strace/mmsghdr.c

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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>
* Copyright (c) 2016-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "msghdr.h"
#include "xstring.h"
#include <limits.h>
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,
const kernel_ulong_t addr,
const unsigned int len, void *const mh)
{
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>
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return (entering(tcp) || !syserror(tcp)) &&
fetch_struct_mmsghdr(tcp, addr, mh);
}
struct print_struct_mmsghdr_config {
const int *p_user_msg_namelen;
unsigned int msg_len_vlen;
unsigned int count;
bool use_msg_len;
};
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,
c->use_msg_len ? mmsg->msg_len : (kernel_ulong_t) -1);
if (c->msg_len_vlen) {
tprintf(", msg_len=%u", mmsg->msg_len);
--c->msg_len_vlen;
}
tprints("}");
if (c->p_user_msg_namelen)
++c->p_user_msg_namelen;
return true;
}
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
save_mmsgvec_namelen(struct tcb *const tcp, kernel_ulong_t addr,
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);
}
static void
decode_mmsgvec(struct tcb *const tcp, const kernel_ulong_t addr,
const unsigned int vlen, const unsigned int msg_len_vlen,
const bool use_msg_len)
{
struct mmsghdr mmsg;
struct print_struct_mmsghdr_config c = {
.msg_len_vlen = msg_len_vlen,
.count = IOV_MAX,
.use_msg_len = use_msg_len
};
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;
}
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,
print_struct_mmsghdr, &c);
}
void
dumpiov_in_mmsghdr(struct tcb *const tcp, kernel_ulong_t addr)
{
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;
tprintf(" = %" PRI_klu " buffers in vector %u\n",
(kernel_ulong_t) mmsg.msg_hdr.msg_iovlen, i);
dumpiov_upto(tcp, mmsg.msg_hdr.msg_iovlen,
ptr_to_kulong(mmsg.msg_hdr.msg_iov),
mmsg.msg_len);
}
}
SYS_FUNC(sendmmsg)
{
if (entering(tcp)) {
/* sockfd */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
if (!verbose(tcp)) {
/* msgvec */
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 {
const unsigned int msg_len_vlen =
syserror(tcp) ? 0 : tcp->u_rval;
/* msgvec */
temporarily_clear_syserror(tcp);
decode_mmsgvec(tcp, tcp->u_arg[1], tcp->u_arg[2],
msg_len_vlen, false);
restore_cleared_syserror(tcp);
/* 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)) {
save_mmsgvec_namelen(tcp, tcp->u_arg[1], tcp->u_arg[2],
sprint_timespec(tcp, tcp->u_arg[4]));
} else {
/* msgvec */
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)) {
/* msgvec */
decode_mmsgvec(tcp, tcp->u_arg[1], tcp->u_rval,
tcp->u_rval, true);
/* vlen */
tprintf(", %u, ", (unsigned int) tcp->u_arg[2]);
/* flags */
printflags(msg_flags, tcp->u_arg[3], "MSG_???");
tprints(", ");
/* timeout on entrance */
tprints(*(const char **) get_tcb_priv_data(tcp));
}
if (syserror(tcp))
return 0;
if (tcp->u_rval == 0) {
tcp->auxstr = "Timeout";
return RVAL_STR;
}
if (!verbose(tcp) || !tcp->u_arg[4])
return 0;
/* timeout on exit */
static char str[sizeof("left") + TIMESPEC_TEXT_BUFSIZE];
xsprintf(str, "left %s", sprint_timespec(tcp, tcp->u_arg[4]));
tcp->auxstr = str;
return RVAL_STR;
}
}