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From: Kees Cook <keescook@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>, Rabin Vincent <rabin@rab.in>,
	Rob Herring <robh@kernel.org>,
	Laura Abbott <lauraa@codeaurora.org>,
	Leif Lindholm <leif.lindholm@linaro.org>,
	Stephen Boyd <sboyd@codeaurora.org>,
	Mark Salter <msalter@redhat.com>, Liu hua <sdu.liu@huawei.com>,
	Nikolay Borisov <Nikolay.Borisov@arm.com>,
	Nicolas Pitre <nicolas.pitre@linaro.org>,
	Tomasz Figa <t.figa@samsung.com>,
	Doug Anderson <dianders@google.com>,
	Jason Wessel <jason.wessel@windriver.com>,
	Will Deacon <will.deacon@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org
Subject: [PATCH v4 3/8] arm: fixmap: implement __set_fixmap()
Date: Wed, 13 Aug 2014 10:06:28 -0700	[thread overview]
Message-ID: <1407949593-16121-4-git-send-email-keescook@chromium.org> (raw)
In-Reply-To: <1407949593-16121-1-git-send-email-keescook@chromium.org>

This is used from set_fixmap() and clear_fixmap() via asm-generic/fixmap.h.
Also makes sure that the fixmap allocation fits into the expected range.

Based on patch by Rabin Vincent.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Rabin Vincent <rabin@rab.in>
---
 arch/arm/include/asm/fixmap.h |  2 ++
 arch/arm/mm/mmu.c             | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index d984ca69ce19..714606f70425 100644
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -14,6 +14,8 @@ enum fixed_addresses {
 	__end_of_fixed_addresses
 };
 
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
+
 #include <asm-generic/fixmap.h>
 
 #endif
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 7fa0966cd15f..94eecb913f15 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -22,6 +22,7 @@
 #include <asm/cputype.h>
 #include <asm/sections.h>
 #include <asm/cachetype.h>
+#include <asm/fixmap.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp_plat.h>
@@ -392,6 +393,24 @@ SET_MEMORY_FN(rw, pte_set_rw)
 SET_MEMORY_FN(x, pte_set_x)
 SET_MEMORY_FN(nx, pte_set_nx)
 
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
+{
+	unsigned long vaddr = __fix_to_virt(idx);
+	pte_t *pte = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+
+	/* Make sure fixmap region does not exceed available allocation. */
+	BUILD_BUG_ON(FIXADDR_START + (__end_of_fixed_addresses * PAGE_SIZE) >
+		     FIXADDR_END);
+	BUG_ON(idx >= __end_of_fixed_addresses);
+
+	if (pgprot_val(prot))
+		set_pte_at(NULL, vaddr, pte,
+			pfn_pte(phys >> PAGE_SHIFT, prot));
+	else
+		pte_clear(NULL, vaddr, pte);
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
+}
+
 /*
  * Adjust the PMD section entries according to the CPU in use.
  */
-- 
1.9.1


WARNING: multiple messages have this Message-ID (diff)
From: keescook@chromium.org (Kees Cook)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 3/8] arm: fixmap: implement __set_fixmap()
Date: Wed, 13 Aug 2014 10:06:28 -0700	[thread overview]
Message-ID: <1407949593-16121-4-git-send-email-keescook@chromium.org> (raw)
In-Reply-To: <1407949593-16121-1-git-send-email-keescook@chromium.org>

This is used from set_fixmap() and clear_fixmap() via asm-generic/fixmap.h.
Also makes sure that the fixmap allocation fits into the expected range.

