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ptrace: fix execve and return value handling (fixes strace on aarch64)

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Change-Id: Icb5cb7f7e99fdb74a8628bc6b550688df5fb056b
This commit is contained in:
Balazs Gerofi
2020-02-10 03:44:43 +00:00
parent 597baf8445
commit 4bbdee395e
3 changed files with 26 additions and 11 deletions
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8
arch/arm64/kernel/ptrace.c
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@ -964,6 +964,7 @@ void ptrace_report_signal(struct thread *thread, int sig)
/* save thread_info, if called by ptrace_report_exec() */
if (sig == ((SIGTRAP | (PTRACE_EVENT_EXEC << 8)))) {
memcpy(&tinfo, thread->ctx.thread, sizeof(struct thread_info));
thread->uctx->user_regs.regs[0] = 0;
}
mcs_rwlock_writer_lock(&proc->update_lock, &lock);
@ -976,6 +977,13 @@ void ptrace_report_signal(struct thread *thread, int sig)
thread->exit_status = sig;
thread->status = PS_TRACED;
thread->ptrace &= ~PT_TRACE_SYSCALL;
if (sig == ((SIGTRAP | (PTRACE_EVENT_EXEC << 8))) &&
thread->ptrace & PTRACE_O_TRACEEXEC) {
/* PTRACE_O_TRACEEXEC: since Linux 3.0, the former
* thread ID can be retrieved with PTRACE_GETEVENTMSG.
* Report no change. */
thread->ptrace_eventmsg = thread->tid;
}
save_debugreg(thread->ptrace_debugreg);
if (sig == SIGSTOP || sig == SIGTSTP ||
sig == SIGTTIN || sig == SIGTTOU) {