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From: Julien Thierry <julien.thierry@arm.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Julien Thierry <julien.thierry@arm.com>,
	peterz@infradead.org, catalin.marinas@arm.com,
	will.deacon@arm.com, mingo@redhat.com, james.morse@arm.com,
	hpa@zytor.com, valentin.schneider@arm.com
Subject: [PATCH v3 4/4] arm64: uaccess: Implement user_access_region_active
Date: Tue, 15 Jan 2019 13:58:29 +0000	[thread overview]
Message-ID: <1547560709-56207-5-git-send-email-julien.thierry@arm.com> (raw)
In-Reply-To: <1547560709-56207-1-git-send-email-julien.thierry@arm.com>

Provide arm64 implementation of user_access_region_active.

Check the status of PAN or SW PAN if needed.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/include/asm/sysreg.h  |  2 ++
 arch/arm64/include/asm/uaccess.h | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 72dc4c0..f0b2f32 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -114,6 +114,8 @@
 #define SYS_DC_CSW			sys_insn(1, 0, 7, 10, 2)
 #define SYS_DC_CISW			sys_insn(1, 0, 7, 14, 2)

+#define SYS_PSTATE_PAN			sys_reg(3, 0, 4, 2, 3)
+
 #define SYS_OSDTRRX_EL1			sys_reg(2, 0, 0, 0, 2)
 #define SYS_MDCCINT_EL1			sys_reg(2, 0, 0, 2, 0)
 #define SYS_MDSCR_EL1			sys_reg(2, 0, 0, 2, 2)
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index 6a70c75..1a8acc9 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h
@@ -225,6 +225,18 @@ static inline void uaccess_enable_not_uao(void)
 	__uaccess_enable(ARM64_ALT_PAN_NOT_UAO);
 }

+#define unsafe_user_region_active	uaccess_region_active
+static inline bool uaccess_region_active(void)
+{
+	if (system_uses_ttbr0_pan()) {
+		return read_sysreg(ttbr1_el1) & TTBR_ASID_MASK;
+	} else if (cpus_have_const_cap(ARM64_ALT_PAN_NOT_UAO) &&
+		   alternatives_applied) {
+		return !read_sysreg_s(SYS_PSTATE_PAN);
+	}
+	return false;
+}
+
 /*
  * Sanitise a uaccess pointer such that it becomes NULL if above the
  * current addr_limit.
--
1.9.1

