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procctl: make it possible to specify that some operations require debug privilege over the target

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Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32513
This commit is contained in:
Konstantin Belousov 2021-10-15 23:02:06 +03:00
parent 32026f5983
commit 1c4dbee5dd
1 changed files with 27 additions and 2 deletions
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29
sys/kern/kern_procctl.c
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@ -711,6 +711,7 @@ struct procctl_cmd_info {
bool esrch_is_einval : 1;
bool copyout_on_error : 1;
bool no_nonnull_data : 1;
bool need_candebug : 1;
int copyin_sz;
int copyout_sz;
int (*exec)(struct thread *, struct proc *, void *);
@ -719,114 +720,136 @@ static const struct procctl_cmd_info procctl_cmds_info[] = {
[PROC_SPROTECT] =
{ .lock_tree = SA_SLOCKED, .one_proc = false,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = protect_set, .copyout_on_error = false, },
[PROC_REAP_ACQUIRE] =
{ .lock_tree = SA_XLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = true,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = 0,
.exec = reap_acquire, .copyout_on_error = false, },
[PROC_REAP_RELEASE] =
{ .lock_tree = SA_XLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = true,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = 0,
.exec = reap_release, .copyout_on_error = false, },
[PROC_REAP_STATUS] =
{ .lock_tree = SA_SLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0,
.copyout_sz = sizeof(struct procctl_reaper_status),
.exec = reap_status, .copyout_on_error = false, },
[PROC_REAP_GETPIDS] =
{ .lock_tree = SA_SLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(struct procctl_reaper_pids),
.copyout_sz = 0,
.exec = reap_getpids, .copyout_on_error = false, },
[PROC_REAP_KILL] =
{ .lock_tree = SA_SLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(struct procctl_reaper_kill),
.copyout_sz = sizeof(struct procctl_reaper_kill),
.exec = reap_kill, .copyout_on_error = true, },
[PROC_TRACE_CTL] =
{ .lock_tree = SA_SLOCKED, .one_proc = false,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = trace_ctl, .copyout_on_error = false, },
[PROC_TRACE_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = trace_status, .copyout_on_error = false, },
[PROC_TRAPCAP_CTL] =
{ .lock_tree = SA_SLOCKED, .one_proc = false,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = trapcap_ctl, .copyout_on_error = false, },
[PROC_TRAPCAP_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = trapcap_status, .copyout_on_error = false, },
[PROC_PDEATHSIG_CTL] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = true, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = pdeathsig_ctl, .copyout_on_error = false, },
[PROC_PDEATHSIG_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = true, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = pdeathsig_status, .copyout_on_error = false, },
[PROC_ASLR_CTL] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = aslr_ctl, .copyout_on_error = false, },
[PROC_ASLR_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = aslr_status, .copyout_on_error = false, },
[PROC_PROTMAX_CTL] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = protmax_ctl, .copyout_on_error = false, },
[PROC_PROTMAX_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = protmax_status, .copyout_on_error = false, },
[PROC_STACKGAP_CTL] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = stackgap_ctl, .copyout_on_error = false, },
[PROC_STACKGAP_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = stackgap_status, .copyout_on_error = false, },
[PROC_NO_NEW_PRIVS_CTL] =
{ .lock_tree = SA_SLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = no_new_privs_ctl, .copyout_on_error = false, },
[PROC_NO_NEW_PRIVS_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = no_new_privs_status, .copyout_on_error = false, },
[PROC_WXMAP_CTL] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = sizeof(int), .copyout_sz = 0,
.exec = wxmap_ctl, .copyout_on_error = false, },
[PROC_WXMAP_STATUS] =
{ .lock_tree = SA_UNLOCKED, .one_proc = true,
.esrch_is_einval = false, .no_nonnull_data = false,
.need_candebug = false,
.copyin_sz = 0, .copyout_sz = sizeof(int),
.exec = wxmap_status, .copyout_on_error = false, },
};
@ -913,7 +936,8 @@ kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
EINVAL : ESRCH;
break;
}
error = p_cansee(td, p);
error = cmd_info->need_candebug ? p_candebug(td, p) :
p_cansee(td, p);
}
if (error == 0)
error = kern_procctl_single(td, p, com, data);
@ -936,7 +960,8 @@ kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
first_error = 0;
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) {
if (p->p_state == PRS_NEW || (cmd_info->need_candebug ?
p_candebug(td, p) : p_cansee(td, p)) != 0) {
PROC_UNLOCK(p);
continue;
}