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/*
* Copyright ( c ) 2010 Andreas Schwab < schwab @ linux - m68k . org >
* Copyright ( c ) 2012 - 2013 Denys Vlasenko < vda . linux @ googlemail . com >
* Copyright ( c ) 2014 Masatake YAMATO < yamato @ redhat . com >
* Copyright ( c ) 2010 - 2016 Dmitry V . Levin < ldv @ altlinux . org >
2018-02-14 01:00:00 +03:00
* Copyright ( c ) 2016 - 2018 The strace developers .
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* All rights reserved .
*
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* SPDX - License - Identifier : LGPL - 2.1 - or - later
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*/
# include "defs.h"
# include "msghdr.h"
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# include "xstring.h"
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# include <limits.h>
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print_array: enhance printing of unfetchable object addresses
When umoven_func invocation fails to fetch data, it prints the faulty
address. If this happens to a subsequent umoven_func invocation,
the printed address may be undistinguishable from a valid data printed
by print_func, e.g. when the data is printed in a numeric form like
[0x1, 0x2, 0x3, 0xdefaced].
Fix this source of confusion by moving the printing of the faulty
address from umoven_func to print_array itself. This change renames
umoven_func to tfetch_mem_func and changes its semantics, so that
- tfetch_mem_func never prints anything;
- tfetch_mem_func returns true if the fetch succeeded,
and false otherwise.
* defs.h (print_array): Replace umoven_func argument with
tfetch_mem_func.
* util.c (print_array): Replace umoven_func argument with
tfetch_mem_func, document expected tfetch_mem_func return value
semantics. When tfetch_mem_func returns false, print either addr
or "... /* addr */" depending on the context (inside the array or not).
* bpf.c (print_ebpf_prog, print_bpf_prog_info,
BEGIN_BPF_CMD_DECODER(BPF_PROG_QUERY)): Replace umoven_or_printaddr
argument of print_array with tfetch_mem.
* bpf_filter.c (print_bpf_fprog): Likewise.
* btrfs.c (btrfs_print_logical_ino_container,
btrfs_print_ino_path_container, btrfs_print_qgroup_inherit,
btrfs_ioctl): Likewise.
* dm.c (dm_decode_dm_target_deps): Likewise.
* epoll.c (epoll_wait_common): Likewise.
* file_ioctl.c (file_ioctl): Likewise.
* ipc_sem.c (tprint_sembuf_array): Likewise.
* kexec.c (print_kexec_segments): Likewise.
* mem.c (SYS_FUNC(subpage_prot)): Likewise.
* net.c (print_getsockopt): Likewise.
* netlink.c (decode_nlmsgerr_attr_cookie): Likewise.
* netlink_netlink_diag.c (decode_netlink_diag_groups): Likewise.
* netlink_packet_diag.c (decode_packet_diag_mclist): Likewise.
* netlink_unix_diag.c (decode_unix_diag_inode): Likewise.
* nlattr.c (decode_nla_meminfo): Likewise.
* numa.c (print_nodemask, SYS_FUNC(move_pages),
* perf_ioctl.c (perf_ioctl_query_bpf): Likewise.
* poll.c (decode_poll_entering): Likewise.
* printsiginfo.c (print_siginfo_array): Likewise.
* rtnl_tc.c (decode_tca_stab_data): Likewise.
* sock.c (decode_ifconf): Likewise.
* uid.c (print_groups): Likewise.
* io.c (SYS_FUNC(io_submit), SYS_FUNC(io_getevents)): Replace
umoven_or_printaddr argument of print_array with tfetch_mem.
(tprint_iov_upto): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* v4l2.c (print_v4l2_format_fmt): Replace umoven_or_printaddr argument
of print_array with tfetch_mem.
(print_v4l2_ext_controls): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* mmsghdr.c (fetch_struct_mmsghdr_or_printaddr): Rename
to fetch_struct_mmsghdr_for_print, do not print address, return bool.
(decode_mmsgvec): Replace fetch_struct_mmsghdr_or_printaddr
with fetch_struct_mmsghdr_for_print.
* tests/aio.c (main): Update expected output.
* tests/bpf.c (print_BPF_PROG_QUERY_attr5): Likewise.
* tests/ioctl_perf-success.c (main): Likewise.
* tests/ioctl_v4l2.c (main): Update expected output.
* tests/kexec_load.c (main): Likewise.
* tests/mmsg_name.c (test_mmsg_name): Update expected output.
* tests/move_pages.c (print_page_array, print_node_array): Likewise.
