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util: zero msghdr structures

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musl-libc fixed inconsistency between posix and kernl msghdr structures
by adding pad-s.

It initializes all pad-s before calling recvmsg and sendmsg syscalls.
CRIU calls raw system calls from pie code, so we need to intialize pads too.

In addition, we don't initialize msg_flags and iov_len.

https://github.com/xemul/criu/issues/276

https://travis-ci.org/kolyshkin/criu/builds/198415449
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Andrei Vagin 2017-02-04 14:35:49 -08:00 • committed by Pavel Emelyanov
parent 0367a1f6fe
commit a6ae38f71b
1 changed files with 4 additions and 2 deletions
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6
include/common/scm-code.c
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@ -50,7 +50,8 @@ static int *scm_fdset_init(struct scm_fdset *fdset, struct sockaddr_un *saddr,
int send_fds(int sock, struct sockaddr_un *saddr, int len,
int *fds, int nr_fds, void *data, unsigned ch_size)
{
struct scm_fdset fdset;
/* In musl_libc the msghdr structure has pads which has to be zeroed */
struct scm_fdset fdset = {};
int *cmsg_data;
int i, min_fd, ret;
@ -73,7 +74,8 @@ int send_fds(int sock, struct sockaddr_un *saddr, int len,
int __recv_fds(int sock, int *fds, int nr_fds, void *data, unsigned ch_size, int flags)
{
struct scm_fdset fdset;
/* In musl_libc the msghdr structure has pads which has to be zeroed */
struct scm_fdset fdset = {};
struct cmsghdr *cmsg;
int *cmsg_data;
int ret;