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journal,network,timesync: fix segfault on 32bit timeval/timespec systems

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Fixes #20741.
This commit is contained in:
Yu Watanabe 2021-09-15 23:29:11 +09:00 committed by Lennart Poettering
parent 5aaa55d841
commit f782eee68a
3 changed files with 9 additions and 4 deletions
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7
src/journal/journald-server.c
View file

@ -1267,11 +1267,14 @@ int server_process_datagram(
/* We use NAME_MAX space for the SELinux label here. The kernel currently enforces no limit, but
* according to suggestions from the SELinux people this will change and it will probably be
* identical to NAME_MAX. For now we use that, but this should be updated one day when the final
* limit is known. */
* limit is known.
*
* Here, we need to explicitly initialize the buffer with zero, as glibc has a bug in
* __convert_scm_timestamps(), which assumes the buffer is initialized. See #20741. */
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
CMSG_SPACE_TIMEVAL +
CMSG_SPACE(sizeof(int)) + /* fd */
CMSG_SPACE(NAME_MAX) /* selinux label */) control;
CMSG_SPACE(NAME_MAX) /* selinux label */) control = {};
union sockaddr_union sa = {};

3
src/libsystemd-network/icmp6-util.c
View file

@ -148,8 +148,9 @@ int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
int icmp6_receive(int fd, void *buffer, size_t size, struct in6_addr *ret_dst,
triple_timestamp *ret_timestamp) {
/* This needs to be initialized with zero. See #20741. */
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int)) + /* ttl */
CMSG_SPACE_TIMEVAL) control;
CMSG_SPACE_TIMEVAL) control = {};
struct iovec iov = {};
union sockaddr_union sa = {};
struct msghdr msg = {

3
src/timesync/timesyncd-manager.c
View file

@ -416,7 +416,8 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
.iov_base = &ntpmsg,
.iov_len = sizeof(ntpmsg),
};
CMSG_BUFFER_TYPE(CMSG_SPACE_TIMESPEC) control;
/* This needs to be initialized with zero. See #20741. */
CMSG_BUFFER_TYPE(CMSG_SPACE_TIMESPEC) control = {};
union sockaddr_union server_addr;
struct msghdr msghdr = {
.msg_iov = &iov,