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util: allow to run criu under strace

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fork_and_ptrace_attach has to fork a child with CLONE_UNTRACED,
so that strace doesn't trace it.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Andrei Vagin
2023-09-28 21:26:41 +00:00
parent c9fdd355f6
commit 4c9d23d33d
1 changed files with 32 additions and 18 deletions
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50
criu/util.c
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@@ -661,40 +661,54 @@ out:
return ret; return ret;
} }
struct child_args {
int *sk_pair;
int (*child_setup)(void);
};
static int child_func(void *_args)
{
struct child_args *args = _args;
int sk, *sk_pair = args->sk_pair;
char c = 0;
sk = sk_pair[1];
close(sk_pair[0]);
if (args->child_setup && args->child_setup() != 0)
exit(1);
if (write(sk, &c, 1) != 1) {
pr_perror("write");
exit(1);
}
while (1)
sleep(1000);
exit(1);
}
pid_t fork_and_ptrace_attach(int (*child_setup)(void)) pid_t fork_and_ptrace_attach(int (*child_setup)(void))
{ {
pid_t pid; pid_t pid;
int sk_pair[2], sk; int sk_pair[2], sk;
char c = 0; char c = 0;
struct child_args cargs = {
.sk_pair = sk_pair,
.child_setup = child_setup,
};
if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) { if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) {
pr_perror("socketpair"); pr_perror("socketpair");
return -1; return -1;
} }
pid = fork(); pid = clone_noasan(child_func, CLONE_UNTRACED | SIGCHLD, &cargs);
if (pid < 0) { if (pid < 0) {
pr_perror("fork"); pr_perror("fork");
return -1; return -1;
} }
if (pid == 0) {
sk = sk_pair[1];
close(sk_pair[0]);
if (child_setup && child_setup() != 0)
exit(1);
if (write(sk, &c, 1) != 1) {
pr_perror("write");
exit(1);
}
while (1)
sleep(1000);
exit(1);
}
sk = sk_pair[0]; sk = sk_pair[0];
close(sk_pair[1]); close(sk_pair[1]);