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init: Open /etc/motd with O_CLOEXEC to avoid leaking this file to children

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This commit is contained in:
apio 2022-10-28 17:13:45 +02:00
parent c312d81de4
commit 77d331b258
1 changed files with 9 additions and 2 deletions
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11
apps/src/init.c
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@ -1,4 +1,5 @@
#include <errno.h> #include <errno.h>
#include <fcntl.h>
#include <luna.h> #include <luna.h>
#include <stdio.h> #include <stdio.h>
#include <sys/wait.h> #include <sys/wait.h>
@ -6,10 +7,16 @@
void show_motd() void show_motd()
{ {
FILE* fp = fopen("/etc/motd", "r"); int fd = open("/etc/motd", O_RDONLY | O_CLOEXEC);
if (fd < 0)
{
if (errno != ENOENT) { perror("open"); }
return;
}
FILE* fp = fdopen(fd, "r");
if (!fp) if (!fp)
{ {
if (errno != ENOENT) { perror("fopen"); } perror("fopen");
return; return;
} }