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| author | Sami Kerola | 2015-10-07 00:15:54 +0200 |
|---|---|---|
| committer | Sami Kerola | 2015-10-18 19:03:38 +0200 |
| commit | bd299782ca40756515acf1c3afa4d8662a2492f2 (patch) | |
| tree | 5231de4d41e0665827f5f0ecd625feeaeb142b30 | |
| parent | last: display input file in usage() according to command name (diff) | |
| download | kernel-qcow2-util-linux-bd299782ca40756515acf1c3afa4d8662a2492f2.tar.gz kernel-qcow2-util-linux-bd299782ca40756515acf1c3afa4d8662a2492f2.tar.xz kernel-qcow2-util-linux-bd299782ca40756515acf1c3afa4d8662a2492f2.zip | |
nologin: require /etc/nologin.txt to be file
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@iki.fi>
| -rw-r--r-- | login-utils/nologin.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/login-utils/nologin.c b/login-utils/nologin.c index 3be50ca12..0a06ef8b6 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; |