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mm: smaps: Report arm64 guarded pages in smaps

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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: Mark Brown <broonie@kernel.org>
Signed-off-by: Daniel Kiss <daniel.kiss@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Daniel Kiss 2020-03-16 16:50:54 +00:00 committed by Catalin Marinas
parent de48bb3692
commit 424037b775
2 changed files with 4 additions and 0 deletions
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1
Documentation/filesystems/proc.txt
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@ -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

3
fs/proc/task_mmu.c
View File

@ -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