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Date:	Thu, 18 Feb 2016 12:24:25 -0800
From:	tip-bot for Dave Hansen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	ldufour@...ux.vnet.ibm.com, dave.hansen@...ux.intel.com,
	vbabka@...e.cz, bp@...e.de, riel@...hat.com, jmarchan@...hat.com,
	dave@...1.net, koct9i@...il.com, peterz@...radead.org,
	hannes@...xchg.org, mwilliamson@...o-software.com,
	brgerst@...il.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, bp@...en8.de,
	viro@...iv.linux.org.uk, pbonzini@...hat.com, luto@...capital.net,
	bhe@...hat.com, msalter@...hat.com, mingo@...nel.org,
	mhocko@...e.com, n-horiguchi@...jp.nec.com,
	kirill.shutemov@...ux.intel.com, jkosina@...e.cz,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	jroedel@...e.de, dvlasenk@...hat.com, dyoung@...hat.com
Subject: [tip:mm/pkeys] x86/mm/pkeys: Dump pkey from VMA in /proc/pid/
 smaps

Commit-ID:  c1192f8428414679c8126180e690f8daa1d4d98a
Gitweb:     http://git.kernel.org/tip/c1192f8428414679c8126180e690f8daa1d4d98a
Author:     Dave Hansen <dave.hansen@...ux.intel.com>
AuthorDate: Fri, 12 Feb 2016 13:02:27 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 18 Feb 2016 19:46:29 +0100

x86/mm/pkeys: Dump pkey from VMA in /proc/pid/smaps

The protection key can now be just as important as read/write
permissions on a VMA.  We need some debug mechanism to help
figure out if it is in play.  smaps seems like a logical
place to expose it.

arch/x86/kernel/setup.c is a bit of a weirdo place to put
this code, but it already had seq_file.h and there was not
a much better existing place to put it.

We also use no #ifdef.  If protection keys is .config'd out we
will effectively get the same function as if we used the weak
generic function.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Baoquan He <bhe@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Borislav Petkov <bp@...e.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave@...1.net>
Cc: Dave Young <dyoung@...hat.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jerome Marchand <jmarchan@...hat.com>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mark Salter <msalter@...hat.com>
Cc: Mark Williamson <mwilliamson@...o-software.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/20160212210227.4F8EB3F8@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/setup.c |  9 +++++++++
 fs/proc/task_mmu.c      | 14 ++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d3d80e6..7260f99 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -112,6 +112,7 @@
 #include <asm/alternative.h>
 #include <asm/prom.h>
 #include <asm/microcode.h>
+#include <asm/mmu_context.h>
 
 /*
  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
@@ -1282,3 +1283,11 @@ static int __init register_kernel_offset_dumper(void)
 	return 0;
 }
 __initcall(register_kernel_offset_dumper);
+
+void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
+{
+	if (!boot_cpu_has(X86_FEATURE_OSPKE))
+		return;
+
+	seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
+}
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index fa95ab2..9df4316 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -660,11 +660,20 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 		[ilog2(VM_MERGEABLE)]	= "mg",
 		[ilog2(VM_UFFD_MISSING)]= "um",
 		[ilog2(VM_UFFD_WP)]	= "uw",
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+		/* These come out via ProtectionKey: */
+		[ilog2(VM_PKEY_BIT0)]	= "",
+		[ilog2(VM_PKEY_BIT1)]	= "",
+		[ilog2(VM_PKEY_BIT2)]	= "",
+		[ilog2(VM_PKEY_BIT3)]	= "",
+#endif
 	};
 	size_t i;
 
 	seq_puts(m, "VmFlags: ");
 	for (i = 0; i < BITS_PER_LONG; i++) {
+		if (!mnemonics[i][0])
+			continue;
 		if (vma->vm_flags & (1UL << i)) {
 			seq_printf(m, "%c%c ",
 				   mnemonics[i][0], mnemonics[i][1]);
@@ -702,6 +711,10 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
 }
 #endif /* HUGETLB_PAGE */
 
+void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
+{
+}
+
 static int show_smap(struct seq_file *m, void *v, int is_pid)
 {
 	struct vm_area_struct *vma = v;
@@ -783,6 +796,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 		   (vma->vm_flags & VM_LOCKED) ?
 			(unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
 
+	arch_show_smap(m, vma);
 	show_smap_vma_flags(m, vma);
 	m_cache_vma(m, vma);
 	return 0;

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