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  parent reply	other threads:[~2019-01-15 14:12 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-15 13:58 [PATCH v3 0/4] uaccess: Add unsafe accessors for arm64 Julien Thierry
2019-01-15 13:58 ` [PATCH v3 1/4] arm64: uaccess: Cleanup get/put_user() Julien Thierry
2019-01-15 13:58 ` [PATCH v3 2/4] arm64: uaccess: Implement unsafe accessors Julien Thierry
2019-01-15 13:58 ` [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region Julien Thierry
2019-01-30 16:58   ` Valentin Schneider
2019-02-04 13:27     ` Julien Thierry
2019-02-11 13:45   ` Ingo Molnar
2019-02-11 13:51     ` Peter Zijlstra
2019-02-12  9:15       ` Julien Thierry
2019-02-13  8:21         ` Ingo Molnar
2019-02-13 10:35         ` Peter Zijlstra
2019-02-13 10:50           ` Julien Thierry
2019-02-13 13:17             ` Peter Zijlstra
2019-02-13 13:20               ` Peter Zijlstra
2019-02-13 14:00               ` Will Deacon
2019-02-13 14:07                 ` Julien Thierry
2019-02-13 14:17                 ` Peter Zijlstra
2019-02-13 14:24                   ` Julien Thierry
2019-02-13 14:40                     ` Peter Zijlstra
2019-02-13 15:08                       ` Peter Zijlstra
2019-02-13 14:25                 ` Peter Zijlstra
2019-02-13 14:39                   ` Julien Thierry
2019-02-13 14:41                     ` Peter Zijlstra
2019-02-13 15:45                       ` Peter Zijlstra
2019-02-13 18:54                         ` Peter Zijlstra
     [not found]                         ` <D61C430D-4321-4114-AB85-671A3C7B8EAE@amacapital.net>
2019-02-13 22:21                           ` Peter Zijlstra
2019-02-13 22:49                             ` Andy Lutomirski
2019-02-14 10:14                               ` [PATCH] sched/x86: Save [ER]FLAGS on context switch Peter Zijlstra
2019-02-14 16:18                                 ` Brian Gerst
2019-02-14 19:34                                   ` Peter Zijlstra
2019-02-15 14:34                                     ` Brian Gerst
2019-02-15 17:18                                     ` Linus Torvalds
2019-02-15 17:40                                       ` Peter Zijlstra
2019-02-15 18:28                                         ` Andy Lutomirski
2019-02-15 23:34                                         ` Peter Zijlstra
2019-02-16  0:21                                           ` Linus Torvalds
2019-02-16 10:32                                             ` Peter Zijlstra
2019-02-16  4:06                                 ` hpa
2019-02-16 10:30                                   ` Peter Zijlstra
2019-02-18 22:30                                     ` H. Peter Anvin
2019-02-19  0:24                                       ` Linus Torvalds
2019-02-19  2:20                                         ` Andy Lutomirski
2019-02-19  2:46                                           ` H. Peter Anvin
2019-02-19  9:07                                             ` Julien Thierry
2019-02-19  8:53                                         ` Julien Thierry
2019-02-19  9:15                                         ` Peter Zijlstra
2019-02-19  9:19                                           ` Peter Zijlstra
2019-02-19  9:04                                       ` Peter Zijlstra
2019-02-19  9:21                                         ` hpa
2019-02-19  9:44                                         ` Peter Zijlstra
2019-02-19 11:38                                           ` Thomas Gleixner
2019-02-19 11:58                                             ` Peter Zijlstra
2019-02-19 12:48                                         ` Will Deacon
2019-02-20 22:55                                           ` H. Peter Anvin
2019-02-21 12:06                                             ` Julien Thierry
2019-02-21 21:35                                               ` Thomas Gleixner
2019-02-21 22:08                                                 ` Linus Torvalds
2019-02-22 12:58                                                   ` Peter Zijlstra
2019-02-22 18:10                                                   ` Thomas Gleixner
2019-02-22 22:26                                                     ` [RFC][PATCH] objtool: STAC/CLAC validation Peter Zijlstra
2019-02-22 23:34                                                       ` Linus Torvalds
2019-02-23  8:43                                                         ` Peter Zijlstra
2019-02-22 23:39                                                       ` hpa
2019-02-23  8:39                                                         ` Peter Zijlstra
2019-02-25  8:47                                                           ` hpa
2019-02-25 13:21                                                             ` Peter Zijlstra
2019-03-01 15:07                                                               ` Peter Zijlstra
2019-02-25  8:49                                                           ` hpa
2019-02-22 23:55                                                       ` Andy Lutomirski
2019-02-23  8:37                                                         ` Peter Zijlstra
2019-02-23 10:52                                                           ` Peter Zijlstra
2019-02-25 10:51                                                         ` Peter Zijlstra
2019-02-25 11:53                                                           ` Peter Zijlstra
2019-02-25 15:36                                                             ` Andy Lutomirski
2019-02-23  0:34                                                       ` Andy Lutomirski
2019-02-23  1:12                                                         ` Linus Torvalds
2019-02-23  1:16                                                           ` Andy Lutomirski
2019-02-23  1:33                                                             ` Linus Torvalds
2019-02-23  1:40                                                             ` Linus Torvalds
2019-02-25  8:33                                                       ` Julien Thierry
2019-02-25 11:55                                                         ` Peter Zijlstra
2019-02-21 12:46                                             ` [PATCH] sched/x86: Save [ER]FLAGS on context switch Will Deacon
2019-02-21 22:06                                               ` Andy Lutomirski
2019-02-18  9:03                                 ` [PATCH v2] " Peter Zijlstra
2019-02-13 23:19                         ` [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region Linus Torvalds
2019-01-15 13:58 ` Julien Thierry [this message]
2019-01-25 14:27 ` [PATCH v3 0/4] uaccess: Add unsafe accessors for arm64 Catalin Marinas
2019-01-30 16:17 ` Julien Thierry

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