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From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: "Alexander Viro" <viro@zeniv.linux.org.uk>,
	"Paul Elliott" <paul.elliott@arm.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Yu-cheng Yu" <yu-cheng.yu@intel.com>,
	"Amit Kachhap" <amit.kachhap@arm.com>,
	"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
	"Marc Zyngier" <maz@kernel.org>,
	"Eugene Syromiatnikov" <esyr@redhat.com>,
	"Szabolcs Nagy" <szabolcs.nagy@arm.com>,
	"H . J . Lu " <hjl.tools@gmail.com>,
	"Andrew Jones" <drjones@redhat.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Arnd Bergmann" <arnd@arndb.de>, "Jann Horn" <jannh@google.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Kristina Martšenko" <kristina.martsenko@arm.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Florian Weimer" <fweimer@redhat.com>,
	"Sudakshina Das" <sudi.das@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	"Daniel Kiss" <daniel.kiss@arm.com>,
	"Mark Brown" <broonie@kernel.org>
Subject: [PATCH v9 12/13] mm: smaps: Report arm64 guarded pages in smaps
Date: Wed, 11 Mar 2020 19:26:07 +0000	[thread overview]
Message-ID: <20200311192608.40095-13-broonie@kernel.org> (raw)
In-Reply-To: <20200311192608.40095-1-broonie@kernel.org>

From: Daniel Kiss <daniel.kiss@arm.com>

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: Daniel Kiss <daniel.kiss@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/filesystems/proc.txt | 1 +
 fs/proc/task_mmu.c                 | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 99ca040e3f90..ed5465d0f435 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -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
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3ba9ae83bff5..1e3409c484d1 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -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
-- 
2.20.1


  parent reply	other threads:[~2020-03-11 19:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 19:25 [PATCH v9 00/13] arm64: Branch Target Identification support Mark Brown
2020-03-11 19:25 ` [PATCH v9 01/13] ELF: UAPI and Kconfig additions for ELF program properties Mark Brown
2020-03-11 19:25 ` [PATCH v9 02/13] ELF: Add ELF program property parsing support Mark Brown
2020-03-12 23:59   ` Kees Cook
2020-03-13 11:55     ` Mark Brown
2020-03-11 19:25 ` [PATCH v9 03/13] arm64: Basic Branch Target Identification support Mark Brown
2020-03-11 19:25 ` [PATCH v9 04/13] elf: Allow arch to tweak initial mmap prot flags Mark Brown
2020-03-11 19:26 ` [PATCH v9 05/13] arm64: elf: Enable BTI at exec based on ELF program properties Mark Brown
2020-03-11 19:26 ` [PATCH v9 06/13] arm64: BTI: Decode BYTPE bits when printing PSTATE Mark Brown
2020-03-11 19:26 ` [PATCH v9 07/13] arm64: unify native/compat instruction skipping Mark Brown
2020-03-11 19:26 ` [PATCH v9 08/13] arm64: traps: Shuffle code to eliminate forward declarations Mark Brown
2020-03-14 11:18   ` Catalin Marinas
2020-03-11 19:26 ` [PATCH v9 09/13] arm64: BTI: Reset BTYPE when skipping emulated instructions Mark Brown
2020-03-11 19:26 ` [PATCH v9 10/13] KVM: " Mark Brown
2020-03-11 19:26 ` [PATCH v9 11/13] arm64: mm: Display guarded pages in ptdump Mark Brown
2020-03-11 19:26 ` Mark Brown [this message]
2020-03-13  0:00   ` [PATCH v9 12/13] mm: smaps: Report arm64 guarded pages in smaps Kees Cook
2020-03-11 19:26 ` [PATCH v9 13/13] arm64: BTI: Add Kconfig entry for userspace BTI Mark Brown
2020-03-13  0:01   ` Kees Cook

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