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Handle recv[m]msg for non-native 32-bit personality syscalls

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* net.c (printmsghdr): If current_wordsize is 4 and long is wider than it,
read 32-bit struct msghdr and expand it into a native one before using it.
(printmmsghdr): Likewise for struct mmsghdr.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-02-12 11:57:48 +01:00
parent afea7dd4a5
commit 3e759d4293
1 changed files with 56 additions and 4 deletions
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60
net.c
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@ -1428,11 +1428,42 @@ do_msghdr(struct tcb *tcp, struct msghdr *msg, unsigned long data_size)
tprints("}");
}
struct msghdr32 {
uint32_t /* void* */ msg_name;
uint32_t /* socklen_t */msg_namelen;
uint32_t /* iovec* */ msg_iov;
uint32_t /* size_t */ msg_iovlen;
uint32_t /* void* */ msg_control;
uint32_t /* size_t */ msg_controllen;
uint32_t /* int */ msg_flags;
};
struct mmsghdr32 {
struct msghdr32 msg_hdr;
uint32_t /* unsigned */ msg_len;
};
static void
printmsghdr(struct tcb *tcp, long addr, unsigned long data_size)
{
struct msghdr msg;
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize == 4) {
struct msghdr32 msg32;
if (umove(tcp, addr, &msg32) < 0) {
tprintf("%#lx", addr);
return;
}
msg.msg_name = (void*)(long)msg32.msg_name;
msg.msg_namelen = msg32.msg_namelen;
msg.msg_iov = (void*)(long)msg32.msg_iov;
msg.msg_iovlen = msg32.msg_iovlen;
msg.msg_control = (void*)(long)msg32.msg_control;
msg.msg_controllen = msg32.msg_controllen;
msg.msg_flags = msg32.msg_flags;
} else
#endif
if (umove(tcp, addr, &msg) < 0) {
tprintf("%#lx", addr);
return;
@ -1448,10 +1479,31 @@ printmmsghdr(struct tcb *tcp, long addr, unsigned int idx, unsigned long msg_len
unsigned msg_len;
} mmsg;
addr += sizeof(mmsg) * idx;
if (umove(tcp, addr, &mmsg) < 0) {
tprintf("%#lx", addr);
return;
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize == 4) {
struct mmsghdr32 mmsg32;
addr += sizeof(mmsg32) * idx;
if (umove(tcp, addr, &mmsg32) < 0) {
tprintf("%#lx", addr);
return;
}
mmsg.msg_hdr.msg_name = (void*)(long)mmsg32.msg_hdr.msg_name;
mmsg.msg_hdr.msg_namelen = mmsg32.msg_hdr.msg_namelen;
mmsg.msg_hdr.msg_iov = (void*)(long)mmsg32.msg_hdr.msg_iov;
mmsg.msg_hdr.msg_iovlen = mmsg32.msg_hdr.msg_iovlen;
mmsg.msg_hdr.msg_control = (void*)(long)mmsg32.msg_hdr.msg_control;
mmsg.msg_hdr.msg_controllen = mmsg32.msg_hdr.msg_controllen;
mmsg.msg_hdr.msg_flags = mmsg32.msg_hdr.msg_flags;
mmsg.msg_len = mmsg32.msg_len;
} else
#endif
{
addr += sizeof(mmsg) * idx;
if (umove(tcp, addr, &mmsg) < 0) {
tprintf("%#lx", addr);
return;
}
}
tprints("{");
do_msghdr(tcp, &mmsg.msg_hdr, msg_len ? msg_len : mmsg.msg_len);