54 lines
1.9 KiB
Diff
54 lines
1.9 KiB
Diff
From: Matt Fleming <matt@codeblueprint.co.uk>
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Date: Fri, 27 Nov 2015 21:09:30 +0000
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Subject: [1/5] x86/mm: Page align the '_end' symbol to avoid pfn conversion
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bugs
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Origin: https://git.kernel.org/cgit/linux/kernel/git/mfleming/efi.git/commit?id=21cdb6b568435738cc0b303b2b3b82742396310c
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Ingo noted that if we can guarantee _end is aligned to PAGE_SIZE
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we can automatically avoid bugs along the lines of,
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size = _end - _text >> PAGE_SHIFT
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which is missing a call to PFN_ALIGN(). The EFI mixed mode
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contains this bug, for example.
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_text is already aligned to PAGE_SIZE through the use of
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LOAD_PHYSICAL_ADDR, and the BSS and BRK sections are explicitly
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aligned in the linker script, so it makes sense to align _end to
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match.
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Reported-by: Ingo Molnar <mingo@kernel.org>
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Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
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Acked-by: Borislav Petkov <bp@suse.de>
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Cc: Andy Lutomirski <luto@amacapital.net>
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Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@intel.com>
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Cc: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: Toshi Kani <toshi.kani@hp.com>
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Cc: linux-efi@vger.kernel.org
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Link: http://lkml.kernel.org/r/1448658575-17029-2-git-send-email-matt@codeblueprint.co.uk
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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---
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arch/x86/kernel/vmlinux.lds.S | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
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index 74e4bf11f562..4f1994257a18 100644
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--- a/arch/x86/kernel/vmlinux.lds.S
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+++ b/arch/x86/kernel/vmlinux.lds.S
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@@ -325,6 +325,7 @@ SECTIONS
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__brk_limit = .;
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}
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+ . = ALIGN(PAGE_SIZE);
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_end = .;
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STABS_DEBUG
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