fix out of bounds write for zero length buffer in gethostname

[musl] / src / unistd / fchown.c

diff --git a/src/unistd/fchown.c b/src/unistd/fchown.c
index 36633b0..75075ee 100644 (file)
--- a/src/unistd/fchown.c
+++ b/src/unistd/fchown.c
@@ -13,5 +13,10 @@ int fchown(int fd, uid_t uid, gid_t gid)
 
        char buf[15+3*sizeof(int)];
        __procfdname(buf, fd);
+#ifdef SYS_chown
        return syscall(SYS_chown, buf, uid, gid);
+#else
+       return syscall(SYS_fchownat, AT_FDCWD, buf, uid, gid, 0);
+#endif
+
 }