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arm64: ptrace: add support for syscall emulation

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Add PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP support on arm64.
We don't need any special handling for PTRACE_SYSEMU_SINGLESTEP.

It's quite difficult to generalize handling PTRACE_SYSEMU cross
architectures and avoid calls to tracehook_report_syscall_entry twice.
Different architecture have different mechanism to indicate NO_SYSCALL
and trying to generalise adds more code for no gain.

Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sudeep Holla
2019-05-23 10:06:18 +01:00
committed by Catalin Marinas
parent fd3866381b
commit f086f67485
2 changed files with 9 additions and 2 deletions
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6
arch/arm64/kernel/ptrace.c
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@@ -1819,8 +1819,12 @@ static void tracehook_report_syscall(struct pt_regs *regs,
int syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
if (test_thread_flag(TIF_SYSCALL_TRACE) ||
test_thread_flag(TIF_SYSCALL_EMU)) {
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (!in_syscall(regs) || test_thread_flag(TIF_SYSCALL_EMU))
return -1;
}
/* Do the secure computing after ptrace; failures should be fast. */
if (secure_computing(NULL) == -1)