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[Compiler-rt][MSan]Fix shmat testcase: Pass SHMLBA-alligned address to shmat 

Reviewers: samsonov

Subscribers: jaydeep, sagar, llvm-commits

Differential Revision: http://reviews.llvm.org/D17262

llvm-svn: 261837
This commit is contained in:
Mohit K. Bhakkad 2016-02-25 08:07:44 +00:00
parent eecc3c826a
commit 72c3cce484
1 changed files with 11 additions and 7 deletions
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18
compiler-rt/lib/msan/tests/msan_test.cc
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@ -1214,17 +1214,21 @@ TEST(MemorySanitizer, shmctl) {
}
TEST(MemorySanitizer, shmat) {
void *p = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(MAP_FAILED, p);
const int kShmSize = 4096;
void *mapping_start = mmap(NULL, kShmSize + SHMLBA, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(MAP_FAILED, mapping_start);
void *p = (void *)(((unsigned long)mapping_start + SHMLBA - 1) / SHMLBA * SHMLBA);
// p is now SHMLBA-aligned;
((char *)p)[10] = *GetPoisoned<U1>();
((char *)p)[4095] = *GetPoisoned<U1>();
((char *)p)[kShmSize - 1] = *GetPoisoned<U1>();
int res = munmap(p, 4096);
int res = munmap(mapping_start, kShmSize + SHMLBA);
ASSERT_EQ(0, res);
int id = shmget(IPC_PRIVATE, 4096, 0644 | IPC_CREAT);
int id = shmget(IPC_PRIVATE, kShmSize, 0644 | IPC_CREAT);
ASSERT_GT(id, -1);
void *q = shmat(id, p, 0);
@ -1232,7 +1236,7 @@ TEST(MemorySanitizer, shmat) {
EXPECT_NOT_POISONED(((char *)q)[0]);
EXPECT_NOT_POISONED(((char *)q)[10]);
EXPECT_NOT_POISONED(((char *)q)[4095]);
EXPECT_NOT_POISONED(((char *)q)[kShmSize - 1]);
res = shmdt(q);
ASSERT_EQ(0, res);