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procctl(8): usermode bits to force LA58/LA57 on exec.

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Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D25273
This commit is contained in:
Konstantin Belousov 2020-08-23 20:44:15 +00:00
parent f446480b5f
commit da477bcdc0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=364535
2 changed files with 58 additions and 1 deletions
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3
usr.bin/proccontrol/proccontrol.1
View File

@ -71,6 +71,9 @@ Controls the implicit PROT_MAX application for
.Xr mmap 2 .
.It Ar kpti
Controls the KPTI enable, AMD64 only.
.It Ar la48
Control limiting usermode process address space to 48 bits of address,
AMD64 only, on machines capable of 57-bit addressing.
.El
.Pp
The

56
usr.bin/proccontrol/proccontrol.c
View File

@ -48,6 +48,10 @@ enum {
#ifdef PROC_KPTI_CTL
MODE_KPTI,
#endif
#ifdef PROC_LA_CTL
MODE_LA57,
MODE_LA48,
#endif
};
static pid_t
@ -69,13 +73,18 @@ str2pid(const char *str)
#else
#define KPTI_USAGE
#endif
#ifdef PROC_LA_CTL
#define LA_USAGE "|la48|la57"
#else
#define LA_USAGE
#endif
static void __dead2
usage(void)
{
fprintf(stderr, "Usage: proccontrol -m (aslr|protmax|trace|trapcap|"
"stackgap"KPTI_USAGE") [-q] "
"stackgap"KPTI_USAGE LA_USAGE") [-q] "
"[-s (enable|disable)] [-p pid | command]\n");
exit(1);
}
@ -107,6 +116,12 @@ main(int argc, char *argv[])
#ifdef PROC_KPTI_CTL
else if (strcmp(optarg, "kpti") == 0)
mode = MODE_KPTI;
#endif
#ifdef PROC_LA_CTL
else if (strcmp(optarg, "la57") == 0)
mode = MODE_LA57;
else if (strcmp(optarg, "la48") == 0)
mode = MODE_LA48;
#endif
else
usage();
@ -163,6 +178,12 @@ main(int argc, char *argv[])
case MODE_KPTI:
error = procctl(P_PID, pid, PROC_KPTI_STATUS, &arg);
break;
#endif
#ifdef PROC_LA_CTL
case MODE_LA57:
case MODE_LA48:
error = procctl(P_PID, pid, PROC_LA_STATUS, &arg);
break;
#endif
default:
usage();
@ -258,6 +279,27 @@ main(int argc, char *argv[])
else
printf(", not active\n");
break;
#endif
#ifdef PROC_LA_CTL
case MODE_LA57:
case MODE_LA48:
switch (arg & ~(PROC_LA_STATUS_LA48 |
PROC_LA_STATUS_LA57)) {
case PROC_LA_CTL_LA48_ON_EXEC:
printf("la48 on exec");
break;
case PROC_LA_CTL_LA57_ON_EXEC:
printf("la57 on exec");
break;
case PROC_LA_CTL_DEFAULT_ON_EXEC:
printf("default on exec");
break;
}
if ((arg & PROC_LA_STATUS_LA48) != 0)
printf(", la48 active\n");
else if ((arg & PROC_LA_STATUS_LA57) != 0)
printf(", la57 active\n");
break;
#endif
}
} else {
@ -294,6 +336,18 @@ main(int argc, char *argv[])
PROC_KPTI_CTL_DISABLE_ON_EXEC;
error = procctl(P_PID, pid, PROC_KPTI_CTL, &arg);
break;
#endif
#ifdef PROC_LA_CTL
case MODE_LA57:
arg = enable ? PROC_LA_CTL_LA57_ON_EXEC :
PROC_LA_CTL_DEFAULT_ON_EXEC;
error = procctl(P_PID, pid, PROC_LA_CTL, &arg);
break;
case MODE_LA48:
arg = enable ? PROC_LA_CTL_LA48_ON_EXEC :
PROC_LA_CTL_DEFAULT_ON_EXEC;
error = procctl(P_PID, pid, PROC_LA_CTL, &arg);
break;
#endif
default:
usage();