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cr-check: add ability to check if pidfd_store feature is supported

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pidfd_store which will be used for reliable pidfd based pid reuse
detection for RPC clients requires two recent syscalls (pidfd_open
and pidfd_getfd).

We allow checking if pidfd_store is supported using:
	1. CLI: criu check --feature pidfd_store
	2. RPC: CRIU_REQ_TYPE__FEATURE_CHECK and set pidfd_store to
	   true in the "features" field of the request

Signed-off-by: Zeyad Yasser <zeyady98@gmail.com>
This commit is contained in:
Zeyad Yasser 2021-03-16 15:07:39 +02:00 committed by Andrei Vagin
parent e3c9c3429a
commit ba882893c3
3 changed files with 24 additions and 0 deletions
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17
criu/cr-check.c
View File

@ -1331,6 +1331,21 @@ static int check_net_diag_raw(void)
socket_test_collect_bit(AF_INET6, IPPROTO_RAW)) ? 0 : -1;
}
static int check_pidfd_store(void)
{
if (!kdat.has_pidfd_open) {
pr_warn("Pidfd store requires pidfd_open syscall which is not supported\n");
return -1;
}
if (!kdat.has_pidfd_getfd) {
pr_warn("Pidfd store requires pidfd_getfd syscall which is not supported\n");
return -1;
}
return 0;
}
static int (*chk_feature)(void);
/*
@ -1443,6 +1458,7 @@ int cr_check(void)
ret |= check_clone3_set_tid();
ret |= check_time_namespace();
ret |= check_newifindex();
ret |= check_pidfd_store();
}
/*
@ -1551,6 +1567,7 @@ static struct feature_list feature_list[] = {
{ "newifindex", check_newifindex},
{ "nftables", check_nftables_cr },
{ "has_ipt_legacy", check_ipt_legacy },
{ "pidfd_store", check_pidfd_store },
{ NULL, NULL },
};

6
criu/cr-service.c
View File

@ -1065,6 +1065,8 @@ static int handle_feature_check(int sk, CriuReq * msg)
feat.mem_track = false;
feat.has_lazy_pages = 1;
feat.lazy_pages = false;
feat.has_pidfd_store = 1;
feat.pidfd_store = false;
pid = fork();
if (pid < 0) {
@ -1086,6 +1088,10 @@ static int handle_feature_check(int sk, CriuReq * msg)
(msg->features->lazy_pages == true))
feat.lazy_pages = kdat.has_uffd && uffd_noncooperative();
if ((msg->features->has_pidfd_store == 1) &&
(msg->features->pidfd_store == true))
feat.pidfd_store = kdat.has_pidfd_getfd && kdat.has_pidfd_open;
resp.features = &feat;
resp.type = msg->type;
/* The feature check is working, actual results are in resp.features */

1
images/rpc.proto
View File

@ -174,6 +174,7 @@ enum criu_req_type {
message criu_features {
optional bool mem_track = 1;
optional bool lazy_pages = 2;
optional bool pidfd_store = 3;
}
/*