From ee1045877a7e226945c7cec2bda80039bd2d0c8e Mon Sep 17 00:00:00 2001 From: Jonathan Neuschäfer Date: Thu, 3 Sep 2015 07:27:26 +0200 Subject: linux-user: fix cmsg conversion in case of multiple headers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently, __target_cmsg_nxthdr compares a pointer derived from target_cmsg against the msg_control field of target_msgh (through subtraction). This failed for me when emulating i386 code under x86_64, because pointers in the host address space and pointers in the guest address space were not the same. This patch passes the initial value of target_cmsg into __target_cmsg_nxthdr. I found and fixed two more related bugs: - __target_cmsg_nxthdr now returns the new cmsg pointer instead of the old one. - tgt_space (in host_to_target_cmsg) doesn't count "sizeof (struct target_cmsghdr)" twice anymore. Reviewed-by: Peter Maydell Signed-off-by: Jonathan Neuschäfer Signed-off-by: Riku Voipio --- linux-user/syscall.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'linux-user/syscall.c') diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 7fbaa8bb67..75ac32c05d 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -1181,7 +1181,7 @@ static inline abi_long target_to_host_cmsg(struct msghdr *msgh, struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh); abi_long msg_controllen; abi_ulong target_cmsg_addr; - struct target_cmsghdr *target_cmsg; + struct target_cmsghdr *target_cmsg, *target_cmsg_start; socklen_t space = 0; msg_controllen = tswapal(target_msgh->msg_controllen); @@ -1189,6 +1189,7 @@ static inline abi_long target_to_host_cmsg(struct msghdr *msgh, goto the_end; target_cmsg_addr = tswapal(target_msgh->msg_control); target_cmsg = lock_user(VERIFY_READ, target_cmsg_addr, msg_controllen, 1); + target_cmsg_start = target_cmsg; if (!target_cmsg) return -TARGET_EFAULT; @@ -1247,7 +1248,8 @@ static inline abi_long target_to_host_cmsg(struct msghdr *msgh, } cmsg = CMSG_NXTHDR(msgh, cmsg); - target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg); + target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg, + target_cmsg_start); } unlock_user(target_cmsg, target_cmsg_addr, 0); the_end: @@ -1261,7 +1263,7 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh, struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh); abi_long msg_controllen; abi_ulong target_cmsg_addr; - struct target_cmsghdr *target_cmsg; + struct target_cmsghdr *target_cmsg, *target_cmsg_start; socklen_t space = 0; msg_controllen = tswapal(target_msgh->msg_controllen); @@ -1269,6 +1271,7 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh, goto the_end; target_cmsg_addr = tswapal(target_msgh->msg_control); target_cmsg = lock_user(VERIFY_WRITE, target_cmsg_addr, msg_controllen, 0); + target_cmsg_start = target_cmsg; if (!target_cmsg) return -TARGET_EFAULT; @@ -1382,14 +1385,15 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh, } target_cmsg->cmsg_len = tswapal(tgt_len); - tgt_space = TARGET_CMSG_SPACE(tgt_len); + tgt_space = TARGET_CMSG_SPACE(len); if (msg_controllen < tgt_space) { tgt_space = msg_controllen; } msg_controllen -= tgt_space; space += tgt_space; cmsg = CMSG_NXTHDR(msgh, cmsg); - target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg); + target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg, + target_cmsg_start); } unlock_user(target_cmsg, target_cmsg_addr, space); the_end: -- cgit 1.4.1