Based on patch by Rabin Vincent.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Rabin Vincent <rabin@rab.in>
---
 arch/arm/include/asm/fixmap.h |  2 ++
 arch/arm/mm/mmu.c             | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index d984ca69ce19..714606f70425 100644
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -14,6 +14,8 @@ enum fixed_addresses {
 	__end_of_fixed_addresses
 };
 
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
+
 #include <asm-generic/fixmap.h>
 
 #endif
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 7fa0966cd15f..94eecb913f15 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -22,6 +22,7 @@
 #include <asm/cputype.h>
 #include <asm/sections.h>
 #include <asm/cachetype.h>
+#include <asm/fixmap.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp_plat.h>
@@ -392,6 +393,24 @@ SET_MEMORY_FN(rw, pte_set_rw)
 SET_MEMORY_FN(x, pte_set_x)
 SET_MEMORY_FN(nx, pte_set_nx)
 
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
+{
+	unsigned long vaddr = __fix_to_virt(idx);
+	pte_t *pte = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+
+	/* Make sure fixmap region does not exceed available allocation. */
+	BUILD_BUG_ON(FIXADDR_START + (__end_of_fixed_addresses * PAGE_SIZE) >
+		     FIXADDR_END);
+	BUG_ON(idx >= __end_of_fixed_addresses);
+
+	if (pgprot_val(prot))
+		set_pte_at(NULL, vaddr, pte,
+			pfn_pte(phys >> PAGE_SHIFT, prot));
+	else
+		pte_clear(NULL, vaddr, pte);
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
+}
+
 /*
  * Adjust the PMD section entries according to the CPU in use.
  */
-- 
1.9.1

  parent reply	other threads:[~2014-08-13 17:09 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-13 17:06 [PATCH v4 0/8] arm: support CONFIG_RODATA Kees Cook
2014-08-13 17:06 ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 1/8] arm: use generic fixmap.h Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 2/8] ARM: expand fixmap region to 3MB Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:26   ` Will Deacon
2014-08-19 12:26     ` Will Deacon
2014-08-20 12:16     ` Kees Cook
2014-08-20 12:16       ` Kees Cook
2014-08-26 14:37       ` Will Deacon
2014-08-26 14:37         ` Will Deacon
2014-08-13 17:06 ` Kees Cook [this message]
2014-08-13 17:06   ` [PATCH v4 3/8] arm: fixmap: implement __set_fixmap() Kees Cook
2014-08-13 17:06 ` [PATCH v4 4/8] arm: use fixmap for text patching when text is RO Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:29   ` Will Deacon
2014-08-19 12:29     ` Will Deacon
2014-08-20 12:28     ` Kees Cook
2014-08-20 12:28       ` Kees Cook
2014-09-03 21:43       ` Kees Cook
2014-09-03 21:43         ` Kees Cook
2014-09-04  9:27         ` Will Deacon
2014-09-04  9:27           ` Will Deacon
2014-09-04 14:00           ` Kees Cook
2014-09-04 14:00             ` Kees Cook
2014-09-04 14:06             ` Will Deacon
2014-09-04 14:06               ` Will Deacon
2014-08-13 17:06 ` [PATCH v4 5/8] ARM: kexec: Make .text R/W in machine_kexec Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 6/8] arm: kgdb: Handle read-only text / modules Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 7/8] ARM: mm: allow non-text sections to be non-executable Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:33   ` Will Deacon
2014-08-19 12:33     ` Will Deacon
2014-08-20 12:37     ` Kees Cook
2014-08-20 12:37       ` Kees Cook
2014-08-26 14:43       ` Will Deacon
2014-08-26 14:43         ` Will Deacon
2014-08-29 16:04         ` Kees Cook
2014-08-29 16:04           ` Kees Cook
2014-08-31 14:59           ` Rabin Vincent
2014-08-31 14:59             ` Rabin Vincent
2014-08-13 17:06 ` [PATCH v4 8/8] ARM: mm: allow text and rodata sections to be read-only Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:36   ` Will Deacon
2014-08-19 12:36     ` Will Deacon
2014-08-20 12:52     ` Kees Cook
2014-08-20 12:52       ` Kees Cook
2014-08-13 17:38 ` [PATCH v4 0/8] arm: support CONFIG_RODATA Nicolas Pitre
2014-08-13 17:38   ` Nicolas Pitre

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