From aa03c428e67881795f4190f9ffdb62fc14978608 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Thu, 22 Jan 2015 18:20:35 +0000 Subject: [PATCH] arm64: Fix overlapping VA allocations PCI IO space was intended to be 16MiB, at 32MiB below MODULES_VADDR, but commit d1e6dc91b532d3d3 ("arm64: Add architectural support for PCI") extended this to cover the full 32MiB. The final 8KiB of this 32MiB is also allocated for the fixmap, allowing for potential clashes between the two. This change was masked by assumptions in mem_init and the page table dumping code, which assumed the I/O space to be 16MiB long through seaparte hard-coded definitions. This patch changes the definition of the PCI I/O space allocation to live in asm/memory.h, along with the other VA space allocations. As the fixmap allocation depends on the number of fixmap entries, this is moved below the PCI I/O space allocation. Both the fixmap and PCI I/O space are guarded with 2MB of padding. Sites assuming the I/O space was 16MiB are moved over use new PCI_IO_{START,END} definitions, which will keep in sync with the size of the IO space (now restored to 16MiB). As a useful side effect, the use of the new PCI_IO_{START,END} definitions prevents a build issue in the dumping code due to a (now redundant) missing include of io.h for PCI_IOBASE. Signed-off-by: Mark Rutland Cc: Kees Cook Cc: Laura Abbott Cc: Liviu Dudau Cc: Steve Capper Cc: Will Deacon [catalin.marinas@arm.com: reorder FIXADDR and PCI_IO address_markers_idx enum] Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/io.h | 5 +++-- arch/arm64/include/asm/memory.h | 10 +++++++++- arch/arm64/mm/dump.c | 8 ++++---- arch/arm64/mm/init.c | 5 +++-- 4 files changed, 19 insertions(+), 9 deletions(-) diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 949c406d4df4..540f7c0aea82 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -26,6 +26,7 @@ #include #include +#include #include #include #include @@ -145,8 +146,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) * I/O port access primitives. */ #define arch_has_dev_port() (1) -#define IO_SPACE_LIMIT (SZ_32M - 1) -#define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M)) +#define IO_SPACE_LIMIT (PCI_IO_SIZE - 1) +#define PCI_IOBASE ((void __iomem *)PCI_IO_START) /* * String version of I/O memory access operations. diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 6486b2bfd562..f800d45ea226 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -33,6 +33,12 @@ #define UL(x) _AC(x, UL) /* + * Size of the PCI I/O space. This must remain a power of two so that + * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. + */ +#define PCI_IO_SIZE SZ_16M + +/* * PAGE_OFFSET - the virtual address of the start of the kernel image (top * (VA_BITS - 1)) * VA_BITS - the maximum number of bits for virtual addresses. @@ -45,7 +51,9 @@ #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) #define MODULES_END (PAGE_OFFSET) #define MODULES_VADDR (MODULES_END - SZ_64M) -#define FIXADDR_TOP (MODULES_VADDR - SZ_2M - PAGE_SIZE) +#define PCI_IO_END (MODULES_VADDR - SZ_2M) +#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) +#define FIXADDR_TOP (PCI_IO_START - SZ_2M) #define TASK_SIZE_64 (UL(1) << VA_BITS) #ifdef CONFIG_COMPAT diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c index cf33f33333cc..77d39a1b6f8d 100644 --- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -36,10 +36,10 @@ enum address_markers_idx { VMEMMAP_START_NR, VMEMMAP_END_NR, #endif - PCI_START_NR, - PCI_END_NR, FIXADDR_START_NR, FIXADDR_END_NR, + PCI_START_NR, + PCI_END_NR, MODULES_START_NR, MODUELS_END_NR, KERNEL_SPACE_NR, @@ -52,10 +52,10 @@ static struct addr_marker address_markers[] = { { 0, "vmemmap start" }, { 0, "vmemmap end" }, #endif - { (unsigned long) PCI_IOBASE, "PCI I/O start" }, - { (unsigned long) PCI_IOBASE + SZ_16M, "PCI I/O end" }, { FIXADDR_START, "Fixmap start" }, { FIXADDR_TOP, "Fixmap end" }, + { PCI_IO_START, "PCI I/O start" }, + { PCI_IO_END, "PCI I/O end" }, { MODULES_VADDR, "Modules start" }, { MODULES_END, "Modules end" }, { PAGE_OFFSET, "Kernel Mapping" }, diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 43cccb5101c0..a8dfb40eefa8 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -35,6 +35,7 @@ #include #include +#include #include #include #include @@ -296,8 +297,8 @@ void __init mem_init(void) " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n" " 0x%16lx - 0x%16lx (%6ld MB actual)\n" #endif - " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n" + " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" " .init : 0x%p" " - 0x%p" " (%6ld KB)\n" @@ -310,8 +311,8 @@ void __init mem_init(void) MLM((unsigned long)virt_to_page(PAGE_OFFSET), (unsigned long)virt_to_page(high_memory)), #endif - MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M), MLK(FIXADDR_START, FIXADDR_TOP), + MLM(PCI_IO_START, PCI_IO_END), MLM(MODULES_VADDR, MODULES_END), MLM(PAGE_OFFSET, (unsigned long)high_memory), MLK_ROUNDUP(__init_begin, __init_end), -- 2.11.0