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-rw-r--r--security/selinux/hooks.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ebee467e2913..a03fd74602b4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2999,13 +2999,15 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
return file_has_perm(cred, file, av);
}
+static int default_noexec;
+
static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
{
const struct cred *cred = current_cred();
int rc = 0;
-#ifndef CONFIG_PPC32
- if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
+ if (default_noexec &&
+ (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
/*
* We are making executable an anonymous mapping or a
* private file mapping that will also be writable.
@@ -3015,7 +3017,6 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared
if (rc)
goto error;
}
-#endif
if (file) {
/* read access is always possible with a mapping */
@@ -3076,8 +3077,8 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
if (selinux_checkreqprot)
prot = reqprot;
-#ifndef CONFIG_PPC32
- if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
+ if (default_noexec &&
+ (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
int rc = 0;
if (vma->vm_start >= vma->vm_mm->start_brk &&
vma->vm_end <= vma->vm_mm->brk) {
@@ -3099,7 +3100,6 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
if (rc)
return rc;
}
-#endif
return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
}
@@ -5662,6 +5662,8 @@ static __init int selinux_init(void)
/* Set the security state for the initial task. */
cred_init_security();
+ default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
+
sel_inode_cache = kmem_cache_create("selinux_inode_security",
sizeof(struct inode_security_struct),
0, SLAB_PANIC, NULL);