* tests/poll.c (print_pollfd_array_entering): Likewise.
* tests/preadv-pwritev.c (main): Likewise.
* tests/preadv2-pwritev2.c (dumpio): Likewise.
* tests/process_vm_readv_writev.c (print_iov): Likewise.
* tests/pwritev.c (print_iovec): Likewise.
* tests/readv.c (main): Likewise.
* tests/seccomp-filter-v.c
* tests/semop.c (main): Likewise.
* tests/set_mempolicy.c (print_nodes): Likewise.
* tests/setgroups.c (main): Likewise.
* tests/test_nlattr.h (print_nlattr) Likewise.
Co-Authored-by: Eugene Syromyatnikov <evgsyr@gmail.com>
2018-05-29 04:15:19 +03:00
static bool
fetch_struct_mmsghdr_for_print ( struct tcb * const tcp ,
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const kernel_ulong_t addr ,
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const unsigned int len , void * const mh )
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{
print_array: enhance printing of unfetchable object addresses
When umoven_func invocation fails to fetch data, it prints the faulty
address. If this happens to a subsequent umoven_func invocation,
the printed address may be undistinguishable from a valid data printed
by print_func, e.g. when the data is printed in a numeric form like
[0x1, 0x2, 0x3, 0xdefaced].
Fix this source of confusion by moving the printing of the faulty
address from umoven_func to print_array itself. This change renames
umoven_func to tfetch_mem_func and changes its semantics, so that
- tfetch_mem_func never prints anything;
- tfetch_mem_func returns true if the fetch succeeded,
and false otherwise.
* defs.h (print_array): Replace umoven_func argument with
tfetch_mem_func.
* util.c (print_array): Replace umoven_func argument with
tfetch_mem_func, document expected tfetch_mem_func return value
semantics. When tfetch_mem_func returns false, print either addr
or "... /* addr */" depending on the context (inside the array or not).
* bpf.c (print_ebpf_prog, print_bpf_prog_info,
BEGIN_BPF_CMD_DECODER(BPF_PROG_QUERY)): Replace umoven_or_printaddr
argument of print_array with tfetch_mem.
* bpf_filter.c (print_bpf_fprog): Likewise.
* btrfs.c (btrfs_print_logical_ino_container,
btrfs_print_ino_path_container, btrfs_print_qgroup_inherit,
btrfs_ioctl): Likewise.
* dm.c (dm_decode_dm_target_deps): Likewise.
* epoll.c (epoll_wait_common): Likewise.
* file_ioctl.c (file_ioctl): Likewise.
* ipc_sem.c (tprint_sembuf_array): Likewise.
* kexec.c (print_kexec_segments): Likewise.
* mem.c (SYS_FUNC(subpage_prot)): Likewise.
* net.c (print_getsockopt): Likewise.
* netlink.c (decode_nlmsgerr_attr_cookie): Likewise.
* netlink_netlink_diag.c (decode_netlink_diag_groups): Likewise.
* netlink_packet_diag.c (decode_packet_diag_mclist): Likewise.
* netlink_unix_diag.c (decode_unix_diag_inode): Likewise.
* nlattr.c (decode_nla_meminfo): Likewise.
* numa.c (print_nodemask, SYS_FUNC(move_pages),
* perf_ioctl.c (perf_ioctl_query_bpf): Likewise.
* poll.c (decode_poll_entering): Likewise.
* printsiginfo.c (print_siginfo_array): Likewise.
* rtnl_tc.c (decode_tca_stab_data): Likewise.
* sock.c (decode_ifconf): Likewise.
* uid.c (print_groups): Likewise.
* io.c (SYS_FUNC(io_submit), SYS_FUNC(io_getevents)): Replace
umoven_or_printaddr argument of print_array with tfetch_mem.
(tprint_iov_upto): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* v4l2.c (print_v4l2_format_fmt): Replace umoven_or_printaddr argument
of print_array with tfetch_mem.
(print_v4l2_ext_controls): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* mmsghdr.c (fetch_struct_mmsghdr_or_printaddr): Rename
to fetch_struct_mmsghdr_for_print, do not print address, return bool.
(decode_mmsgvec): Replace fetch_struct_mmsghdr_or_printaddr
with fetch_struct_mmsghdr_for_print.
* tests/aio.c (main): Update expected output.
* tests/bpf.c (print_BPF_PROG_QUERY_attr5): Likewise.
* tests/ioctl_perf-success.c (main): Likewise.
* tests/ioctl_v4l2.c (main): Update expected output.
