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tnt_syswrap.c
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/*--------------------------------------------------------------------*/
/*--- Wrappers for tainting syscalls ---*/
/*--- tnt_syswrap.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Taintgrind, a Valgrind tool for
tracking marked/tainted data through memory.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_tool_basics.h"
#include "pub_tool_vki.h"
#include "pub_tool_vkiscnums.h"
#include "pub_tool_hashtable.h"
#include "pub_tool_tooliface.h"
#include "pub_tool_libcbase.h"
#include "pub_tool_libcassert.h"
#include "pub_tool_libcprint.h"
#include "pub_tool_libcproc.h"
#include "pub_tool_libcfile.h"
#include "pub_tool_machine.h"
#include "pub_tool_aspacemgr.h"
#include "pub_tool_threadstate.h"
#include "pub_tool_stacktrace.h" // for VG_(get_and_pp_StackTrace)
#include "pub_tool_debuginfo.h" // VG_(describe_IP), VG_(get_fnname)
#include "valgrind.h"
#include "tnt_include.h"
// macros
#define KRED "\e[31m"
#define KGRN "\e[32m"
#define KMAG "\e[35m"
#define KNRM "\e[0m"
static
void resolve_filename(UWord fd, HChar *path, Int max)
{
HChar src[FD_MAX_PATH];
Int len = 0;
// TODO: Cache resolved fds by also catching open()s and close()s
VG_(sprintf)(src, "/proc/%d/fd/%d", VG_(getpid)(), (int)fd);
len = VG_(readlink)(src, path, max);
// Just give emptiness on error.
if (len == -1) len = 0;
path[len] = '\0';
}
/* enforce an arbitrary maximum */
#define VG_N_THREADS 500
static Bool tainted_fds[VG_N_THREADS][FD_MAX];
void TNT_(setup_tainted_map)( void ) {
ThreadId t = 0;
VG_(memset)(tainted_fds, False, sizeof(tainted_fds));
/* Taint stdin if specified */
if (TNT_(clo_taint_stdin))
for(t=0; t < VG_N_THREADS; ++t)
tainted_fds[t][0] = True;
}
static UInt read_offset = 0;
void TNT_(syscall_lseek)(ThreadId tid, UWord* args, UInt nArgs,
SysRes res) {
// off_t lseek(int fd, off_t offset, int whence);
Int fd = args[0];
ULong offset = args[1];
UInt whence = args[2];
Bool verbose = False;
if (fd >= FD_MAX || tainted_fds[tid][fd] == False)
return;
Int retval = sr_Res(res);
if ( verbose )
{
VG_(printf)("syscall _lseek %d %d ", (int)tid, fd);
VG_(printf)("offset: 0x%x whence: 0x%x ", (UInt)offset, whence);
VG_(printf)("retval: 0x%x read_offset: 0x%x\n", (UInt)retval, read_offset);
}
if( whence == 0/*SEEK_SET*/ )
read_offset = 0 + (UInt)offset;
else if( whence == 1/*SEEK_CUR*/ )
read_offset += (UInt)offset;
else if( whence == 2/*SEEK_END*/ )
read_offset = retval;
else {
VG_(printf)("whence %x\n", whence);
tl_assert(0);
}
}
void TNT_(syscall_llseek)(ThreadId tid, UWord* args, UInt nArgs,
SysRes res) {
// int _llseek(int fildes, ulong offset_high, ulong offset_low, loff_t *result,, uint whence);
Int fd = args[0];
ULong offset_high = args[1];
ULong offset_low = args[2];
UInt result = args[3];
UInt whence = args[4];
ULong offset;
Bool verbose = False;
if (fd >= FD_MAX || tainted_fds[tid][fd] == False)
return;
Int retval = sr_Res(res);
if ( verbose )
{
VG_(printf)("syscall _llseek %d %d ", (int)tid, fd);
VG_(printf)("0x%x 0x%x 0x%x 0x%x\n", (UInt)offset_high, (UInt)offset_low, result, whence);
VG_(printf)("0x%x\n", (UInt)retval);
}
offset = (offset_high<<32) | offset_low;
if( whence == 0/*SEEK_SET*/ )
read_offset = 0 + (UInt)offset;
else if( whence == 1/*SEEK_CUR*/ )
read_offset += (UInt)offset;
else {//if( whence == 2/*SEEK_END*/ )
VG_(printf)("whence %x\n", whence);
tl_assert(0);
}
}
Bool TNT_(syscall_allowed_check)(ThreadId tid, int syscallno) {
if (IN_SANDBOX && IS_SYSCALL_ALLOWED(syscallno)) {
const HChar *fnname;
TNT_(get_fnname)(tid, &fnname);
