| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sat, 17 Nov 2012 23:09:22 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org> Subject: [PATCH v2 04/13] x86, 64bit: set extra ident page table for whole kernel range Current when kernel is loaded above 1G, only [_text, _text+2M] is set up with extra ident page table. That is not enough, some variables that could be used early are out of that range. (like gdt...) Just set map for [_text, _end] include text/data/bss/brk... Signed-off-by: Yinghai Lu <yinghai@...nel.org> Cc: "Eric W. Biederman" <ebiederm@...ssion.com> --- arch/x86/kernel/head_64.S | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 94bf9cc..efc0c08 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -115,7 +115,16 @@ startup_64: andq $(PTRS_PER_PMD - 1), %rax leaq __PAGE_KERNEL_IDENT_LARGE_EXEC(%rdi), %rdx leaq level2_spare_pgt(%rip), %rbx - movq %rdx, 0(%rbx, %rax, 8) + leaq _end(%rip), %r8 + decq %r8 + shrq $PMD_SHIFT, %r8 + andq $(PTRS_PER_PMD - 1), %r8 +1: movq %rdx, 0(%rbx, %rax, 8) + addq $PMD_SIZE, %rdx + incq %rax + cmp %r8, %rax + jle 1b + ident_complete: /* -- 1.7.7 -- 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/
Powered by blists - more mailing lists