diff options
| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-05-23 18:23:45 +0200 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-05-23 18:23:45 +0200 |
| commit | 96ade86f9f410cee6377f60530bcc3aa89b20402 (patch) | |
| tree | bc41452e63602449af74218cf42b89232430a382 /kern | |
| parent | 417ca3833d651a89dc55462739f9dbb9f7af7866 (diff) | |
kern: avoid breaking the strict-aliasing rules
* kern/exception.c (exception_parse_reply): Use `BAD_TYPECHECK'.
Diffstat (limited to 'kern')
| -rw-r--r-- | kern/exception.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kern/exception.c b/kern/exception.c index 6e84c0a..6cb3bfb 100644 --- a/kern/exception.c +++ b/kern/exception.c @@ -48,6 +48,7 @@ #include <kern/sched.h> #include <kern/sched_prim.h> #include <kern/exception.h> +#include <kern/macros.h> #include <mach/machine/vm_types.h> #if MACH_KDB @@ -754,6 +755,12 @@ exception_raise( } } +/* Macro used by MIG to cleanly check the type. */ +#define BAD_TYPECHECK(type, check) unlikely (({\ + union { mach_msg_type_t t; unsigned32_t w; } _t, _c;\ + _t.t = *(type); _c.t = *(check);_t.w != _c.w; })) + +/* Type descriptor for the return code. */ mach_msg_type_t exc_RetCode_proto = { /* msgt_name = */ MACH_MSG_TYPE_INTEGER_32, /* msgt_size = */ 32, @@ -786,7 +793,7 @@ exception_parse_reply(ipc_kmsg_t kmsg) MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND_ONCE, 0)) || (msg->Head.msgh_size != sizeof *msg) || (msg->Head.msgh_id != MACH_EXCEPTION_REPLY_ID) || - (* (int *) &msg->RetCodeType != * (int *) &exc_RetCode_proto)) { + (BAD_TYPECHECK(&msg->RetCodeType, &exc_RetCode_proto))) { /* * Bozo user sent us a misformatted reply. */ |