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compel: clear a breakpoint right after it's been triggered

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Breakpoints are used to stop as close as possible to a target system call.

First, we don't need it after this point.
Second, PTRACE_CONT can't pass through a breakpoint on arm64.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Andrei Vagin 2022-08-07 16:36:15 -07:00
parent d7477dac03
commit 719fea2fc9
2 changed files with 11 additions and 25 deletions
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15
compel/src/lib/infect.c
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@ -1418,9 +1418,6 @@ static int parasite_fini_seized(struct parasite_ctl *ctl)
if (compel_stop_on_syscall(1, __NR(rt_sigreturn, 0), __NR(rt_sigreturn, 1)))
return -1;
if (ptrace_flush_breakpoints(pid))
return -1;
/*
* All signals are unblocked now. The kernel notifies about leaving
* syscall before starting to deliver signals. All parasite code are
@ -1650,8 +1647,18 @@ int compel_stop_on_syscall(int tasks, const int sys_nr, const int sys_nr_compat)
pr_debug("%d was trapped\n", pid);
if ((WSTOPSIG(status) & PTRACE_SYSCALL_TRAP) == 0)
if ((WSTOPSIG(status) & PTRACE_SYSCALL_TRAP) == 0) {
/*
* On some platforms such as ARM64, it is impossible to
* pass through a breakpoint, so let's clear it right
* after it has been triggered.
*/
if (ptrace_flush_breakpoints(pid)) {
pr_err("Unable to clear breakpoints\n");
return -1;
}
goto goon;
}
if (trace == TRACE_EXIT) {
trace = TRACE_ENTER;
pr_debug("`- Expecting exit\n");