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Commit 7b9f35c9 authored by Christopher Ferris's avatar Christopher Ferris
Browse files

Change call to mmap64. 

The code was using an off64_t but calling mmap. This caused the code
to abort on 32 bit.

Add a unit test that would abort on the previous version.

Bug: 155662887

Test: New unit test passes.
Change-Id: I7a6efbc0d4227403c3d08a08deea56f239382157
parent 72fdec17

libutils/FileMap.cpp

+1 −1
Original line number Diff line number Diff line
@@ -195,7 +195,7 @@ bool FileMap::create(const char* origFileName, int fd, off64_t offset, size_t le 
    int prot = PROT_READ;

    if (!readOnly) prot |= PROT_WRITE;



    void* ptr = mmap(nullptr, adjLength, prot, flags, fd, adjOffset);

    void* ptr = mmap64(nullptr, adjLength, prot, flags, fd, adjOffset);

    if (ptr == MAP_FAILED) {

        if (errno == EINVAL && length == 0) {

            ptr = nullptr;

libutils/FileMap_test.cpp

+20 −0
Original line number Diff line number Diff line
@@ -32,3 +32,23 @@ TEST(FileMap, zero_length_mapping) { 
    ASSERT_EQ(0u, m.getDataLength());

    ASSERT_EQ(4096, m.getDataOffset());

}



TEST(FileMap, large_offset) {

    // Make sure that an offset > INT32_MAX will not fail the create

    // function. See http://b/155662887.

    TemporaryFile tf;

    ASSERT_TRUE(tf.fd != -1);



    off64_t offset = INT32_MAX + 1024LL;



    // Make the temporary file large enough to pass the mmap.

    ASSERT_EQ(offset, lseek64(tf.fd, offset, SEEK_SET));

    char value = 0;

    ASSERT_EQ(1, write(tf.fd, &value, 1));



    android::FileMap m;

    ASSERT_TRUE(m.create("test", tf.fd, offset, 0, true));

    ASSERT_STREQ("test", m.getFileName());

    ASSERT_EQ(0u, m.getDataLength());

    ASSERT_EQ(offset, m.getDataOffset());

}