
                return afs_put_operation(op);
 
        op->ops = &yfs_store_opaque_acl2_operation;
-       return afs_do_sync_operation(op);
+       ret = afs_do_sync_operation(op);
+       if (ret == -ENOTSUPP)
+               ret = -ENODATA;
+       return ret;
 }
 
 static const struct xattr_handler afs_xattr_yfs_handler = {