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namei: allow nd_jump_link() to produce errors

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In preparation for LOOKUP_NO_MAGICLINKS, it's necessary to add the
ability for nd_jump_link() to return an error which the corresponding
get_link() caller must propogate back up to the VFS.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Aleksa Sarai
2019-12-07 01:13:28 +11:00
committed by Al Viro
parent ce623f8987
commit 1bc82070fa
5 changed files with 17 additions and 11 deletions
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6
security/apparmor/apparmorfs.c
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@@ -2573,16 +2573,18 @@ static const char *policy_get_link(struct dentry *dentry,
{
struct aa_ns *ns;
struct path path;
int error;
if (!dentry)
return ERR_PTR(-ECHILD);
ns = aa_get_current_ns();
path.mnt = mntget(aafs_mnt);
path.dentry = dget(ns_dir(ns));
nd_jump_link(&path);
error = nd_jump_link(&path);
aa_put_ns(ns);
return NULL;
return ERR_PTR(error);
}
static int policy_readlink(struct dentry *dentry, char __user *buffer,