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Date: Sun, 29 Nov 2015 01:03:44 -0800 From: tip-bot for Matt Fleming <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: dave.hansen@...el.com, toshi.kani@...com, bp@...e.de, ard.biesheuvel@...aro.org, luto@...capital.net, dvlasenk@...hat.com, matt@...eblueprint.co.uk, hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org, sai.praneeth.prakhya@...el.com, mingo@...nel.org, brgerst@...il.com, torvalds@...ux-foundation.org, peterz@...radead.org, bp@...en8.de Subject: [tip:x86/efi] x86/mm: Page align the '_end' symbol to avoid pfn conversion bugs Commit-ID: 21cdb6b568435738cc0b303b2b3b82742396310c Gitweb: http://git.kernel.org/tip/21cdb6b568435738cc0b303b2b3b82742396310c Author: Matt Fleming <matt@...eblueprint.co.uk> AuthorDate: Fri, 27 Nov 2015 21:09:30 +0000 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Sun, 29 Nov 2015 09:15:42 +0100 x86/mm: Page align the '_end' symbol to avoid pfn conversion bugs Ingo noted that if we can guarantee _end is aligned to PAGE_SIZE we can automatically avoid bugs along the lines of, size = _end - _text >> PAGE_SHIFT which is missing a call to PFN_ALIGN(). The EFI mixed mode contains this bug, for example. _text is already aligned to PAGE_SIZE through the use of LOAD_PHYSICAL_ADDR, and the BSS and BRK sections are explicitly aligned in the linker script, so it makes sense to align _end to match. Reported-by: Ingo Molnar <mingo@...nel.org> Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk> Acked-by: Borislav Petkov <bp@...e.de> Cc: Andy Lutomirski <luto@...capital.net> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org> Cc: Borislav Petkov <bp@...en8.de> Cc: Brian Gerst <brgerst@...il.com> Cc: Dave Hansen <dave.hansen@...el.com> Cc: Denys Vlasenko <dvlasenk@...hat.com> Cc: H. Peter Anvin <hpa@...or.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Toshi Kani <toshi.kani@...com> Cc: linux-efi@...r.kernel.org Link: http://lkml.kernel.org/r/1448658575-17029-2-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@...nel.org> --- arch/x86/kernel/vmlinux.lds.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 74e4bf1..4f19942 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -325,6 +325,7 @@ SECTIONS __brk_limit = .; } + . = ALIGN(PAGE_SIZE); _end = .; STABS_DEBUG -- 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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