Commit-ID: 21cdb6b568435738cc0b303b2b3b82742396310c Gitweb: http://git.kernel.org/tip/21cdb6b568435738cc0b303b2b3b82742396310c Author: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> AuthorDate: Fri, 27 Nov 2015 21:09:30 +0000 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> Acked-by: Borislav Petkov <bp@xxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Toshi Kani <toshi.kani@xxxxxx> Cc: linux-efi@xxxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/1448658575-17029-2-git-send-email-matt@xxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html