diff options
author | Andy Lutomirski <luto@kernel.org> | 2015-10-16 15:42:54 -0700 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2015-10-18 12:11:16 +0200 |
commit | 657c1eea0019e80685a84cbb1919794243a187c9 (patch) | |
tree | 67eeeb89260f28257628ecbd7f8531ce63925d5b /arch/x86/entry/entry_32.S | |
parent | 612bece654ff6cd43160e201985be826e96b8bcb (diff) |
x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on
When I rewrote entry_INT80_32, I thought that int80 was an
interrupt gate. It's a trap gate. *facepalm*
Thanks to Brian Gerst for pointing out that it's better to
change the entry code than to change the gate type.
Suggested-by: Brian Gerst <brgerst@gmail.com>
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
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: 150ac78d63af ("x86/entry/32: Switch INT80 to the new C syscall path")
Link: http://lkml.kernel.org/r/dc09d9b574a5c1dcca996847875c73f8341ce0ad.1445035014.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/entry/entry_32.S')
-rw-r--r-- | arch/x86/entry/entry_32.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index c1c7c6364216..4f97f49261d3 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -345,13 +345,13 @@ ENTRY(entry_INT80_32) SAVE_ALL pt_regs_ax=$-ENOSYS /* save rest */ /* - * User mode is traced as though IRQs are on, and the interrupt gate - * turned them off. + * User mode is traced as though IRQs are on. Unlike the 64-bit + * case, INT80 is a trap gate on 32-bit kernels, so interrupts + * are already on (unless user code is messing around with iopl). */ - TRACE_IRQS_OFF movl %esp, %eax - call do_int80_syscall_32 + call do_syscall_32_irqs_on .Lsyscall_32_done: restore_all: |