Commit 424037b7 authored by Daniel Kiss's avatar Daniel Kiss Committed by Catalin Marinas
Browse files

mm: smaps: Report arm64 guarded pages in smaps 



The arm64 Branch Target Identification support is activated by marking
executable pages as guarded pages.  Report pages mapped this way in
smaps to aid diagnostics.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarDaniel Kiss <daniel.kiss@arm.com>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent de48bb36

Documentation/filesystems/proc.txt

+1 −0
Original line number Diff line number Diff line
@@ -519,6 +519,7 @@ manner. The codes are the following: 
    hg  - huge page advise flag

    nh  - no-huge page advise flag

    mg  - mergable advise flag

    bt  - arm64 BTI guarded page



Note that there is no guarantee that every flag and associated mnemonic will

be present in all further kernel releases. Things get changed, the flags may

fs/proc/task_mmu.c

+3 −0
Original line number Diff line number Diff line
@@ -668,6 +668,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) 
		[ilog2(VM_ARCH_1)]	= "ar",

		[ilog2(VM_WIPEONFORK)]	= "wf",

		[ilog2(VM_DONTDUMP)]	= "dd",

#ifdef CONFIG_ARM64_BTI

		[ilog2(VM_ARM64_BTI)]	= "bt",

#endif

#ifdef CONFIG_MEM_SOFT_DIRTY

		[ilog2(VM_SOFTDIRTY)]	= "sd",

#endif