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proccontrol(1): Add kpti control mode.

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Requested by:	jhb
Reviewed by:	jhb, markj (previous version)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D19514
This commit is contained in:
Konstantin Belousov 2019-03-16 11:46:48 +00:00
parent fd8d844f76
commit bab3f1d04a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345229
1 changed files with 43 additions and 1 deletions
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44
usr.bin/proccontrol/proccontrol.c
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@ -43,6 +43,9 @@ enum {
MODE_INVALID,
MODE_TRACE,
MODE_TRAPCAP,
#ifdef PROC_KPTI_CTL
MODE_KPTI,
#endif
};
static pid_t
@ -59,11 +62,18 @@ str2pid(const char *str)
return (res);
}
#ifdef PROC_KPTI_CTL
#define KPTI_USAGE "|kpti"
#else
#define KPTI_USAGE
#endif
static void __dead2
usage(void)
{
fprintf(stderr, "Usage: proccontrol -m (aslr|trace|trapcap) [-q] "
fprintf(stderr, "Usage: proccontrol -m (aslr|trace|trapcap"
KPTI_USAGE") [-q] "
"[-s (enable|disable)] [-p pid | command]\n");
exit(1);
}
@ -88,6 +98,10 @@ main(int argc, char *argv[])
mode = MODE_TRACE;
else if (strcmp(optarg, "trapcap") == 0)
mode = MODE_TRAPCAP;
#ifdef PROC_KPTI_CTL
else if (strcmp(optarg, "kpti") == 0)
mode = MODE_KPTI;
#endif
else
usage();
break;
@ -133,6 +147,11 @@ main(int argc, char *argv[])
case MODE_TRAPCAP:
error = procctl(P_PID, pid, PROC_TRAPCAP_STATUS, &arg);
break;
#ifdef PROC_KPTI_CTL
case MODE_KPTI:
error = procctl(P_PID, pid, PROC_KPTI_STATUS, &arg);
break;
#endif
default:
usage();
break;
@ -175,6 +194,22 @@ main(int argc, char *argv[])
break;
}
break;
#ifdef PROC_KPTI_CTL
case MODE_KPTI:
switch (arg & ~PROC_KPTI_STATUS_ACTIVE) {
case PROC_KPTI_CTL_ENABLE_ON_EXEC:
printf("enabled");
break;
case PROC_KPTI_CTL_DISABLE_ON_EXEC:
printf("disabled");
break;
}
if ((arg & PROC_KPTI_STATUS_ACTIVE) != 0)
printf(", active\n");
else
printf(", not active\n");
break;
#endif
}
} else {
switch (mode) {
@ -193,6 +228,13 @@ main(int argc, char *argv[])
PROC_TRAPCAP_CTL_DISABLE;
error = procctl(P_PID, pid, PROC_TRAPCAP_CTL, &arg);
break;
#ifdef PROC_KPTI_CTL
case MODE_KPTI:
arg = enable ? PROC_KPTI_CTL_ENABLE_ON_EXEC :
PROC_KPTI_CTL_DISABLE_ON_EXEC;
error = procctl(P_PID, pid, PROC_KPTI_CTL, &arg);
break;
#endif
default:
usage();
break;