VG_(printf)("*** Sandbox performed system call %s (%d) in method %s, but it is not allowed to. ***\n", syscallnames[syscallno], syscallno, fnname);
VG_(get_and_pp_StackTrace)(tid, STACK_TRACE_SIZE);
VG_(printf)("\n");
return False;
}
return True;
}
static
void read_common ( UInt taint_offset, Int taint_len,
UInt curr_offset, Int curr_len,
HChar *data ) {
UWord addr;
Int len;
if( TNT_(clo_taint_all) ){
addr = (UWord)data;
len = curr_len;
}else
//VG_(printf)("curr_offset 0x%x\n", curr_offset);
//VG_(printf)("curr_len 0x%x\n", curr_len);
//VG_(printf)("tnt_offset 0x%x\n", taint_offset);
//VG_(printf)("tnt_len 0x%x\n", taint_len);
/* Here we determine what bytes to taint
We have 4 variables -
taint_offset Starting file offset to taint
taint_len Number of bytes to taint
curr_offset Starting file offset currently read
curr_len Number of bytes currently read
We have to deal with 4 cases: (= refers to the region to be tainted)
Case 1:
taint_len
taint_offset |-----------------|
curr_len
curr_offset |---=================---|
Case 2:
taint_len
taint_offset |-----------------------|
curr_len
curr_offset |---====================|
Case 3:
taint_len
taint_offset |----------------------|
curr_len
curr_offset |====================---|
Case 4:
taint_len
taint_offset |-----------------------|
curr_len
curr_offset |====================|
*/
if( taint_offset >= curr_offset &&
taint_offset <= curr_offset + curr_len ){
if( (taint_offset + taint_len) <= (curr_offset + curr_len) ){
// Case 1
addr = (UWord)(data + taint_offset - curr_offset);
len = taint_len;
}else{
// Case 2
addr = (UWord)(data + taint_offset - curr_offset);
len = curr_len - taint_offset + curr_offset;
}
}else if( ( ( taint_offset + taint_len ) >= curr_offset ) &&
( ( taint_offset + taint_len ) <= (curr_offset + curr_len ) ) ){
// Case 3
addr = (UWord)data;
len = taint_len - curr_offset + taint_offset;
}else if( ( taint_offset <= curr_offset ) &&
( taint_offset + taint_len ) >= ( curr_offset + curr_len ) ){
// Case 4
addr = (UWord)data;
len = curr_len;
}else{
return;
}
if ( TNT_(clo_smt2) )
TNT_(make_mem_tainted_named)( addr, len, "read" );
else
TNT_(make_mem_tainted)( addr, len );
}
void TNT_(syscall_read)(ThreadId tid, UWord* args, UInt nArgs,
SysRes res) {
// ssize_t read(int fildes, void *buf, size_t nbyte);
Int fd = args[0];
HChar *data = (HChar *)args[1];
UInt curr_offset = read_offset;
Int curr_len = sr_Res(res);
UInt taint_offset = TNT_(clo_taint_start);
Int taint_len = TNT_(clo_taint_len);
Bool verbose = False;
TNT_(check_fd_access)(tid, fd, FD_READ);
if (curr_len == 0) return;
TNT_(make_mem_untainted)( (UWord)data, curr_len );
if (fd >= FD_MAX || tainted_fds[tid][fd] == False)
return;
if(verbose){
//VG_(printf)("taint_offset: 0x%x\ttaint_len: 0x%x\n", taint_offset, taint_len);
//VG_(printf)("curr_offset : 0x%x\tcurr_len : 0x%x\n", curr_offset, curr_len);
VG_(printf)("syscall read %d %d ", (int)tid, fd);
#ifdef VGA_amd64
VG_(printf)("0x%x 0x%x 0x%llx 0x%x\n", curr_offset, (unsigned)curr_len, (ULong)data,
*(HChar *)data);
#else
VG_(printf)("0x%x 0x%x 0x%x 0x%x\n", curr_offset, (unsigned)curr_len, (UInt)data,
*(HChar *)data);
#endif
}
if ( !TNT_(clo_smt2) ) {
Int success = TNT_(describe_data)(data, varname, VARNAMESIZE);
if ( istty ) VG_(printf)("%s", KMAG);
if (TNT_(clo_compact))
VG_(printf)("0xFFFFFFFF ");
else
VG_(printf)("0xFFFFFFFF: _syscall_read ");
if ( istty ) VG_(printf)("%s", KNRM);
VG_(printf)("| Read:%d | ", curr_len);
if ( istty ) VG_(printf)("%s", KRED);
VG_(printf)("0x%x", curr_offset);
if ( istty ) VG_(printf)("%s", KNRM);
if (success) VG_(printf)( " | %s:%x\n", varname, data);
