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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2022-08-28 03:33:37 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2022-08-28 03:33:37 +0200 |
| commit | 30c93547cd14db1ae44ea9e32bf36a2c2b152c07 (patch) | |
| tree | 1e192300f34a022f43ebe48e904828afd6933ed1 /ipc | |
| parent | 286ae33f3b02045491e651326aaf544db3ace4ad (diff) | |
| download | gnumach-30c93547cd14db1ae44ea9e32bf36a2c2b152c07.tar.gz gnumach-30c93547cd14db1ae44ea9e32bf36a2c2b152c07.tar.bz2 gnumach-30c93547cd14db1ae44ea9e32bf36a2c2b152c07.zip | |
kmsg: factorize uint32_t into an alignment type
and restore the checks for offset alignment in the message, even if
currently it is trivially always alright.
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/ipc_kmsg.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/ipc/ipc_kmsg.c b/ipc/ipc_kmsg.c index cf7ec77d..8f54f81d 100644 --- a/ipc/ipc_kmsg.c +++ b/ipc/ipc_kmsg.c @@ -69,9 +69,11 @@ #endif /* msg body is always aligned to 4 bytes */ -#define msg_is_misaligned(x) ( ((vm_offset_t)(x)) & (sizeof(uint32_t)-1) ) +typedef uint32_t msg_align_t; + +#define msg_is_misaligned(x) ( ((vm_offset_t)(x)) & (sizeof(msg_align_t)-1) ) #define msg_align(x) \ - ( ( ((vm_offset_t)(x)) + (sizeof(uint32_t)-1) ) & ~(sizeof(uint32_t)-1) ) + ( ( ((vm_offset_t)(x)) + (sizeof(msg_align_t)-1) ) & ~(sizeof(msg_align_t)-1) ) ipc_kmsg_t ipc_kmsg_cache[NCPUS]; @@ -1377,6 +1379,9 @@ ipc_kmsg_copyin_body( } else { vm_offset_t addr; + if (sizeof(msg_align_t) > sizeof(mach_msg_type_t)) + saddr = msg_align(saddr); + if ((eaddr - saddr) < sizeof(vm_offset_t)) { ipc_kmsg_clean_partial(kmsg, taddr, FALSE, 0); return MACH_SEND_MSG_TOO_SMALL; @@ -2424,6 +2429,9 @@ ipc_kmsg_copyout_body( } else { vm_offset_t data; + if (sizeof(msg_align_t) > sizeof(mach_msg_type_t)) + saddr = msg_align(saddr); + data = * (vm_offset_t *) saddr; /* copyout memory carried in the message */ |