| 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
| ||
|
Message-Id: <1360447729-4256-1-git-send-email-bp@alien8.de> Date: Sat, 9 Feb 2013 23:08:49 +0100 From: Borislav Petkov <bp@...en8.de> To: "H. Peter Anvin" <hpa@...or.com> Cc: X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de> Subject: [PATCH 5/5 -v2] x86, head_32: Clear DF much earlier From: Borislav Petkov <bp@...e.de> All GCC versions expect the direction flag to be cleared (DF=0) so move this to the default entry point for each core. Signed-off-by: Borislav Petkov <bp@...e.de> --- arch/x86/kernel/head_32.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 75e96d7e4e5f..8b2a8a824fc6 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -322,10 +322,11 @@ default_entry: * debugger if this code is traced. Best to initialize before switching to * protected mode. */ - pushl $0 popfl + cld # GCC wants DF=0 at all times + /* * New page tables may be in 4Mbyte page mode and may be using the global pages. * @@ -463,7 +464,6 @@ is486: xorl %eax,%eax # Clear LDT lldt %ax - cld # gcc2 wants the direction flag cleared at all times pushl $0 # fake return address for unwinder jmp *(initial_code) -- 1.8.1.3.535.ga923c31 -- 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