* tests/kexec_load.c (main): Likewise.
* tests/mmsg_name.c (test_mmsg_name): Update expected output.
* tests/move_pages.c (print_page_array, print_node_array): Likewise.
* tests/poll.c (print_pollfd_array_entering): Likewise.
* tests/preadv-pwritev.c (main): Likewise.
* tests/preadv2-pwritev2.c (dumpio): Likewise.
* tests/process_vm_readv_writev.c (print_iov): Likewise.
* tests/pwritev.c (print_iovec): Likewise.
* tests/readv.c (main): Likewise.
* tests/seccomp-filter-v.c
* tests/semop.c (main): Likewise.
* tests/set_mempolicy.c (print_nodes): Likewise.
* tests/setgroups.c (main): Likewise.
* tests/test_nlattr.h (print_nlattr) Likewise.
Co-Authored-by: Eugene Syromyatnikov <evgsyr@gmail.com>
2018-05-29 04:15:19 +03:00
return ( entering ( tcp ) | | ! syserror ( tcp ) ) & &
fetch_struct_mmsghdr ( tcp , addr , mh ) ;
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}
struct print_struct_mmsghdr_config {
const int * p_user_msg_namelen ;
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unsigned int msg_len_vlen ;
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unsigned int count ;
bool use_msg_len ;
} ;
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static bool
print_struct_mmsghdr ( struct tcb * tcp , void * elem_buf ,
size_t elem_size , void * data )
{
const struct mmsghdr * const mmsg = elem_buf ;
struct print_struct_mmsghdr_config * const c = data ;
if ( ! c - > count ) {
tprints ( " ... " ) ;
return false ;
}
- - c - > count ;
tprints ( " {msg_hdr= " ) ;
print_struct_msghdr ( tcp , & mmsg - > msg_hdr , c - > p_user_msg_namelen ,
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c - > use_msg_len ? mmsg - > msg_len : ( kernel_ulong_t ) - 1 ) ;
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if ( c - > msg_len_vlen ) {
tprintf ( " , msg_len=%u " , mmsg - > msg_len ) ;
- - c - > msg_len_vlen ;
}
tprints ( " } " ) ;
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if ( c - > p_user_msg_namelen )
+ + c - > p_user_msg_namelen ;
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return true ;
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}
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static void
free_mmsgvec_data ( void * ptr )
{
char * * pstr = ptr ;
free ( * pstr ) ;
* pstr = 0 ;
free ( ptr ) ;
}
struct mmsgvec_data {
char * timeout ;
unsigned int count ;
int namelen [ IOV_MAX ] ;
} ;
static void
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save_mmsgvec_namelen ( struct tcb * const tcp , kernel_ulong_t addr ,
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unsigned int len , const char * const timeout )
{
if ( len > IOV_MAX )
len = IOV_MAX ;
const size_t data_size = offsetof ( struct mmsgvec_data , namelen )
+ sizeof ( int ) * len ;
struct mmsgvec_data * const data = xmalloc ( data_size ) ;
data - > timeout = xstrdup ( timeout ) ;
unsigned int i , fetched ;
for ( i = 0 ; i < len ; + + i , addr + = fetched ) {
struct mmsghdr mh ;
fetched = fetch_struct_mmsghdr ( tcp , addr , & mh ) ;
if ( ! fetched )
break ;
data - > namelen [ i ] = mh . msg_hdr . msg_namelen ;
}
data - > count = i ;
set_tcb_priv_data ( tcp , data , free_mmsgvec_data ) ;
}
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static void
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decode_mmsgvec ( struct tcb * const tcp , const kernel_ulong_t addr ,
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const unsigned int vlen , const unsigned int msg_len_vlen ,
const bool use_msg_len )
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{
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struct mmsghdr mmsg ;
struct print_struct_mmsghdr_config c = {
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. msg_len_vlen = msg_len_vlen ,
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. count = IOV_MAX ,
. use_msg_len = use_msg_len
} ;
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const struct mmsgvec_data * const data = get_tcb_priv_data ( tcp ) ;
if ( data ) {
if ( data - > count < c . count )
c . count = data - > count ;
c . p_user_msg_namelen = data - > namelen ;
}
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2016-07-18 19:25:25 +03:00
print_array ( tcp , addr , vlen , & mmsg , sizeof_struct_mmsghdr ( ) ,
print_array: enhance printing of unfetchable object addresses
When umoven_func invocation fails to fetch data, it prints the faulty
address. If this happens to a subsequent umoven_func invocation,
the printed address may be undistinguishable from a valid data printed
by print_func, e.g. when the data is printed in a numeric form like
[0x1, 0x2, 0x3, 0xdefaced].
