tools/tests/darwintests/voucher_entry_18826844.c

   1 /*
   2  * Test that sending a message to a voucher with the same voucher as the voucher port
   3  * with only one send right count with move send before the copy send doesn't panic.
   4  *
   5  * clang -o voucherentry voucherentry.c -ldarwintest -Weverything -Wno-gnu-flexible-array-initializer
   6  *
   7  * <rdar://problem/18826844>
   8  */
   9
  10 #include <mach/mach.h>
  11 #include <darwintest.h>
  12
  13 T_DECL(voucher_entry, "voucher_entry", T_META_CHECK_LEAKS(false), T_META_ALL_VALID_ARCHS(true))
  14 {
  15         kern_return_t kr        = KERN_SUCCESS;
  16         mach_voucher_t voucher  = MACH_VOUCHER_NULL;
  17
  18         /*
  19          * The bank voucher already exists in this process, so using it doesn't
  20          * actually test the problem. Use an importance voucher instead.
  21          */
  22         mach_voucher_attr_recipe_data_t recipe = {
  23                 .key                = MACH_VOUCHER_ATTR_KEY_IMPORTANCE,
  24                 .command            = MACH_VOUCHER_ATTR_IMPORTANCE_SELF,
  25                 .previous_voucher   = MACH_VOUCHER_NULL,
  26                 .content_size       = 0,
  27         };
  28
  29         kr = host_create_mach_voucher(mach_host_self(),
  30                                       (mach_voucher_attr_raw_recipe_array_t)&recipe,
  31                                       sizeof(recipe), &voucher);
  32
  33         T_ASSERT_MACH_SUCCESS(kr, "host_create_mach_voucher");
  34
  35         T_ASSERT_NOTNULL(voucher, "voucher must not be null");
  36
  37         mach_port_urefs_t refs = 0;
  38
  39         kr = mach_port_get_refs(mach_task_self(), voucher, MACH_PORT_RIGHT_SEND, &refs);
  40
  41         T_ASSERT_MACH_SUCCESS(kr, "mach_port_get_refs");
  42
  43         T_ASSERT_EQ(refs, (mach_port_urefs_t)1, "voucher must have only one ref");
  44
  45         /* First, try with two moves (must fail because there's only one ref) */
  46         mach_msg_header_t request_msg_1 = {
  47                 .msgh_remote_port   = voucher,
  48                 .msgh_local_port    = MACH_PORT_NULL,
  49                 .msgh_voucher_port  = voucher,
  50                 .msgh_bits          = MACH_MSGH_BITS_SET(MACH_MSG_TYPE_MOVE_SEND, 0, MACH_MSG_TYPE_MOVE_SEND, 0),
  51                 .msgh_id            = 0xDEAD,
  52                 .msgh_size          = sizeof(request_msg_1),
  53         };
  54
  55         kr = mach_msg_send(&request_msg_1);
  56
  57         T_ASSERT_MACH_ERROR(MACH_SEND_INVALID_DEST, kr, "send with two moves should fail with invalid dest");
  58
  59         /* Next, try with a move and a copy (will succeed and destroy the last ref) */
  60         mach_msg_header_t request_msg_2 = {
  61                 .msgh_remote_port   = voucher,
  62                 .msgh_local_port    = MACH_PORT_NULL,
  63                 .msgh_voucher_port  = voucher,
  64                 .msgh_bits          = MACH_MSGH_BITS_SET(MACH_MSG_TYPE_MOVE_SEND, 0, MACH_MSG_TYPE_COPY_SEND, 0),
  65                 .msgh_id            = 0xDEAD,
  66                 .msgh_size          = sizeof(request_msg_2),
  67         };
  68
  69         /* panic happens here */
  70         kr = mach_msg_send(&request_msg_2);
  71
  72         T_ASSERT_MACH_SUCCESS(kr, "send with move and copy succeeds");
  73
  74         kr = mach_port_get_refs(mach_task_self(), voucher, MACH_PORT_RIGHT_SEND, &refs);
  75
  76         T_ASSERT_MACH_ERROR(KERN_INVALID_NAME, kr, "voucher should now be invalid name");
  77 }
  78