1 files changed, 10 insertions, 5 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 1e8efdc80412..52c9e2ff6e6b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1139,7 +1139,7 @@ void setup_new_exec(struct linux_binprm * bprm)
         /* This is the point of no return */
         current->sas_ss_sp = current->sas_ss_size = 0;
 
-        if (current_euid() == current_uid() && current_egid() == current_gid())
+        if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))
                 set_dumpable(current->mm, 1);
         else
                 set_dumpable(current->mm, suid_dumpable);
@@ -1153,8 +1153,8 @@ void setup_new_exec(struct linux_binprm * bprm)
         current->mm->task_size = TASK_SIZE;
 
         /* install the new credentials */
-        if (bprm->cred->uid != current_euid() ||
-            bprm->cred->gid != current_egid()) {
+        if (!uid_eq(bprm->cred->uid, current_euid()) ||
+            !gid_eq(bprm->cred->gid, current_egid())) {
                 current->pdeath_signal = 0;
         } else {
                 would_dump(bprm, bprm->file);
@@ -1299,8 +1299,11 @@ int prepare_binprm(struct linux_binprm *bprm)
             !current->no_new_privs) {
                 /* Set-uid? */
                 if (mode & S_ISUID) {
+                        if (!kuid_has_mapping(bprm->cred->user_ns, inode->i_uid))
+                                return -EPERM;
                         bprm->per_clear |= PER_CLEAR_ON_SETID;
                         bprm->cred->euid = inode->i_uid;
+
                 }
 
                 /* Set-gid? */
@@ -1310,6 +1313,8 @@ int prepare_binprm(struct linux_binprm *bprm)
                  * executable.
                  */
                 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
+                        if (!kgid_has_mapping(bprm->cred->user_ns, inode->i_gid))
+                                return -EPERM;
                         bprm->per_clear |= PER_CLEAR_ON_SETID;
                         bprm->cred->egid = inode->i_gid;
                 }
@@ -2142,7 +2147,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
         if (__get_dumpable(cprm.mm_flags) == 2) {
                 /* Setuid core dump mode */
                 flag = O_EXCL;          /* Stop rewrite attacks */
-                cred->fsuid = 0;        /* Dump root private */
+                cred->fsuid = GLOBAL_ROOT_UID;  /* Dump root private */
         }
 
         retval = coredump_wait(exit_code, &core_state);
@@ -2243,7 +2248,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
                  * Dont allow local users get cute and trick others to coredump
                  * into their pre-created files.
                  */
-                if (inode->i_uid != current_fsuid())
+                if (!uid_eq(inode->i_uid, current_fsuid()))
                         goto close_fail;
                 if (!cprm.file->f_op || !cprm.file->f_op->write)
                         goto close_fail;