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| author | Flavio Cruz <flaviocruz@gmail.com> | 2023-05-04 00:08:12 -0400 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-05-05 02:24:38 +0200 |
| commit | 4571fb8fe64644c79d91a8f76c148a05b7088ea8 (patch) | |
| tree | 64aba6c13a443bdbe62f8f1f3ea0ef57b93335d4 /hurd/intr-msg.c | |
| parent | 3f433cb895dee51dee57cb487bc33b1425fa7ef6 (diff) | |
| download | glibc-4571fb8fe64644c79d91a8f76c148a05b7088ea8.zip glibc-4571fb8fe64644c79d91a8f76c148a05b7088ea8.tar.gz glibc-4571fb8fe64644c79d91a8f76c148a05b7088ea8.tar.bz2 | |
Update hurd/intr-msg.c to be more portable
Summary of the changes:
- Introduce BAD_TYPECHECK from MiG to make it simpler to do type
checking.
- Replace int type with mach_msg_type_t. This assumes that
mach_msg_type_t is always the same size as int which is not true for
x86_64.
- Calculate the size and align using PTR_ALIGN_UP, which is a bit
cleaner and similar to what we do elsewhere.
- Define mach_msg_type_t to check using designated initializers.
Message-Id: <ZFMvrIkvoCSxqB/C@jupiter.tail36e24.ts.net>
Diffstat (limited to 'hurd/intr-msg.c')
| -rw-r--r-- | hurd/intr-msg.c | 34 |
1 files changed, 21 insertions, 13 deletions
diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c index 716d87a..b535397 100644 --- a/hurd/intr-msg.c +++ b/hurd/intr-msg.c @@ -28,6 +28,11 @@ # define mig_reply_header_t mig_reply_error_t #endif +/* Macro used by MIG to cleanly check the type. */ +#define BAD_TYPECHECK(type, check) __glibc_unlikely (({ \ + union { mach_msg_type_t t; uint32_t w; } _t, _c; \ + _t.t = *(type); _c.t = *(check);_t.w != _c.w; })) + error_t _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg, mach_msg_option_t option, @@ -61,7 +66,7 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg, #ifdef NDR_CHAR_ASCII NDR_record_t ndr; #else - int type; + mach_msg_type_t type; #endif int code; } check; @@ -222,11 +227,12 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg, if (ty->msgtl_header.msgt_inline) { + /* Calculate length of data in bytes. */ + const vm_size_t length = ((number * size) + 7) >> 3; clean_ports ((void *) ty, 0); - /* calculate length of data in bytes, rounding up */ - ty = (void *) ty + (((((number * size) + 7) >> 3) - + sizeof (mach_msg_type_t) - 1) - &~ (sizeof (mach_msg_type_t) - 1)); + /* Move to the next argument. */ + ty = (void *) PTR_ALIGN_UP ((char *) ty + length, + __alignof__ (uintptr_t)); } else { @@ -354,19 +360,21 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg, { /* We got a reply. Was it EINTR? */ #ifdef MACH_MSG_TYPE_BIT - const union - { - mach_msg_type_t t; - int i; - } check = - { t: { MACH_MSG_TYPE_INTEGER_T, sizeof (integer_t) * 8, - 1, TRUE, FALSE, FALSE, 0 } }; + static const mach_msg_type_t type_check = { + .msgt_name = MACH_MSG_TYPE_INTEGER_T, + .msgt_size = sizeof (integer_t) * 8, + .msgt_number = 1, + .msgt_inline = TRUE, + .msgt_longform = FALSE, + .msgt_deallocate = FALSE, + .msgt_unused = 0 + }; #endif if (m->reply.RetCode == EINTR && m->header.msgh_size == sizeof m->reply #ifdef MACH_MSG_TYPE_BIT - && m->check.type == check.i + && !BAD_TYPECHECK(&m->check.type, &type_check) #endif && !(m->header.msgh_bits & MACH_MSGH_BITS_COMPLEX)) { |