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arm64: ptrace: Use NO_SYSCALL instead of -1 in syscall_trace_enter()

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Setting a system call number of -1 is special, as it indicates that the
current system call should be skipped.

Use NO_SYSCALL instead of -1 when checking for this scenario, which is
different from the -1 returned due to a seccomp failure.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Keno Fischer <keno@juliacomputing.com>
Cc: Luis Machado <luis.machado@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon
2020-07-10 13:20:57 +01:00
parent 139dbe5d8e
commit d83ee6e3e7
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/ptrace.c
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@@ -1856,12 +1856,12 @@ int syscall_trace_enter(struct pt_regs *regs)
if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (!in_syscall(regs) || (flags & _TIF_SYSCALL_EMU))
return -1;
return NO_SYSCALL;
}
/* Do the secure computing after ptrace; failures should be fast. */
if (secure_computing() == -1)
return -1;
return NO_SYSCALL;
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, regs->syscallno);