Fix this source of confusion by moving the printing of the faulty
address from umoven_func to print_array itself. This change renames
umoven_func to tfetch_mem_func and changes its semantics, so that
- tfetch_mem_func never prints anything;
- tfetch_mem_func returns true if the fetch succeeded,
and false otherwise.
* defs.h (print_array): Replace umoven_func argument with
tfetch_mem_func.
* util.c (print_array): Replace umoven_func argument with
tfetch_mem_func, document expected tfetch_mem_func return value
semantics. When tfetch_mem_func returns false, print either addr
or "... /* addr */" depending on the context (inside the array or not).
* bpf.c (print_ebpf_prog, print_bpf_prog_info,
BEGIN_BPF_CMD_DECODER(BPF_PROG_QUERY)): Replace umoven_or_printaddr
argument of print_array with tfetch_mem.
* bpf_filter.c (print_bpf_fprog): Likewise.
* btrfs.c (btrfs_print_logical_ino_container,
btrfs_print_ino_path_container, btrfs_print_qgroup_inherit,
btrfs_ioctl): Likewise.
* dm.c (dm_decode_dm_target_deps): Likewise.
* epoll.c (epoll_wait_common): Likewise.
* file_ioctl.c (file_ioctl): Likewise.
* ipc_sem.c (tprint_sembuf_array): Likewise.
* kexec.c (print_kexec_segments): Likewise.
* mem.c (SYS_FUNC(subpage_prot)): Likewise.
* net.c (print_getsockopt): Likewise.
* netlink.c (decode_nlmsgerr_attr_cookie): Likewise.
* netlink_netlink_diag.c (decode_netlink_diag_groups): Likewise.
* netlink_packet_diag.c (decode_packet_diag_mclist): Likewise.
* netlink_unix_diag.c (decode_unix_diag_inode): Likewise.
* nlattr.c (decode_nla_meminfo): Likewise.
* numa.c (print_nodemask, SYS_FUNC(move_pages),
* perf_ioctl.c (perf_ioctl_query_bpf): Likewise.
* poll.c (decode_poll_entering): Likewise.
* printsiginfo.c (print_siginfo_array): Likewise.
* rtnl_tc.c (decode_tca_stab_data): Likewise.
* sock.c (decode_ifconf): Likewise.
* uid.c (print_groups): Likewise.
* io.c (SYS_FUNC(io_submit), SYS_FUNC(io_getevents)): Replace
umoven_or_printaddr argument of print_array with tfetch_mem.
(tprint_iov_upto): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* v4l2.c (print_v4l2_format_fmt): Replace umoven_or_printaddr argument
of print_array with tfetch_mem.
(print_v4l2_ext_controls): Replace umoven_or_printaddr_ignore_syserror
with tfetch_mem_ignore_syserror.
* mmsghdr.c (fetch_struct_mmsghdr_or_printaddr): Rename
to fetch_struct_mmsghdr_for_print, do not print address, return bool.
(decode_mmsgvec): Replace fetch_struct_mmsghdr_or_printaddr
with fetch_struct_mmsghdr_for_print.
* tests/aio.c (main): Update expected output.
* tests/bpf.c (print_BPF_PROG_QUERY_attr5): Likewise.
* tests/ioctl_perf-success.c (main): Likewise.
* tests/ioctl_v4l2.c (main): Update expected output.
* tests/kexec_load.c (main): Likewise.
* tests/mmsg_name.c (test_mmsg_name): Update expected output.
* tests/move_pages.c (print_page_array, print_node_array): Likewise.
* tests/poll.c (print_pollfd_array_entering): Likewise.
* tests/preadv-pwritev.c (main): Likewise.
* tests/preadv2-pwritev2.c (dumpio): Likewise.
* tests/process_vm_readv_writev.c (print_iov): Likewise.
* tests/pwritev.c (print_iovec): Likewise.
* tests/readv.c (main): Likewise.
* tests/seccomp-filter-v.c
* tests/semop.c (main): Likewise.
* tests/set_mempolicy.c (print_nodes): Likewise.
* tests/setgroups.c (main): Likewise.
* tests/test_nlattr.h (print_nlattr) Likewise.
