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9723 provide support for VMM's GDT handling
Reviewed by: Robert Mustacchi <rm@joyent.com> Reviewed by: Patrick Mooney <patrick.mooney@joyent.com> Reviewed by: Yuri Pankov <yuripv@yuripv.net> Approved by: Dan McDonald <danmcd@joyent.com>
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John Levon
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Dan McDonald
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Aug 13, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* | ||
| * This file and its contents are supplied under the terms of the | ||
| * Common Development and Distribution License ("CDDL"), version 1.0. | ||
| * You may only use this file in accordance with the terms of version | ||
| * 1.0 of the CDDL. | ||
| * | ||
| * A full copy of the text of the CDDL should have accompanied this | ||
| * source. A copy of the CDDL is also available via the Internet at | ||
| * http://www.illumos.org/license/CDDL. | ||
| */ | ||
|
|
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| /* | ||
| * Copyright 2018 Joyent, Inc. | ||
| */ | ||
|
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| #include <stdlib.h> | ||
| #include <ucontext.h> | ||
| #include <sys/wait.h> | ||
| #include <unistd.h> | ||
| #include <sys/regset.h> | ||
|
|
||
| /* | ||
| * Load a bunch of bad selectors into the seg regs: this will typically cause | ||
| * the child process to core dump, but it shouldn't panic the kernel... | ||
| * | ||
| * It's especially interesting to run this on CPU0. | ||
| */ | ||
|
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| unsigned short selector; | ||
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| static void badds(void) | ||
| { | ||
| __asm__ volatile("movw %0, %%ds" : : "r" (selector)); | ||
| } | ||
|
|
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| static void bades(void) | ||
| { | ||
| __asm__ volatile("movw %0, %%es" : : "r" (selector)); | ||
| } | ||
|
|
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| static void badfs(void) | ||
| { | ||
| __asm__ volatile("movw %0, %%fs" : : "r" (selector)); | ||
| } | ||
|
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| static void badgs(void) | ||
| { | ||
| __asm__ volatile("movw %0, %%gs" : : "r" (selector)); | ||
| } | ||
|
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| static void badss(void) | ||
| { | ||
| __asm__ volatile("movw %0, %%ss" : : "r" (selector)); | ||
| } | ||
|
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| static void | ||
| resetseg(uint_t seg) | ||
| { | ||
| ucontext_t ucp; | ||
| int done = 0; | ||
|
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| int rc = getcontext(&ucp); | ||
| if (done) { | ||
| rc = getcontext(&ucp); | ||
| return; | ||
| } | ||
|
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| done = 1; | ||
| ucp.uc_mcontext.gregs[seg] = selector; | ||
| setcontext(&ucp); | ||
| abort(); | ||
| } | ||
|
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| static void | ||
| resetcs(void) | ||
| { | ||
| return (resetseg(CS)); | ||
| } | ||
|
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| static void | ||
| resetds(void) | ||
| { | ||
| return (resetseg(DS)); | ||
| } | ||
|
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| static void | ||
| resetes(void) | ||
| { | ||
| return (resetseg(ES)); | ||
| } | ||
|
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| static void | ||
| resetfs(void) | ||
| { | ||
| return (resetseg(FS)); | ||
| } | ||
|
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| static void | ||
| resetgs(void) | ||
| { | ||
| return (resetseg(GS)); | ||
| } | ||
|
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| static void | ||
| resetss(void) | ||
| { | ||
| return (resetseg(SS)); | ||
| } | ||
|
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| static void | ||
| inchild(void (*func)()) | ||
| { | ||
| pid_t pid; | ||
|
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| switch ((pid = fork())) { | ||
| case 0: | ||
| func(); | ||
| exit(0); | ||
| case -1: | ||
| exit(1); | ||
| default: | ||
| (void) waitpid(pid, NULL, 0); | ||
| return; | ||
| } | ||
|
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| } | ||
|
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| int | ||
| main(int argc, char *argv[]) | ||
| { | ||
| for (selector = 0; selector < 8194; selector++) { | ||
| inchild(resetcs); | ||
| inchild(resetds); | ||
| inchild(resetes); | ||
| inchild(resetfs); | ||
| inchild(resetgs); | ||
| inchild(resetss); | ||
| inchild(badds); | ||
| inchild(bades); | ||
| inchild(badfs); | ||
| inchild(badgs); | ||
| inchild(badss); | ||
| } | ||
|
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| exit(0); | ||
| } |
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