minix/lib/libpuffs/protect.c

   1 /* Created (MFS based):
   2  *   June 2011 (Evgeniy Ivanov)
   3  */
   4
   5 #include "fs.h"
   6
   7 #include "puffs.h"
   8 #include "puffs_priv.h"
   9
  10
  11 /*===========================================================================*
  12  *                              fs_chmod                                     *
  13  *===========================================================================*/
  14 int fs_chmod(ino_t ino_nr, mode_t *mode)
  15 {
  16 /* Perform the chmod(name, mode) system call. */
  17   struct puffs_node *pn;
  18   struct vattr va;
  19   PUFFS_MAKECRED(pcr, &global_kcred);
  20
  21   if (global_pu->pu_ops.puffs_node_setattr == NULL)
  22         return(EINVAL);
  23
  24   if ((pn = puffs_pn_nodewalk(global_pu, find_inode_cb, &ino_nr)) == NULL)
  25         return(EINVAL);
  26
  27   puffs_vattr_null(&va);
  28   /* Clear setgid bit if file is not in caller's grp */
  29   va.va_mode = (pn->pn_va.va_mode & ~ALL_MODES) | (*mode & ALL_MODES);
  30   (void)clock_time(&va.va_ctime);
  31
  32   if (global_pu->pu_ops.puffs_node_setattr(global_pu, pn, &va, pcr) != 0)
  33         return(EINVAL);
  34
  35   /* Return full new mode to caller. */
  36   *mode = pn->pn_va.va_mode;
  37
  38   return(OK);
  39 }
  40
  41
  42 /*===========================================================================*
  43  *                              fs_chown                                     *
  44  *===========================================================================*/
  45 int fs_chown(ino_t ino_nr, uid_t uid, gid_t gid, mode_t *mode)
  46 {
  47   struct puffs_node *pn;
  48   struct vattr va;
  49   PUFFS_MAKECRED(pcr, &global_kcred);
  50
  51   if ((pn = puffs_pn_nodewalk(global_pu, find_inode_cb, &ino_nr)) == NULL)
  52         return(EINVAL);
  53
  54   puffs_vattr_null(&va);
  55   va.va_uid = uid;
  56   va.va_gid = gid;
  57   va.va_mode = pn->pn_va.va_mode & ~(I_SET_UID_BIT | I_SET_GID_BIT);
  58   (void)clock_time(&va.va_ctime);
  59
  60   if (global_pu->pu_ops.puffs_node_setattr(global_pu, pn, &va, pcr) != 0)
  61         return(EINVAL);
  62
  63   /* Update caller on current mode, as it may have changed. */
  64   *mode = pn->pn_va.va_mode;
  65
  66   return(OK);
  67 }