Date: Sun, 19 Feb 2012 10:38:56 +0000 (UTC) From: Mikolaj Golub <trociny@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r231912 - head/usr.sbin/daemon Message-ID: <201202191038.q1JAcuHd076444@svn.freebsd.org>
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Author: trociny Date: Sun Feb 19 10:38:55 2012 New Revision: 231912 URL: http://svn.freebsd.org/changeset/base/231912 Log: If permitted protect the supervisor against pageout kill. Suggested by: Andrey Zonov <andrey zonov org> MFC after: 2 weeks Modified: head/usr.sbin/daemon/daemon.c Modified: head/usr.sbin/daemon/daemon.c ============================================================================== --- head/usr.sbin/daemon/daemon.c Sun Feb 19 10:36:29 2012 (r231911) +++ head/usr.sbin/daemon/daemon.c Sun Feb 19 10:38:55 2012 (r231912) @@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> +#include <sys/mman.h> #include <sys/wait.h> #include <err.h> @@ -138,6 +139,12 @@ main(int argc, char *argv[]) sigaddset(&mask, SIGCHLD); if (sigprocmask(SIG_SETMASK, &mask, &oldmask) == -1) err(1, "sigprocmask"); + /* + * Try to protect against pageout kill. Ignore the + * error, madvise(2) will fail only if a process does + * not have superuser privileges. + */ + (void)madvise(NULL, 0, MADV_PROTECT); restart: /* * Spawn a child to exec the command, so in the parent
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