This makes silly practical jokes impossible, like for example symlinking
/dev/null or dev/random to /etc/nologin.txt
Signed-off-by: Sami Kerola <kerolasa@xxxxxx>
---
login-utils/nologin.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/login-utils/nologin.c b/login-utils/nologin.c
index 3be50ca..0a06ef8 100644
--- a/login-utils/nologin.c
+++ b/login-utils/nologin.c
@@ -3,6 +3,7 @@
*/
#include <stdio.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
@@ -38,6 +39,7 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
int main(int argc, char *argv[])
{
int c, fd;
+ struct stat st;
static const struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
@@ -63,7 +65,8 @@ int main(int argc, char *argv[])
}
fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
- if (fd >= 0) {
+ c = fstat(fd, &st);
+ if (fd >= 0 && !c && S_ISREG(st.st_mode)) {
char buf[BUFSIZ];
ssize_t rd;
--
2.6.1
--
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