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linux-user: unix sockets - fix running dbus 

dbus sends too short (according to man 7 unix) addrlen for it's
unix socket. I've been told that happens with other applications
as well. Linux kernel doesn't appear to mind, so I guess
we whould be tolerant as well. Expand sockaddr with +1 to fit
the \0 of the pathname passed.

(scratchbox1 qemu had a very different workaround for the same issue).

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7116 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-04-15 16:11:59 +00:00
parent 7d8cec95c8
commit 607175e0fb
1 changed files with 27 additions and 2 deletions
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29
linux-user/syscall.c
View File

@ -44,6 +44,7 @@
#include <signal.h>
#include <sched.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/times.h>
@ -735,13 +736,37 @@ static inline abi_long target_to_host_sockaddr(struct sockaddr *addr,
abi_ulong target_addr,
socklen_t len)
{
const socklen_t unix_maxlen = sizeof (struct sockaddr_un);
sa_family_t sa_family;
struct target_sockaddr *target_saddr;
target_saddr = lock_user(VERIFY_READ, target_addr, len, 1);
if (!target_saddr)
return -TARGET_EFAULT;
sa_family = tswap16(target_saddr->sa_family);
/* Oops. The caller might send a incomplete sun_path; sun_path
* must be terminated by \0 (see the manual page), but
* unfortunately it is quite common to specify sockaddr_un
* length as "strlen(x->sun_path)" while it should be
* "strlen(...) + 1". We'll fix that here if needed.
* Linux kernel has a similar feature.
*/
if (sa_family == AF_UNIX) {
if (len < unix_maxlen && len > 0) {
char *cp = (char*)target_saddr;
if ( cp[len-1] && !cp[len] )
len++;
}
if (len > unix_maxlen)
len = unix_maxlen;
}
memcpy(addr, target_saddr, len);
addr->sa_family = tswap16(target_saddr->sa_family);
addr->sa_family = sa_family;
unlock_user(target_saddr, target_addr, 0);
return 0;
@ -1195,7 +1220,7 @@ static abi_long do_bind(int sockfd, abi_ulong target_addr,
if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
return -TARGET_EINVAL;
addr = alloca(addrlen);
addr = alloca(addrlen+1);
target_to_host_sockaddr(addr, target_addr, addrlen);
return get_errno(bind(sockfd, addr, addrlen));