From 0edbd2e0164a8c6cbad415e38083469041f29996 Mon Sep 17 00:00:00 2001 From: David Phillips Date: Fri, 19 Jun 2015 23:42:15 +1200 Subject: [PATCH] Slightly safer OOM killer disablement in linux --- slock.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/slock.c b/slock.c index d6053af..b3bee92 100644 --- a/slock.c +++ b/slock.c @@ -60,16 +60,27 @@ die(const char *errstr, ...) #ifdef __linux__ #include +#include static void dontkillme(void) { int fd; + int length; + char value[64]; fd = open("/proc/self/oom_score_adj", O_WRONLY); if (fd < 0 && errno == ENOENT) return; - if (fd < 0 || write(fd, "-1000\n", 6) != 6 || close(fd) != 0) + + /* convert OOM_SCORE_ADJ_MIN to string for writing */ + length = snprintf(value, sizeof(value), "%d\n", OOM_SCORE_ADJ_MIN); + + /* bail on truncation */ + if (length >= sizeof(value)) + die("buffer too small\n"); + + if (fd < 0 || write(fd, value, length) != length || close(fd) != 0) die("cannot disable the out-of-memory killer for this process\n"); } #endif -- 2.20.1