Messages in this thread Patch in this message | | | Date | Wed, 8 Jul 2015 12:12:40 -0700 | From | tip-bot for Andy Lutomirski <> | Subject | [tip:x86/asm] x86/entry/64: Fix IRQ state confusion and related warning on compat syscalls with CONFIG_AUDITSYSCALL =n |
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Commit-ID: 8f7f06b87acd2e017d6c536f59e10045dd8d0578 Gitweb: http://git.kernel.org/tip/8f7f06b87acd2e017d6c536f59e10045dd8d0578 Author: Andy Lutomirski <luto@kernel.org> AuthorDate: Tue, 7 Jul 2015 10:55:28 -0700 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 8 Jul 2015 21:10:25 +0200
x86/entry/64: Fix IRQ state confusion and related warning on compat syscalls with CONFIG_AUDITSYSCALL=n
int_ret_from_sys_call now expects IRQs to be enabled. I got this right in the real sysexit_audit and sysretl_audit asm paths, but I missed it in the #defined-away versions when CONFIG_AUDITSYSCALL=n. This is a straightforward fix for CONFIG_AUDITSYSCALL=n
Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 29ea1b258b98 ("x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and remove old assembly code") Link: http://lkml.kernel.org/r/25cf0a01e01c6008118dd8f8d9f043020416700c.1436291493.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/entry/entry_64_compat.S | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 25aca51..d757153 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -22,8 +22,8 @@ #define __AUDIT_ARCH_LE 0x40000000 #ifndef CONFIG_AUDITSYSCALL -# define sysexit_audit ia32_ret_from_sys_call -# define sysretl_audit ia32_ret_from_sys_call +# define sysexit_audit ia32_ret_from_sys_call_irqs_off +# define sysretl_audit ia32_ret_from_sys_call_irqs_off #endif .section .entry.text, "ax" @@ -466,6 +466,10 @@ ia32_badarg: /* And exit again. */ jmp retint_user +ia32_ret_from_sys_call_irqs_off: + TRACE_IRQS_ON + ENABLE_INTERRUPTS(CLBR_NONE) + ia32_ret_from_sys_call: xorl %eax, %eax /* Do not leak kernel information */ movq %rax, R11(%rsp)
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