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linux-user: Use safe_syscall wrapper for msgsnd and msgrcv

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Use the safe_syscall wrapper for msgsnd and msgrcv syscalls.
This is made slightly awkward by some host architectures providing
only a single 'ipc' syscall rather than separate syscalls per
operation; we provide safe_msgsnd() and safe_msgrcv() as wrappers
around safe_ipc() to handle this if needed.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-06-06 19:58:05 +01:00 committed by Riku Voipio
parent 666875306e
commit 89f9fe4452
1 changed files with 30 additions and 2 deletions
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32
linux-user/syscall.c
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@ -722,6 +722,34 @@ safe_syscall6(ssize_t, recvfrom, int, fd, void *, buf, size_t, len,
int, flags, struct sockaddr *, addr, socklen_t *, addrlen)
safe_syscall3(ssize_t, sendmsg, int, fd, const struct msghdr *, msg, int, flags)
safe_syscall3(ssize_t, recvmsg, int, fd, struct msghdr *, msg, int, flags)
#ifdef __NR_msgsnd
safe_syscall4(int, msgsnd, int, msgid, const void *, msgp, size_t, sz,
int, flags)
safe_syscall5(int, msgrcv, int, msgid, void *, msgp, size_t, sz,
long, msgtype, int, flags)
#else
/* This host kernel architecture uses a single ipc syscall; fake up
* wrappers for the sub-operations to hide this implementation detail.
* Annoyingly we can't include linux/ipc.h to get the constant definitions
* for the call parameter because some structs in there conflict with the
* sys/ipc.h ones. So we just define them here, and rely on them being
* the same for all host architectures.
*/
#define Q_MSGSND 11
#define Q_MSGRCV 12
#define Q_IPCCALL(VERSION, OP) ((VERSION) << 16 | (OP))
safe_syscall6(int, ipc, int, call, long, first, long, second, long, third,
void *, ptr, long, fifth)
static int safe_msgsnd(int msgid, const void *msgp, size_t sz, int flags)
{
return safe_ipc(Q_IPCCALL(0, Q_MSGSND), msgid, sz, flags, (void *)msgp, 0);
}
static int safe_msgrcv(int msgid, void *msgp, size_t sz, long type, int flags)
{
return safe_ipc(Q_IPCCALL(1, Q_MSGRCV), msgid, sz, flags, msgp, type);
}
#endif
static inline int host_to_target_sock_type(int host_type)
{
@ -3796,7 +3824,7 @@ static inline abi_long do_msgsnd(int msqid, abi_long msgp,
}
host_mb->mtype = (abi_long) tswapal(target_mb->mtype);
memcpy(host_mb->mtext, target_mb->mtext, msgsz);
ret = get_errno(msgsnd(msqid, host_mb, msgsz, msgflg));
ret = get_errno(safe_msgsnd(msqid, host_mb, msgsz, msgflg));
g_free(host_mb);
unlock_user_struct(target_mb, msgp, 0);
@ -3824,7 +3852,7 @@ static inline abi_long do_msgrcv(int msqid, abi_long msgp,
ret = -TARGET_ENOMEM;
goto end;
}
ret = get_errno(msgrcv(msqid, host_mb, msgsz, msgtyp, msgflg));
ret = get_errno(safe_msgrcv(msqid, host_mb, msgsz, msgtyp, msgflg));
if (ret > 0) {
abi_ulong target_mtext_addr = msgp + sizeof(abi_ulong);