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| author | Sudeep Holla <sudeep.holla@arm.com> | 2019-06-11 15:56:27 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2019-06-27 10:14:06 +0100 |
| commit | b07d7d5c7b421462dc91f0b775e31aae49804050 (patch) | |
| tree | 48cc1fa49ae1a48b0ec66e1c236878ff74726bdb /arch/x86/entry/common.c | |
| parent | 7b71665603bba0fa53e2cd63de9125a0bc3f6e17 (diff) | |
| download | linux-b07d7d5c7b421462dc91f0b775e31aae49804050.tar.bz2 | |
x86/entry: Simplify _TIF_SYSCALL_EMU handling
The usage of emulated and _TIF_SYSCALL_EMU flags in syscall_trace_enter
is more complicated than required.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/x86/entry/common.c')
| -rw-r--r-- | arch/x86/entry/common.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index a986b3c8294c..0a61705d62ec 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -72,23 +72,18 @@ static long syscall_trace_enter(struct pt_regs *regs) struct thread_info *ti = current_thread_info(); unsigned long ret = 0; - bool emulated = false; u32 work; if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) BUG_ON(regs != task_pt_regs(current)); - work = READ_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY; + work = READ_ONCE(ti->flags); - if (unlikely(work & _TIF_SYSCALL_EMU)) - emulated = true; - - if ((emulated || (work & _TIF_SYSCALL_TRACE)) && - tracehook_report_syscall_entry(regs)) - return -1L; - - if (emulated) - return -1L; + if (work & (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU)) { + ret = tracehook_report_syscall_entry(regs); + if (ret || (work & _TIF_SYSCALL_EMU)) + return -1L; + } #ifdef CONFIG_SECCOMP /* |