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authorCatalin Marinas <catalin.marinas@arm.com>2014-05-16 17:44:32 +0200
committerCatalin Marinas <catalin.marinas@arm.com>2014-05-16 17:44:32 +0200
commit5a0fdfada3a2aa50d7b947a2e958bf00cbe0d830 (patch)
tree69ae10dd39df9e8de4edd1049d4dafe1436dd37e /arch/arm64/mm
parentMerge tag 'for-3.16' of git://git.linaro.org/people/ard.biesheuvel/linux-arm ... (diff)
downloadlinux-5a0fdfada3a2aa50d7b947a2e958bf00cbe0d830.tar.xz
linux-5a0fdfada3a2aa50d7b947a2e958bf00cbe0d830.zip
Revert "arm64: Introduce execute-only page access permissions"
This reverts commit bc07c2c6e9ed125d362af0214b6313dca180cb08. While the aim is increased security for --x memory maps, it does not protect against kernel level reads. Until SECCOMP is implemented for arm64, revert this patch to avoid giving a false idea of execute-only mappings. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/fault.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 89c6763d5e7e..bcc965e2cce1 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -173,7 +173,8 @@ static int __do_page_fault(struct mm_struct *mm, unsigned long addr,
good_area:
/*
* Check that the permissions on the VMA allow for the fault which
- * occurred.
+ * occurred. If we encountered a write or exec fault, we must have
+ * appropriate permissions, otherwise we allow any permission.
*/
if (!(vma->vm_flags & vm_flags)) {
fault = VM_FAULT_BADACCESS;
@@ -195,7 +196,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
struct task_struct *tsk;
struct mm_struct *mm;
int fault, sig, code;
- unsigned long vm_flags = VM_READ | VM_WRITE;
+ unsigned long vm_flags = VM_READ | VM_WRITE | VM_EXEC;
unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
tsk = current;