read-cache.c: drop PROT_WRITE from mmap of index

diff --git a/read-cache.c b/read-cache.c
index 9cff715d6b669ecf05f861bc553b61d20d04191d..cc67dd1d5d3b5d6005ec968f9fcde6276016ef62 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -1525,7 +1525,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
        if (mmap_size < sizeof(struct cache_header) + 20)
                die("index file smaller than expected");
 
-       mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+       mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
        if (mmap == MAP_FAILED)
                die_errno("unable to map index file");
        close(fd);