else VG_(printf)( " | %s\n", varname );
}
read_common ( taint_offset, taint_len, curr_offset, curr_len, data );
// Update file position
read_offset += curr_len;
// DEBUG
//tnt_read = 1;
}
void TNT_(syscall_pread)(ThreadId tid, UWord* args, UInt nArgs,
SysRes res) {
// ssize_t pread(int fildes, void *buf, size_t nbyte, size_t offset);
Int fd = args[0];
HChar *data = (HChar *)args[1];
UInt curr_offset = (Int)args[3];
Int curr_len = sr_Res(res);
UInt taint_offset = TNT_(clo_taint_start);
Int taint_len = TNT_(clo_taint_len);
Bool verbose = False;
if (curr_len == 0) return;
TNT_(make_mem_untainted)( (UWord)data, curr_len );
if (fd >= FD_MAX || tainted_fds[tid][fd] == False)
return;
if(verbose){
//VG_(printf)("taint_offset: 0x%x\ttaint_len: 0x%x\n", taint_offset, taint_len);
//VG_(printf)("curr_offset : 0x%x\tcurr_len : 0x%x\n", curr_offset, curr_len);
VG_(printf)("syscall pread %d %d ", (int)tid, fd);
#ifdef VGA_amd64
VG_(printf)("0x%x 0x%x 0x%llx\n", curr_offset, (unsigned)curr_len, (ULong)data);
#else
VG_(printf)("0x%x 0x%x 0x%x\n", curr_offset, (unsigned)curr_len, (UInt)data);
#endif
}
if ( !TNT_(clo_smt2) ) {
Int success = TNT_(describe_data)(data, varname, VARNAMESIZE);
if ( istty ) VG_(printf)("%s", KMAG);
if (TNT_(clo_compact))
VG_(printf)("0xFFFFFFFF ");
else
VG_(printf)("0xFFFFFFFF: _syscall_pread ");
if ( istty ) VG_(printf)("%s", KNRM);
VG_(printf)("| Read:%d | ", curr_len);
if ( istty ) VG_(printf)("%s", KRED);
VG_(printf)("0x%x", curr_offset);
if ( istty ) VG_(printf)("%s", KNRM);
if (success) VG_(printf)( " | %s:%x\n", varname, data);
else VG_(printf)( " | %s\n", varname );
}
read_common ( taint_offset, taint_len, curr_offset, curr_len, data );
}
void TNT_(syscall_open)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// int open (const char *filename, int flags[, mode_t mode])
HChar fdpath[FD_MAX_PATH];
Int fd = sr_Res(res);
Bool verbose = False;
// check if we have already created a sandbox
if (have_created_sandbox && !IN_SANDBOX) {
#ifdef VGO_freebsd
VG_(resolve_filename)(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_linux
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_darwin
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#else
#error OS unknown
#endif
const HChar *fnname;
TNT_(get_fnname)(tid, &fnname);
VG_(printf)("*** The file %s (fd: %d) was opened in method %s after a sandbox was created, hence it will not be accessible to the sandbox. It will need to be passed to the sandbox using sendmsg. ***\n", fdpath, fd, fnname);
VG_(get_and_pp_StackTrace)(tid, STACK_TRACE_SIZE);
VG_(printf)("\n");
}
// Nothing to do if no file tainting
if ( VG_(strlen)( TNT_(clo_file_filter)) == 0 && (fd != 0 || !TNT_(clo_taint_stdin)) )
return;
if (fd > -1 && fd < FD_MAX) {
#ifdef VGO_freebsd
VG_(resolve_filename)(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_linux
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_darwin
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#else
#error OS unknown
#endif
if( TNT_(clo_taint_all) ){
// Skip /dev/pts/0
// Skip executables
if ( VG_(strncmp)(fdpath, "/dev/pts/0",
VG_(strlen)("/dev/pts/0")) == 0 ) {
//} else if ( VG_(strncmp)(fdpath + VG_(strlen)(fdpath) - 3, ".so", 3) == 0 ) {
//} else if ( VG_(strncmp)(fdpath + VG_(strlen)(fdpath) - 3, ".py", 3) == 0 ) {
//} else if ( VG_(strncmp)(fdpath + VG_(strlen)(fdpath) - 4, ".pyc", 4) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/usr/bin/", 9) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/usr/local/bin/", 15) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/usr/lib/", 9) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/usr/local/lib/", 15) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/bin/", 5) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/lib/", 5) == 0 ) {
