If the user tries to set kern.randompid to 1 (which is meaningless), set
it to a random value between 100 and 1123, rather than 0 as before. Submitted by: Marie Helene Kvello-Aune <marieheleneka@gmail.com> MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D5336
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=323390
@ -208,20 +208,26 @@ sysctl_kern_randompid(SYSCTL_HANDLER_ARGS)
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pid = randompid;
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error = sysctl_handle_int(oidp, &pid, 0, req);
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if (error == 0 && req->newptr != NULL) {
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if (pid < 0 || pid > pid_max - 100) /* out of range */
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pid = pid_max - 100;
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else if (pid < 2) /* NOP */
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pid = 0;
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else if (pid < 100) /* Make it reasonable */
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pid = 100;
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randompid = pid;
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if (pid == 0)
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randompid = 0;
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else if (pid == 1)
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/* generate a random PID modulus between 100 and 1123 */
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randompid = 100 + arc4random() % 1024;
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else if (pid < 0 || pid > pid_max - 100)
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/* out of range */
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randompid = pid_max - 100;
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else if (pid < 100)
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/* Make it reasonable */
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randompid = 100;
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else
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randompid = pid;
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}
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sx_xunlock(&allproc_lock);
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, randompid, CTLTYPE_INT|CTLFLAG_RW,
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0, 0, sysctl_kern_randompid, "I", "Random PID modulus");
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0, 0, sysctl_kern_randompid, "I", "Random PID modulus. Special values: 0: disable, 1: choose random value");
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static int
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fork_findpid(int flags)
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