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Implement load at fixed address feature

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Bug: http://b/24683631
Change-Id: I3a39ab526c8f9e213339b60e135e5459d0f41381
This commit is contained in:
Dmitriy Ivanov
2015-10-07 16:34:20 -07:00
parent 6a4ddeb56e
commit 126af757c6
4 changed files with 77 additions and 3 deletions
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37
tests/dlext_test.cpp
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@@ -343,6 +343,43 @@ TEST_F(DlExtTest, ReservedHintTooSmall) {
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, LoadAtFixedAddress) {
void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
ASSERT_TRUE(start != MAP_FAILED);
munmap(start, LIBSIZE);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
extinfo.reserved_addr = start;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_GE(reinterpret_cast<void*>(f), start);
EXPECT_LT(reinterpret_cast<void*>(f), reinterpret_cast<char*>(start) + LIBSIZE);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, LoadAtFixedAddressTooSmall) {
void* start = mmap(nullptr, LIBSIZE + PAGE_SIZE, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
munmap(start, LIBSIZE + PAGE_SIZE);
void* new_addr = mmap(reinterpret_cast<uint8_t*>(start) + PAGE_SIZE, LIBSIZE, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(new_addr != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
extinfo.reserved_addr = start;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
}
class DlExtRelroSharingTest : public DlExtTest {
protected:
virtual void SetUp() {