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linux-user: support target-to-host SCM_CREDENTIALS 

When passing ancillary data through a unix socket, handle
credentials properly instead of doing a simple copy and
issuing a warning.

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Alex Suykov 2014-12-23 07:52:58 +02:00 committed by Riku Voipio
parent 1669add752
commit 30b8b68eb5
1 changed files with 14 additions and 4 deletions
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18
linux-user/syscall.c
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@ -1214,16 +1214,26 @@ static inline abi_long target_to_host_cmsg(struct msghdr *msgh,
cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type);
cmsg->cmsg_len = CMSG_LEN(len);
if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
memcpy(data, target_data, len);
} else {
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
int *fd = (int *)data;
int *target_fd = (int *)target_data;
int i, numfds = len / sizeof(int);
for (i = 0; i < numfds; i++)
fd[i] = tswap32(target_fd[i]);
} else if (cmsg->cmsg_level == SOL_SOCKET
&& cmsg->cmsg_type == SCM_CREDENTIALS) {
struct ucred *cred = (struct ucred *)data;
struct target_ucred *target_cred =
(struct target_ucred *)target_data;
__put_user(target_cred->pid, &cred->pid);
__put_user(target_cred->uid, &cred->uid);
__put_user(target_cred->gid, &cred->gid);
} else {
gemu_log("Unsupported ancillary data: %d/%d\n",
cmsg->cmsg_level, cmsg->cmsg_type);
memcpy(data, target_data, len);
}
cmsg = CMSG_NXTHDR(msgh, cmsg);