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Fix user namespaces uid/gid mapping 

As described in torvalds/linux@5f3a4a2 the &init_user_ns, and
not the current user_ns, should be passed to posix_acl_from_xattr()
and posix_acl_to_xattr().  Conveniently the init_user_ns is
available through the init credential (kcred).


Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Massimo Maggi <me@massimo-maggi.eu>
Closes #4177
This commit is contained in:
Brian Behlendorf 2016-04-30 12:21:51 -07:00
parent 1ab3678b5d
commit 874bd959f4
1 changed files with 4 additions and 4 deletions
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8
include/linux/xattr_compat.h
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@ -190,20 +190,20 @@ fn(struct inode *ip, const char *name, const void *buffer, \
/*
* Linux 3.7 API change. posix_acl_{from,to}_xattr gained the user_ns
* parameter. For the HAVE_POSIX_ACL_FROM_XATTR_USERNS version the
* userns _may_ not be correct because it's used outside the RCU.
* parameter. All callers are expected to pass the &init_user_ns which
* is available through the init credential (kcred).
*/
#ifdef HAVE_POSIX_ACL_FROM_XATTR_USERNS
static inline struct posix_acl *
zpl_acl_from_xattr(const void *value, int size)
{
return (posix_acl_from_xattr(CRED()->user_ns, value, size));
return (posix_acl_from_xattr(kcred->user_ns, value, size));
}
static inline int
zpl_acl_to_xattr(struct posix_acl *acl, void *value, int size)
{
return (posix_acl_to_xattr(CRED()->user_ns, acl, value, size));
return (posix_acl_to_xattr(kcred->user_ns, acl, value, size));
}
#else