MIPS: VPE: Fix build after the credential changes a while ago.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 23 insertions, 10 deletions

diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index f2397f00db43..ad4e017ed2f3 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -172,13 +172,20 @@ static unsigned int translate_open_flags(int flags)
 }
 
 
-static void sp_setfsuidgid( uid_t uid, gid_t gid)
+static int sp_setfsuidgid(uid_t uid, gid_t gid)
 {
-        current->cred->fsuid = uid;
-        current->cred->fsgid = gid;
+        struct cred *new;
 
-        key_fsuid_changed(current);
-        key_fsgid_changed(current);
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+
+        new->fsuid = uid;
+        new->fsgid = gid;
+
+        commit_creds(new);
+
+        return 0;
 }
 
 /*
@@ -196,7 +203,7 @@ void sp_work_handle_request(void)
         mm_segment_t old_fs;
         struct timeval tv;
         struct timezone tz;
-        int cmd;
+        int err, cmd;
 
         char *vcwd;
         int size;
@@ -225,8 +232,11 @@ void sp_work_handle_request(void)
         /* Run the syscall at the privilege of the user who loaded the
            SP program */
 
-        if (vpe_getuid(tclimit))
-                sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));
+        if (vpe_getuid(tclimit)) {
+                err = sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));
+                if (!err)
+                        pr_err("Change of creds failed\n");
+        }
 
         switch (sc.cmd) {
         /* needs the flags argument translating from SDE kit to
@@ -283,8 +293,11 @@ void sp_work_handle_request(void)
                 break;
         } /* switch */
 
-        if (vpe_getuid(tclimit))
-                sp_setfsuidgid( 0, 0);
+        if (vpe_getuid(tclimit)) {
+                err = sp_setfsuidgid(0, 0);
+                if (!err)
+                        pr_err("restoring old creds failed\n");
+        }
 
         old_fs = get_fs();
         set_fs(KERNEL_DS);