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Date: Wed, 13 Aug 2014 10:06:28 -0700 From: Kees Cook <keescook@...omium.org> To: linux-kernel@...r.kernel.org Cc: Kees Cook <keescook@...omium.org>, Rabin Vincent <rabin@....in>, Rob Herring <robh@...nel.org>, Laura Abbott <lauraa@...eaurora.org>, Leif Lindholm <leif.lindholm@...aro.org>, Stephen Boyd <sboyd@...eaurora.org>, Mark Salter <msalter@...hat.com>, Liu hua <sdu.liu@...wei.com>, Nikolay Borisov <Nikolay.Borisov@....com>, Nicolas Pitre <nicolas.pitre@...aro.org>, Tomasz Figa <t.figa@...sung.com>, Doug Anderson <dianders@...gle.com>, Jason Wessel <jason.wessel@...driver.com>, Will Deacon <will.deacon@....com>, Catalin Marinas <catalin.marinas@....com>, Russell King - ARM Linux <linux@....linux.org.uk>, linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org Subject: [PATCH v4 3/8] arm: fixmap: implement __set_fixmap() 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@...omium.org> Cc: Rabin Vincent <rabin@....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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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