Attachment 1742 Details for Bug 1470 – openssh-linux-oom_kill.patch

openssh-linux-oom_kill.patch

openssh-linux-oom_kill.patch (text/plain), 4.71 KB, created by Darren Tucker on 2009-12-07 17:07:37 AEDT

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Creator: Darren Tucker

Created: 2009-12-07 17:07:37 AEDT

Size: 4.71 KB

patch

obsolete

>Index: configure.ac
>===================================================================
>RCS file: /var/cvs/openssh/configure.ac,v
>retrieving revision 1.431
>diff -u -p -r1.431 configure.ac
>--- configure.ac	7 Dec 2009 00:15:43 -0000	1.431
>+++ configure.ac	7 Dec 2009 06:06:10 -0000
>@@ -589,6 +589,7 @@ main() { if (NSVersionOfRunTimeLibrary("
> 		if it doesn't return EOPNOTSUPP.])
> 	AC_DEFINE(_PATH_BTMP, "/var/log/btmp", [log for bad login attempts])
> 	AC_DEFINE(USE_BTMP)
>+	AC_DEFINE(LINUX_OOM_ADJUST, 1, [Adjust Linux out-of-memory killer])
> 	inet6_default_4in6=yes
> 	case `uname -r` in
> 	1.*|2.0.*)
>Index: platform.c
>===================================================================
>RCS file: /var/cvs/openssh/platform.c,v
>retrieving revision 1.1
>diff -u -p -r1.1 platform.c
>--- platform.c	30 Aug 2006 17:24:41 -0000	1.1
>+++ platform.c	7 Dec 2009 06:06:10 -0000
>@@ -22,6 +22,15 @@
> #include "openbsd-compat/openbsd-compat.h"
> 
> void
>+platform_pre_listen(void)
>+{
>+#ifdef LINUX_OOM_ADJUST
>+	/* Adjust out-of-memory killer so listening process is not killed */
>+	oom_adjust_setup();
>+#endif
>+}
>+
>+void
> platform_pre_fork(void)
> {
> #ifdef USE_SOLARIS_PROCESS_CONTRACTS
>@@ -42,5 +51,8 @@ platform_post_fork_child(void)
> {
> #ifdef USE_SOLARIS_PROCESS_CONTRACTS
> 	solaris_contract_post_fork_child();
>+#endif
>+#ifdef LINUX_OOM_ADJUST
>+	oom_adjust_restore();
> #endif
> }
>Index: platform.h
>===================================================================
>RCS file: /var/cvs/openssh/platform.h,v
>retrieving revision 1.1
>diff -u -p -r1.1 platform.h
>--- platform.h	30 Aug 2006 17:24:41 -0000	1.1
>+++ platform.h	7 Dec 2009 06:06:10 -0000
>@@ -18,6 +18,7 @@
> 
> #include <sys/types.h>
> 
>+void platform_pre_listen(void);
> void platform_pre_fork(void);
> void platform_post_fork_parent(pid_t child_pid);
> void platform_post_fork_child(void);
>Index: sshd.c
>===================================================================
>RCS file: /var/cvs/openssh/sshd.c,v
>retrieving revision 1.387
>diff -u -p -r1.387 sshd.c
>--- sshd.c	18 Nov 2009 06:48:30 -0000	1.387
>+++ sshd.c	7 Dec 2009 06:06:11 -0000
>@@ -1656,6 +1656,7 @@ main(int ac, char **av)
> 	if (inetd_flag) {
> 		server_accept_inetd(&sock_in, &sock_out);
> 	} else {
>+		platform_pre_listen();
> 		server_listen();
> 
> 		if (options.protocol & SSH_PROTO_1)
>Index: openbsd-compat/port-linux.c
>===================================================================
>RCS file: /var/cvs/openssh/openbsd-compat/port-linux.c,v
>retrieving revision 1.6
>diff -u -p -r1.6 port-linux.c
>--- openbsd-compat/port-linux.c	24 Oct 2009 04:04:13 -0000	1.6
>+++ openbsd-compat/port-linux.c	7 Dec 2009 06:06:11 -0000
>@@ -27,8 +27,15 @@
> #include <stdarg.h>
> #include <string.h>
> 
>-#ifdef WITH_SELINUX
>+#if defined(LINUX_OOM_ADJUST) || defined(WITH_SELINUX)
> #include "log.h"
>+#endif
>+
>+#ifdef LINUX_OOM_ADJUST
>+#include <stdio.h>
>+#endif
>+
>+#ifdef WITH_SELINUX
> #include "xmalloc.h"
> #include "port-linux.h"
> 
>@@ -204,3 +211,55 @@ ssh_selinux_change_context(const char *n
> 	xfree(newctx);
> }
> #endif /* WITH_SELINUX */
>+
>+#ifdef LINUX_OOM_ADJUST
>+#define OOM_ADJ_PATH	"/proc/self/oom_adj"
>+#define OOM_ADJ_NOKILL	-17  /* magic value to disable OOM killer */
>+
>+static int oom_adj_save = INT_MIN;
>+
>+/*
>+ * Tell the kernel's out-of-memory killer to avoid sshd.
>+ * Returns the previous oom_adj value or zero.
>+ */
>+void
>+oom_adjust_setup(void)
>+{
>+	FILE *fp;
>+
>+	debug3("%s", __func__);
>+	if ((fp = fopen(OOM_ADJ_PATH, "r+")) != NULL) {
>+		if (fscanf(fp, "%d", &oom_adj_save) != 1)
>+			logit("error reading %s: %s", OOM_ADJ_PATH, strerror(errno));
>+		else {
>+			rewind(fp);
>+			if (fprintf(fp, "%d\n", OOM_ADJ_NOKILL) <= 0)
>+				logit("error writing %s: %s",
>+				    OOM_ADJ_PATH, strerror(errno));
>+			else
>+				verbose("Set %s from %d to %d",
>+				    OOM_ADJ_PATH, oom_adj_save, OOM_ADJ_NOKILL);
>+		}
>+		fclose(fp);
>+	}
>+}
>+
>+/* Restore the saved OOM adjustment */
>+void
>+oom_adjust_restore(void)
>+{
>+	FILE *fp;
>+
>+	debug3("%s", __func__);
>+	if (oom_adj_save == INT_MIN || (fp = fopen(OOM_ADJ_PATH, "w")) == NULL)
>+		return;
>+
>+	if (fprintf(fp, "%d\n", oom_adj_save) <= 0)
>+		logit("error writing %s: %s", OOM_ADJ_PATH, strerror(errno));
>+	else
>+		verbose("Set %s to %d", OOM_ADJ_PATH, oom_adj_save);
>+
>+	fclose(fp);
>+	return;
>+}
>+#endif
>Index: openbsd-compat/port-linux.h
>===================================================================
>RCS file: /var/cvs/openssh/openbsd-compat/port-linux.h,v
>retrieving revision 1.3
>diff -u -p -r1.3 port-linux.h
>--- openbsd-compat/port-linux.h	24 Oct 2009 04:04:13 -0000	1.3
>+++ openbsd-compat/port-linux.h	7 Dec 2009 06:06:11 -0000
>@@ -26,4 +26,9 @@ void ssh_selinux_setup_exec_context(char
> void ssh_selinux_change_context(const char *);
> #endif
> 
>+#ifdef LINUX_OOM_ADJUST
>+void oom_adjust_restore(void);
>+void oom_adjust_setup(void);
>+#endif
>+
> #endif /* ! _PORT_LINUX_H */

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