From: Karel Zak <kzak@redhat.com>
Date: Thu, 20 Jun 2024 10:07:12 +0000 (+0200)
Subject: swapoff: avoid being killed by OOM
X-Git-Tag: v2.42-start~291^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e15d24dc9eb7004227c895e09a2e60945a708147;p=thirdparty%2Futil-linux.git

swapoff: avoid being killed by OOM

Based on patch from dparalen <vetrisko@gmail.com>.

Fixes: https://github.com/util-linux/util-linux/issues/3095
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/include/pathnames.h b/include/pathnames.h
index 81fa405f6..36d8acaea 100644
--- a/include/pathnames.h
+++ b/include/pathnames.h
@@ -110,6 +110,8 @@
 #define _PATH_PROC_FDDIR	"/proc/self/fd"
 #define _PATH_PROC_TIMENS_OFF   "/proc/self/timens_offsets"
 
+#define _PATH_PROC_OOM_ADJ	"/proc/self/oom_score_adj"
+
 #define _PATH_PROC_ATTR_CURRENT	"/proc/self/attr/current"
 #define _PATH_PROC_ATTR_EXEC	"/proc/self/attr/exec"
 #define _PATH_PROC_CAPLASTCAP	"/proc/sys/kernel/cap_last_cap"
diff --git a/sys-utils/swapoff.c b/sys-utils/swapoff.c
index 62f1374d0..5677d87a1 100644
--- a/sys-utils/swapoff.c
+++ b/sys-utils/swapoff.c
@@ -23,6 +23,8 @@
 #include "c.h"
 #include "xalloc.h"
 #include "closestream.h"
+#include "pathnames.h"
+#include "path.h"
 
 #include "swapprober.h"
 #include "swapon-common.h"
@@ -272,6 +274,9 @@ int main(int argc, char *argv[])
 		errtryhelp(SWAPOFF_EX_USAGE);
 	}
 
+	/* prevent the OOM killer from killing myself */
+	ul_path_write_string(NULL, "-1000", _PATH_PROC_OOM_ADJ);
+
 	mnt_init_debug(0);
 	mntcache = mnt_new_cache();