[PATCH 2/3 v3] kernel: Move groups_sort to the caller of set_groups.

[Thiago Rafael Becker]

The responsibility for calling groups_sort is now on the caller
of set_groups.

Signed-off-by: Thiago Rafael Becker <thiago.bec...@gmail.com>
---
 fs/nfsd/auth.c                    | 3 +++
 kernel/groups.c                   | 1 +
 kernel/uid16.c                    | 1 +
 net/sunrpc/auth_gss/gss_rpc_xdr.c | 1 +
 net/sunrpc/auth_gss/svcauth_gss.c | 1 +
 net/sunrpc/svcauth_unix.c         | 8 ++++++++
 6 files changed, 15 insertions(+)

diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 697f8ae..7b5099b 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -60,6 +60,9 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export 
*exp)
                                gi->gid[i] = exp->ex_anon_gid;
                        else
                                gi->gid[i] = rqgi->gid[i];
+
+                       /* Should be race free as long as each thread allocates 
a new gi */
+                       groups_sort(gi);
                }
        } else {
                gi = get_group_info(rqgi);
diff --git a/kernel/groups.c b/kernel/groups.c
index 4c9c9ed..17073a9 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -208,6 +208,7 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, 
grouplist)
                return retval;
        }
 
+       groups_sort(group_info);
        retval = set_current_groups(group_info);
        put_group_info(group_info);
 
diff --git a/kernel/uid16.c b/kernel/uid16.c
index ce74a49..ef1da2a 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -192,6 +192,7 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t 
__user *, grouplist)
                return retval;
        }
 
+       groups_sort(group_info);
        retval = set_current_groups(group_info);
        put_group_info(group_info);
 
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c 
b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index c4778ca..444380f 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -231,6 +231,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
                        goto out_free_groups;
                creds->cr_group_info->gid[i] = kgid;
        }
+       groups_sort(creds->cr_group_info);
 
        return 0;
 out_free_groups:
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c 
b/net/sunrpc/auth_gss/svcauth_gss.c
index 5dd4e6c..2653119 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -481,6 +481,7 @@ static int rsc_parse(struct cache_detail *cd,
                                goto out;
                        rsci.cred.cr_group_info->gid[i] = kgid;
                }
+               groups_sort(rsci.cred.cr_group_info);
 
                /* mech name */
                len = qword_get(&mesg, buf, mlen);
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 740b67d..99841e1 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -20,6 +20,7 @@
 
 
 #include "netns.h"
+void groups_sort(struct group_info *group_info);
 
 /*
  * AUTHUNIX and AUTHNULL credentials are both handled here.
@@ -520,6 +521,12 @@ static int unix_gid_parse(struct cache_detail *cd,
                ug.gi->gid[i] = kgid;
        }
 
+       /* Sort the groups before inserting this entry
+        * into the cache to avoid future corrutpions
+        * by multiple simultaneous attempts to sort this
+        * entry.
+        */
+       groups_sort(ug.gi);
        ugp = unix_gid_lookup(cd, uid);
        if (ugp) {
                struct cache_head *ch;
@@ -819,6 +826,7 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
                kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
                cred->cr_group_info->gid[i] = kgid;
        }
+       groups_sort(cred->cr_group_info);
        if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
                *authp = rpc_autherr_badverf;
                return SVC_DENIED;
-- 
2.9.5