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ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped() 

Turn send_sig_info(SIGSTOP) into send_signal_locked(SIGSTOP) and move it
from ptrace_attach() to ptrace_set_stopped().

This looks more logical and avoids lock(siglock) right after unlock().

Link: https://lkml.kernel.org/r/20240122171631.GA29844@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2024-01-22 18:16:31 +01:00 committed by Andrew Morton
parent d6bbab8f35
commit 08701813a1
1 changed files with 5 additions and 8 deletions
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13
kernel/ptrace.c
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@ -375,10 +375,13 @@ static int check_ptrace_options(unsigned long data)
return 0;
}
static inline void ptrace_set_stopped(struct task_struct *task)
static inline void ptrace_set_stopped(struct task_struct *task, bool seize)
{
guard(spinlock)(&task->sighand->siglock);
/* SEIZE doesn't trap tracee on attach */
if (!seize)
send_signal_locked(SIGSTOP, SEND_SIG_PRIV, task, PIDTYPE_PID);
/*
* If the task is already STOPPED, set JOBCTL_TRAP_STOP and
* TRAPPING, and kick it so that it transits to TRACED. TRAPPING
@ -457,14 +460,8 @@ static int ptrace_attach(struct task_struct *task, long request,
return -EPERM;
task->ptrace = flags;
ptrace_link(task, current);
/* SEIZE doesn't trap tracee on attach */
if (!seize)
send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
ptrace_set_stopped(task);
ptrace_set_stopped(task, seize);
}
}