Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932730AbbLNTJk (ORCPT ); Mon, 14 Dec 2015 14:09:40 -0500 Received: from mga09.intel.com ([134.134.136.24]:60185 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932539AbbLNTGX (ORCPT ); Mon, 14 Dec 2015 14:06:23 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,428,1444719600"; d="scan'208";a="873444662" Subject: [PATCH 22/32] x86, pkeys: dump PTE pkey in /proc/pid/smaps To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, Dave Hansen , dave.hansen@linux.intel.com From: Dave Hansen Date: Mon, 14 Dec 2015 11:06:19 -0800 References: <20151214190542.39C4886D@viggo.jf.intel.com> In-Reply-To: <20151214190542.39C4886D@viggo.jf.intel.com> Message-Id: <20151214190619.BA65327A@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3097 Lines: 96 From: Dave Hansen 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 get the same function as if we used the weak generic function. Signed-off-by: Dave Hansen Reviewed-by: Thomas Gleixner --- b/arch/x86/kernel/setup.c | 9 +++++++++ b/fs/proc/task_mmu.c | 14 ++++++++++++++ 2 files changed, 23 insertions(+) diff -puN arch/x86/kernel/setup.c~pkeys-40-smaps arch/x86/kernel/setup.c --- a/arch/x86/kernel/setup.c~pkeys-40-smaps 2015-12-14 10:42:48.777070739 -0800 +++ b/arch/x86/kernel/setup.c 2015-12-14 10:42:48.782070963 -0800 @@ -112,6 +112,7 @@ #include #include #include +#include /* * max_low_pfn_mapped: highest direct mapped pfn under 4GB @@ -1282,3 +1283,11 @@ static int __init register_kernel_offset 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 -puN fs/proc/task_mmu.c~pkeys-40-smaps fs/proc/task_mmu.c --- a/fs/proc/task_mmu.c~pkeys-40-smaps 2015-12-14 10:42:48.779070829 -0800 +++ b/fs/proc/task_mmu.c 2015-12-14 10:42:48.783071008 -0800 @@ -615,11 +615,20 @@ static void show_smap_vma_flags(struct s [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]); @@ -657,6 +666,10 @@ static int smaps_hugetlb_range(pte_t *pt } #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; @@ -713,6 +726,7 @@ static int show_smap(struct seq_file *m, (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; _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/