} else if ( VG_(strncmp)(fdpath, "/etc/", 5) == 0 ) {
} else {
tainted_fds[tid][fd] = True;
if ( verbose )
VG_(printf)("syscall open %d %s %lx %d\n", (int)tid, fdpath, args[1], fd);
//if ( verbose )
// VG_(printf)("%s\n", fdpath + VG_(strlen)(fdpath) - 3);
read_offset = 0;
}
} else if ( VG_(strncmp)(fdpath, TNT_(clo_file_filter),
VG_(strlen)( TNT_(clo_file_filter))) == 0 ) {
tainted_fds[tid][fd] = True;
if ( verbose )
VG_(printf)("syscall open %d %s %lx %d\n", (int)tid, fdpath, args[1], fd);
read_offset = 0;
} else if ( TNT_(clo_file_filter)[0] == '*' &&
VG_(strncmp)( fdpath + VG_(strlen)(fdpath)
- VG_(strlen)( TNT_(clo_file_filter) ) + 1,
TNT_(clo_file_filter) + 1,
VG_(strlen)( TNT_(clo_file_filter)) - 1 ) == 0 ) {
// Example: --file-filter=*.pdf
tainted_fds[tid][fd] = True;
if ( verbose )
VG_(printf)("syscall open %d %s %lx %d\n", (int)tid, fdpath, args[1], fd);
read_offset = 0;
} else if (TNT_(clo_taint_stdin)) {
tainted_fds[tid][fd] = True;
if ( verbose )
VG_(printf)("syscall open %d %s %lx %d\n", (int)tid, fdpath, args[1], fd);
} else
tainted_fds[tid][fd] = False;
}
}
void TNT_(syscall_close)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// int close (int filedes)
Int fd = args[0];
if (fd > -1 && fd < FD_MAX){
//if (tainted_fds[tid][fd] == True)
// VG_(printf)("syscall close %d %d\n", tid, fd);
shared_fds[fd] = 0;
tainted_fds[tid][fd] = False;
}
}
void TNT_(syscall_write)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
Int fd = args[0];
TNT_(check_fd_access)(tid, fd, FD_WRITE);
}
void TNT_(get_fnname)(ThreadId tid, const HChar** buf) {
UInt pc = VG_(get_IP)(tid);
DiEpoch ep = VG_(current_DiEpoch)();
VG_(get_fnname)(ep, pc, buf);
}
void TNT_(check_fd_access)(ThreadId tid, UInt fd, Int fd_request) {
if (IN_SANDBOX) {
Bool allowed = shared_fds[fd] & fd_request;
// VG_(printf)("checking if allowed to %s from fd %d ... %d\n", (fd_request == FD_READ ? "read" : "write"), fd, allowed);
if (!allowed) {
const HChar* access_str;
switch (fd_request) {
case FD_READ: {
access_str = "read from";
break;
}
case FD_WRITE: {
access_str = "wrote to";
break;
}
default: {
tl_assert(0);
break;
}
}
HChar fdpath[FD_MAX_PATH];
#ifdef VGO_freebsd
VG_(resolve_filename)(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_linux
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#elif defined VGO_darwin
resolve_filename(fd, fdpath, FD_MAX_PATH-1);
#else
#error OS unknown
#endif
const HChar *fnname;
TNT_(get_fnname)(tid, &fnname);
VG_(printf)("*** Sandbox %s %s (fd: %d) in method %s, but it is not allowed to. ***\n", access_str, fdpath, (int)fd, fnname);
VG_(get_and_pp_StackTrace)(tid, STACK_TRACE_SIZE);
VG_(printf)("\n");
}
}
}
/*** Networking syscalls ***/
void TNT_(syscall_socketcall)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// int socketcall(int call, unsigned long *args);
switch (args[0]) {
#ifdef VKI_SYS_SOCKET
case VKI_SYS_SOCKET:
//VG_(printf)("syscall_socketcall: SOCKET\n");
TNT_(syscall_socket)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_LISTEN
case VKI_SYS_LISTEN:
//TNT_(syscall_listen)(tid, res);
break;
#endif
#ifdef VKI_SYS_ACCEPT
case VKI_SYS_ACCEPT:
//VG_(printf)("syscall_socketcall: ACCEPT\n");
TNT_(syscall_accept)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_CONNECT
case VKI_SYS_CONNECT:
//VG_(printf)("syscall_socketcall: CONNECT\n");
// TODO: submit a syscall hooking patch to valgrind to avoid this.
