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[msan] Fix syscall handlers for pipe, pipe2, socketpair. 

These syscalls write two file descriptors into the output buffer, not one.

llvm-svn: 273728
This commit is contained in:
Evgeniy Stepanov 2016-06-24 21:15:53 +00:00
parent 0399226cf9
commit c7509de7cc
2 changed files with 21 additions and 13 deletions
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20
compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc
View File

@ -1237,17 +1237,15 @@ POST_SYSCALL(fcntl64)(long res, long fd, long cmd, long arg) {}
PRE_SYSCALL(pipe)(void *fildes) {}
POST_SYSCALL(pipe)(long res, void *fildes) {
if (res >= 0) {
if (fildes) POST_WRITE(fildes, sizeof(int));
}
if (res >= 0)
if (fildes) POST_WRITE(fildes, sizeof(int) * 2);
}
PRE_SYSCALL(pipe2)(void *fildes, long flags) {}
POST_SYSCALL(pipe2)(long res, void *fildes, long flags) {
if (res >= 0) {
if (fildes) POST_WRITE(fildes, sizeof(int));
}
if (res >= 0)
if (fildes) POST_WRITE(fildes, sizeof(int) * 2);
}
PRE_SYSCALL(dup)(long fildes) {}
@ -1880,13 +1878,11 @@ PRE_SYSCALL(socket)(long arg0, long arg1, long arg2) {}
POST_SYSCALL(socket)(long res, long arg0, long arg1, long arg2) {}
PRE_SYSCALL(socketpair)(long arg0, long arg1, long arg2, void *arg3) {}
PRE_SYSCALL(socketpair)(long arg0, long arg1, long arg2, int *sv) {}
POST_SYSCALL(socketpair)(long res, long arg0, long arg1, long arg2,
void *arg3) {
if (res >= 0) {
if (arg3) POST_WRITE(arg3, sizeof(int));
}
POST_SYSCALL(socketpair)(long res, long arg0, long arg1, long arg2, int *sv) {
if (res >= 0)
if (sv) POST_WRITE(sv, sizeof(int) * 2);
}
PRE_SYSCALL(socketcall)(long call, void *args) {}

14
compiler-rt/test/msan/Linux/syscalls.cc
View File

@ -19,7 +19,7 @@
sanity of their behaviour. */
int main(int argc, char *argv[]) {
char buf[1000];
char buf[1000] __attribute__((aligned(8)));
const int kTen = 10;
const int kFortyTwo = 42;
memset(buf, 0, sizeof(buf));
@ -111,5 +111,17 @@ int main(int argc, char *argv[]) {
assert(__msan_test_shadow(&p, sizeof(p)) == -1);
assert(__msan_test_shadow(buf, sizeof(buf)) >= 32);
__msan_poison(buf, sizeof(buf));
__sanitizer_syscall_post_pipe(0, (int *)buf);
assert(__msan_test_shadow(buf, sizeof(buf)) == 2 * sizeof(int));
__msan_poison(buf, sizeof(buf));
__sanitizer_syscall_post_pipe2(0, (int *)buf, 0);
assert(__msan_test_shadow(buf, sizeof(buf)) == 2 * sizeof(int));
__msan_poison(buf, sizeof(buf));
__sanitizer_syscall_post_socketpair(0, 0, 0, 0, (int *)buf);
assert(__msan_test_shadow(buf, sizeof(buf)) == 2 * sizeof(int));
return 0;
}