diff options
| -rw-r--r-- | misc-utils/write.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/misc-utils/write.c b/misc-utils/write.c index 46b8f0acf..276fe96d4 100644 --- a/misc-utils/write.c +++ b/misc-utils/write.c @@ -72,6 +72,8 @@ static void done(int); int term_chk(char *, int *, time_t *, int); int utmp_chk(char *, char *); +static gid_t myegid; + int main(int argc, char **argv) { time_t atime; @@ -83,6 +85,8 @@ main(int argc, char **argv) { bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); + myegid = getegid(); + /* check that sender has write enabled */ if (isatty(fileno(stdin))) myttyfd = fileno(stdin); @@ -267,7 +271,9 @@ int term_chk(char *tty, int *msgsokP, time_t *atimeP, int showerror) "write: %s: %s\n", path, strerror(errno)); return(1); } - *msgsokP = (s.st_mode & (S_IWRITE >> 3)) != 0; /* group write bit */ + + /* group write bit and group ownership */ + *msgsokP = (s.st_mode & (S_IWRITE >> 3)) && myegid == s.st_gid; *atimeP = s.st_atime; return(0); } |