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c2c9b52fab
We weren't restoring FLAGS at all on SYSEXIT. Apparently no one cared. With this patch applied, native kernels should always honor task_pt_regs()->flags, which opens the door for some sys_iopl() cleanups. I'll do those as a separate series, though, since getting it right will involve tweaking some paravirt ops. ( The short version is that, before this patch, sys_iopl(), invoked via SYSENTER, wasn't guaranteed to ever transfer the updated regs->flags, so sys_iopl() had to change the hardware flags register as well. ) Reported-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> 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: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/3f98b207472dc9784838eb5ca2b89dcc845ce269.1457578375.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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