57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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// SPDX-License-Identifier: MPL-2.0
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#define _GNU_SOURCE
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#include <sys/fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <string.h>
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#include "../test.h"
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#define PAGE_SIZE 4096
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const char *filename = "testfile";
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FN_TEST(mprotect_shared_writable_mapping_on_read_only_file)
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{
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int fd = TEST_SUCC(open(filename, O_RDWR | O_CREAT | O_TRUNC, 0600));
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TEST_SUCC(ftruncate(fd, PAGE_SIZE));
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TEST_SUCC(write(fd, "AAAA", 5));
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TEST_SUCC(close(fd));
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fd = TEST_SUCC(open(filename, O_RDONLY));
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char *addr =
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CHECK_WITH(mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SHARED, fd, 0),
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_ret != MAP_FAILED);
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TEST_ERRNO(mprotect(addr, PAGE_SIZE, PROT_READ | PROT_WRITE), EACCES);
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TEST_SUCC(close(fd));
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TEST_SUCC(unlink(filename));
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}
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END_TEST()
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FN_TEST(mprotect_private_writable_mapping_copy_on_write)
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{
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int fd = TEST_SUCC(open(filename, O_RDWR | O_CREAT | O_TRUNC, 0600));
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TEST_SUCC(ftruncate(fd, PAGE_SIZE));
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TEST_SUCC(write(fd, "AAAA", 5));
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char *addr1 =
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CHECK_WITH(mmap(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0),
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_ret != MAP_FAILED);
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char *addr2 =
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CHECK_WITH(mmap(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0),
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_ret != MAP_FAILED);
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TEST_RES(strcmp(addr1, "AAAA"), _ret == 0);
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TEST_RES(strcmp(addr2, "AAAA"), _ret == 0);
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TEST_SUCC(mprotect(addr1, PAGE_SIZE, PROT_READ | PROT_WRITE));
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memcpy(addr1, "BBBB", 5);
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TEST_RES(strcmp(addr1, "BBBB"), _ret == 0);
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TEST_RES(strcmp(addr2, "AAAA"), _ret == 0);
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TEST_SUCC(close(fd));
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TEST_SUCC(unlink(filename));
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}
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END_TEST()
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