* [PATCH RESEND] x86: Reject x32 executables if x32 ABI not supported
@ 2014-09-07 20:05 Ben Hutchings
2014-10-04 1:40 ` Ben Hutchings
2014-10-08 9:21 ` [tip:x86/urgent] " tip-bot for Ben Hutchings
0 siblings, 2 replies; 5+ messages in thread
From: Ben Hutchings @ 2014-09-07 20:05 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, H. Peter Anvin; +Cc: LKML
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It is currently possible to execve() an x32 executable on an x86_64
kernel that has only ia32 compat enabled. However all its syscalls
will fail, even _exit(). This usually causes it to segfault.
Change the ELF compat architecture check so that x32 executables are
rejected if we don't support the x32 ABI.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/x86/include/asm/elf.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 1a055c8..ca3347a 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -160,8 +160,9 @@ do { \
#define elf_check_arch(x) \
((x)->e_machine == EM_X86_64)
-#define compat_elf_check_arch(x) \
- (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
+#define compat_elf_check_arch(x) \
+ (elf_check_arch_ia32(x) || \
+ (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
#if __USER32_DS != __USER_DS
# error "The following code assumes __USER32_DS == __USER_DS"
--
Ben Hutchings
Experience is directly proportional to the value of equipment destroyed.
- Carolyn Scheppner
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^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH RESEND] x86: Reject x32 executables if x32 ABI not supported
2014-09-07 20:05 [PATCH RESEND] x86: Reject x32 executables if x32 ABI not supported Ben Hutchings
@ 2014-10-04 1:40 ` Ben Hutchings
2014-10-05 21:30 ` Thomas Gleixner
2014-10-08 9:21 ` [tip:x86/urgent] " tip-bot for Ben Hutchings
1 sibling, 1 reply; 5+ messages in thread
From: Ben Hutchings @ 2014-10-04 1:40 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, H. Peter Anvin; +Cc: LKML
[-- Attachment #1: Type: text/plain, Size: 1351 bytes --]
Can one of you please respond to this patch?
Ben.
On Sun, 2014-09-07 at 21:05 +0100, Ben Hutchings wrote:
> It is currently possible to execve() an x32 executable on an x86_64
> kernel that has only ia32 compat enabled. However all its syscalls
> will fail, even _exit(). This usually causes it to segfault.
>
> Change the ELF compat architecture check so that x32 executables are
> rejected if we don't support the x32 ABI.
>
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> ---
> arch/x86/include/asm/elf.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
> index 1a055c8..ca3347a 100644
> --- a/arch/x86/include/asm/elf.h
> +++ b/arch/x86/include/asm/elf.h
> @@ -160,8 +160,9 @@ do { \
> #define elf_check_arch(x) \
> ((x)->e_machine == EM_X86_64)
>
> -#define compat_elf_check_arch(x) \
> - (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
> +#define compat_elf_check_arch(x) \
> + (elf_check_arch_ia32(x) || \
> + (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
>
> #if __USER32_DS != __USER_DS
> # error "The following code assumes __USER32_DS == __USER_DS"
>
>
--
Ben Hutchings
One of the nice things about standards is that there are so many of them.
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^ permalink raw reply [flat|nested] 5+ messages in thread* [tip:x86/urgent] x86: Reject x32 executables if x32 ABI not supported
2014-09-07 20:05 [PATCH RESEND] x86: Reject x32 executables if x32 ABI not supported Ben Hutchings
2014-10-04 1:40 ` Ben Hutchings
@ 2014-10-08 9:21 ` tip-bot for Ben Hutchings
1 sibling, 0 replies; 5+ messages in thread
From: tip-bot for Ben Hutchings @ 2014-10-08 9:21 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, tglx, ben
Commit-ID: 0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1
Gitweb: http://git.kernel.org/tip/0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1
Author: Ben Hutchings <ben@decadent.org.uk>
AuthorDate: Sun, 7 Sep 2014 21:05:05 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 8 Oct 2014 11:17:42 +0200
x86: Reject x32 executables if x32 ABI not supported
It is currently possible to execve() an x32 executable on an x86_64
kernel that has only ia32 compat enabled. However all its syscalls
will fail, even _exit(). This usually causes it to segfault.
Change the ELF compat architecture check so that x32 executables are
rejected if we don't support the x32 ABI.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Link: http://lkml.kernel.org/r/1410120305.6822.9.camel@decadent.org.uk
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/elf.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 1a055c8..ca3347a 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -160,8 +160,9 @@ do { \
#define elf_check_arch(x) \
((x)->e_machine == EM_X86_64)
-#define compat_elf_check_arch(x) \
- (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
+#define compat_elf_check_arch(x) \
+ (elf_check_arch_ia32(x) || \
+ (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
#if __USER32_DS != __USER_DS
# error "The following code assumes __USER32_DS == __USER_DS"
^ permalink raw reply related [flat|nested] 5+ messages in thread
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2014-09-07 20:05 [PATCH RESEND] x86: Reject x32 executables if x32 ABI not supported Ben Hutchings
2014-10-04 1:40 ` Ben Hutchings
2014-10-05 21:30 ` Thomas Gleixner
2014-10-05 21:39 ` Ben Hutchings
2014-10-08 9:21 ` [tip:x86/urgent] " tip-bot for Ben Hutchings
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