Co-Authored-by: Eugene Syromyatnikov <evgsyr@gmail.com>
2018-05-29 04:15:19 +03:00
fetch_struct_mmsghdr_for_print ,
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print_struct_mmsghdr , & c ) ;
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}
void
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dumpiov_in_mmsghdr ( struct tcb * const tcp , kernel_ulong_t addr )
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{
unsigned int len = tcp - > u_rval ;
unsigned int i , fetched ;
struct mmsghdr mmsg ;
for ( i = 0 ; i < len ; + + i , addr + = fetched ) {
fetched = fetch_struct_mmsghdr ( tcp , addr , & mmsg ) ;
if ( ! fetched )
break ;
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tprintf ( " = % " PRI_klu " buffers in vector %u \n " ,
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( kernel_ulong_t ) mmsg . msg_hdr . msg_iovlen , i ) ;
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dumpiov_upto ( tcp , mmsg . msg_hdr . msg_iovlen ,
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ptr_to_kulong ( mmsg . msg_hdr . msg_iov ) ,
mmsg . msg_len ) ;
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}
}
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SYS_FUNC ( sendmmsg )
{
if ( entering ( tcp ) ) {
/* sockfd */
printfd ( tcp , tcp - > u_arg [ 0 ] ) ;
tprints ( " , " ) ;
if ( ! verbose ( tcp ) ) {
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/* msgvec */
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printaddr ( tcp - > u_arg [ 1 ] ) ;
/* vlen */
tprintf ( " , %u, " , ( unsigned int ) tcp - > u_arg [ 2 ] ) ;
/* flags */
printflags ( msg_flags , tcp - > u_arg [ 3 ] , " MSG_??? " ) ;
return RVAL_DECODED ;
}
} else {
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const unsigned int msg_len_vlen =
syserror ( tcp ) ? 0 : tcp - > u_rval ;
/* msgvec */
temporarily_clear_syserror ( tcp ) ;
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decode_mmsgvec ( tcp , tcp - > u_arg [ 1 ] , tcp - > u_arg [ 2 ] ,
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msg_len_vlen , false ) ;
restore_cleared_syserror ( tcp ) ;
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/* vlen */
tprintf ( " , %u, " , ( unsigned int ) tcp - > u_arg [ 2 ] ) ;
/* flags */
printflags ( msg_flags , tcp - > u_arg [ 3 ] , " MSG_??? " ) ;
}
return 0 ;
}
SYS_FUNC ( recvmmsg )
{
if ( entering ( tcp ) ) {
printfd ( tcp , tcp - > u_arg [ 0 ] ) ;
tprints ( " , " ) ;
if ( verbose ( tcp ) ) {
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save_mmsgvec_namelen ( tcp , tcp - > u_arg [ 1 ] , tcp - > u_arg [ 2 ] ,
sprint_timespec ( tcp , tcp - > u_arg [ 4 ] ) ) ;
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} else {
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/* msgvec */
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printaddr ( tcp - > u_arg [ 1 ] ) ;
/* vlen */
tprintf ( " , %u, " , ( unsigned int ) tcp - > u_arg [ 2 ] ) ;
/* flags */
printflags ( msg_flags , tcp - > u_arg [ 3 ] , " MSG_??? " ) ;
tprints ( " , " ) ;
print_timespec ( tcp , tcp - > u_arg [ 4 ] ) ;
}
return 0 ;
} else {
if ( verbose ( tcp ) ) {
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/* msgvec */
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decode_mmsgvec ( tcp , tcp - > u_arg [ 1 ] , tcp - > u_rval ,
tcp - > u_rval , true ) ;
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/* vlen */
tprintf ( " , %u, " , ( unsigned int ) tcp - > u_arg [ 2 ] ) ;
/* flags */
printflags ( msg_flags , tcp - > u_arg [ 3 ] , " MSG_??? " ) ;
tprints ( " , " ) ;
/* timeout on entrance */
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tprints ( * ( const char * * ) get_tcb_priv_data ( tcp ) ) ;
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}
if ( syserror ( tcp ) )
return 0 ;
if ( tcp - > u_rval = = 0 ) {
tcp - > auxstr = " Timeout " ;
return RVAL_STR ;
}
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if ( ! verbose ( tcp ) | | ! tcp - > u_arg [ 4 ] )
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return 0 ;
/* timeout on exit */
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static char str [ sizeof ( " left " ) + TIMESPEC_TEXT_BUFSIZE ] ;
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xsprintf ( str , " left %s " , sprint_timespec ( tcp , tcp - > u_arg [ 4 ] ) ) ;
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tcp - > auxstr = str ;
return RVAL_STR ;
}
}