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-rw-r--r--fs/exec.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 1e8efdc..52c9e2f 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;
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