[arm64] mm: Limit TASK_SIZE_64 for compatibility
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@ -9,6 +9,7 @@ linux (4.8~rc5-1~exp2) UNRELEASED; urgency=medium
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- Set -fdebug-prefix-map=... in compiler options for kernel and userland
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- linux-headers: Stop including unused arch/*/kernel/asm-offsets.s files
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* linux-doc: Exclude Sphinx support code and Makefiles
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* [arm64] mm: Limit TASK_SIZE_64 for compatibility
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-- Ben Hutchings <ben@decadent.org.uk> Fri, 16 Sep 2016 16:39:53 +0100
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27
debian/patches/bugfix/arm64/arm64-mm-limit-task_size_64-for-compatibility.patch
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27
debian/patches/bugfix/arm64/arm64-mm-limit-task_size_64-for-compatibility.patch
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@ -0,0 +1,27 @@
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From: Ben Hutchings <ben@decadent.org.uk>
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Date: Fri, 16 Sep 2016 16:32:23 +0100
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Subject: arm64/mm: Limit TASK_SIZE_64 for compatibility
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Some programs assume they can use 17 tag bits in a 64-bit pointer,
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which works on most other 64-bit architectures but not on arm64 with
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CONFIG_ARM64_VA_BITS_48. To maintain compatibility with these
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programs, limit TASK_SIZE_64 to a maximum of 1 << 47.
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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--- a/arch/arm64/include/asm/memory.h
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+++ b/arch/arm64/include/asm/memory.h
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@@ -74,7 +74,12 @@
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#define PCI_IO_END (VMEMMAP_START - SZ_2M)
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#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
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#define FIXADDR_TOP (PCI_IO_START - SZ_2M)
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+#if VA_BITS <= 47
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#define TASK_SIZE_64 (UL(1) << VA_BITS)
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+#else
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+/* User-space might use up to 17 tag bits in 64-bit pointers */
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+#define TASK_SIZE_64 (UL(1) << 47)
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+#endif
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#ifdef CONFIG_COMPAT
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#define TASK_SIZE_32 UL(0x100000000)
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@ -45,6 +45,7 @@ bugfix/x86/viafb-autoload-on-olpc-xo1.5-only.patch
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debian/fanotify-taint-on-use-of-fanotify_access_permissions.patch
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# Arch bug fixes
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bugfix/arm64/arm64-mm-limit-task_size_64-for-compatibility.patch
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# Arch features
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features/mips/MIPS-increase-MAX-PHYSMEM-BITS-on-Loongson-3-only.patch
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