TNT_(syscall_connect)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_GETPEERNAME
case VKI_SYS_GETPEERNAME:
//VG_(printf)("syscall_socketcall: GETPEERNAME\n");
break;
#endif
#ifdef VKI_SYS_GETSOCKNAME
case VKI_SYS_GETSOCKNAME:
//VG_(printf)("syscall_socketcall: GETSOCKNAME\n");
break;
#endif
#ifdef VKI_SYS_SOCKETPAIR
case VKI_SYS_SOCKETPAIR:
//VG_(printf)("syscall_socketcall: SOCKETPAIR\n");
TNT_(syscall_socketpair)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_RECV
case VKI_SYS_RECV:
// VG_(printf)("syscall_socketcall: RECV\n");
TNT_(syscall_recv)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_RECVMSG
case VKI_SYS_RECVMSG:
//VG_(printf)("syscall_socketcall: RECVMSG\n");
TNT_(syscall_recvmsg)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_RECVFROM
case VKI_SYS_RECVFROM:
//VG_(printf)("syscall_socketcall: RECVFROM\n");
TNT_(syscall_recvfrom)(tid, args, nArgs, res);
break;
#endif
#ifdef VKI_SYS_SHUTDOWN
case VKI_SYS_SHUTDOWN:
// VG_(printf)("syscall_socketcall: SHUTDOWN\n");
break;
#endif
default:
return;
}
}
void TNT_(syscall_socket)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
Int fd = sr_Res(res);
// Nothing to do if no network tainting
if (!TNT_(clo_taint_network))
return;
if (fd > -1 && fd < FD_MAX) {
tainted_fds[tid][fd] = True;
//VG_(printf)("syscall_socket: tainting %d\n", fd);
}
}
void TNT_(syscall_connect)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// Assume this is called directly after arguments have been populated.
Int fd = args[0];
// Nothing to do if no network tainting
if (!TNT_(clo_taint_network))
return;
if (fd > -1 && fd < FD_MAX) {
tainted_fds[tid][fd] = True;
// VG_(printf)("syscall_connect: tainting %d\n", fd);
}
}
void TNT_(syscall_socketpair)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// int socketpair(int domain, int type, int protocol, int sv[2]);
// Assume this is called directly after arguments have been populated.
Int fd = ((Int *)args[3])[0];
// Nothing to do if no network tainting
if (!TNT_(clo_taint_network))
return;
if (fd > -1 && fd < FD_MAX) {
tainted_fds[tid][fd] = True;
// VG_(printf)("syscall_socketpair: tainting fd %d\n", fd);
}
}
void TNT_(syscall_accept)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
Int fd = sr_Res(res);
// Nothing to do if no network tainting
if (!TNT_(clo_taint_network))
return;
if (fd > -1 && fd < FD_MAX) {
tainted_fds[tid][fd] = True;
// VG_(printf)("syscall_connect: tainting %d\n", fd);
}
}
void TNT_(syscall_recv)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// ssize_t recv(int sockfd, void *buf, size_t len, int flags)
Int fd = args[0];
HChar *data = (HChar *)args[1];
Int msglen = sr_Res(res);
//VG_(printf)("syscall recv %d 0x%x 0x%02x\n", tid, msglen, data[0]);
if (fd > -1 && fd < FD_MAX && tainted_fds[tid][fd] == True && msglen > 0) {
TNT_(make_mem_tainted)((UWord)data, msglen);
}
}
void TNT_(syscall_recvfrom)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
// ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags,
// struct sockaddr *src_addr, socklen_t *addrlen)
// TODO: #include <arpa/inet.h> inet_ntop to pretty print IP address
Int fd = args[0];
HChar *data = (HChar *)args[1];
Int msglen = sr_Res(res);
//VG_(printf)("syscall recvfrom %d 0x%x 0x%02x\n", tid, msglen, data[0]);
if (fd > -1 && fd < FD_MAX && tainted_fds[tid][fd] == True && msglen > 0) {
TNT_(make_mem_tainted)((UWord)data, msglen);
}
}
/* Annoyingly uses the struct msghdr from sys/socket.h
* XXX: scatter gather array and readv() not yet supported.d
*/
void TNT_(syscall_recvmsg)(ThreadId tid, UWord* args, UInt nArgs, SysRes res) {
Int fd = args[0];
struct vki_msghdr *msg = (struct vki_msghdr *)args[1];
if (fd > -1 && fd < FD_MAX && tainted_fds[tid][fd] == True && sr_Res(res) > 0) {
// XXX: if MSG_TRUNC, this will taint more memory than it should.
TNT_(make_mem_tainted)((UWord)msg->msg_control, sr_Res(res));
}
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/