don't trust filesystem we're calling out to

This change guarantees the vfs stat buffer is initialized. In the event that the fs we're calling in to is lying (says it wrote into buf, but really didn't) uninitialized vfs stack data would get send to the vfs caller.
2019-10-11 22:13:58 +02:00 · 2019-10-11 22:13:58 +02:00 · d51e668f60
commit d51e668f60
parent f7973340e6
1 changed files with 1 additions and 0 deletions
--- a/minix/servers/vfs/request.c
+++ b/minix/servers/vfs/request.c
@ -239,6 +239,7 @@ int req_statvfs(endpoint_t fs_e, struct statvfs *buf)
  cp_grant_id_t grant_id;
  message m;

+  memset(buf, 0x00, sizeof(struct statvfs));
  grant_id = cpf_grant_direct(fs_e, (vir_bytes) buf, sizeof(struct statvfs),
 			CPF_WRITE);
  if(grant_id == GRANT_INVALID)