process_vm_readv issue?

[Denys Vlasenko]

On 02/11/2013 01:05 AM, Ali Polatel wrote:
> Hello,
> 
> The following issue looks like a strace bug.
> 
> strace: strace -- version 4.7
> uname: Linux hayalet 3.7.6 #5 SMP PREEMPT Mon Feb 4 11:40:36 EET 2013 x86_64 GNU/Linux
>     CONFIG_CROSS_MEMORY_ATTACH=y
> 
> Compiling:
> 
> #include <stdlib.h>
> #include <sys/types.h>
> #include <ifaddrs.h>
> 
> int main(int argc, char **argv)
> {
>     int r;
>     struct ifaddrs *ifa = NULL;
> 
>     r = getifaddrs(&ifa);
>     if (r && !ifa)
>         return EXIT_FAILURE;
>     return EXIT_SUCCESS;
> }
> 
> on my x86_64 system with -m32 and running under strace yields the
> following output:
> 
> execve("/home/alip/src/sydbox/a.out", ["/home/alip/src/sydbox/a.out"], [/* 123 vars */]) = 0
> [ Process PID=29370 runs in 32 bit mode. ]
> <snip>
> socket(PF_NETLINK, SOCK_RAW, 0)         = 4
> bind(4, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
> getsockname(4, {sa_family=AF_NETLINK, pid=29370, groups=00000000}, [12]) = 0
> time(NULL)                              = 1360540866
> sendto(4, "\24\0\0\0\22\0\1\3\3024\30Q\0\0\0\0\0\0\0\0", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
> recvmsg(4, {msg_name(-4176776)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(85899345920)=[process_vm_readv: Bad address
> ?] 0, msg_controllen=0, msg_flags=MSG_PROXY}, 0) = 3080
> brk(0)                                  = 0x9abf000
> brk(0x9ae0000)                          = 0x9ae0000
> recvmsg(4, {msg_name(-4176776)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(85899345920)=[process_vm_readv: Bad address
> ?] 0, msg_controllen=0, msg_flags=MSG_PROXY}, 0) = 20
> sendto(4, "\24\0\0\0\26\0\1\3\3034\30Q\0\0\0\0\0\0\0\0", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
> recvmsg(4, {msg_name(-4176776)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(85899345920)=[process_vm_readv: Bad address
> ?] 0, msg_controllen=0, msg_flags=MSG_PROXY}, 0) = 108
> recvmsg(4, {msg_name(-4176776)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(85899345920)=[process_vm_readv: Bad address
> ?] 0, msg_controllen=0, msg_flags=MSG_PROXY}, 0) = 128
> recvmsg(4, {msg_name(-4176776)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(85899345920)=[process_vm_readv: Bad address
> ?] 0, msg_controllen=0, msg_flags=MSG_PROXY}, 0) = 20
> close(4)                                = 0
> exit_group(0)                           = ?
> +++ exited with 0 +++
> 
> Notice the "process_vm_readv: Bad address" messages.

Please try the attached patch
-- 
vda

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