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a27c5d2fb7
Previously we were only checking that each of the virtual pages in the specified range were valid. This made it possible to pass in negative buffer sizes to some syscalls as long as (address) and (address+size) were on the same page.
107 lines
4.2 KiB
C++
107 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#define EXPECT_OK(syscall, address, size) \
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do { \
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rc = syscall(fd, (void*)(address), (size_t)(size)); \
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if (rc < 0) { \
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fprintf(stderr, "Expected success: " #syscall "(%p, %zu), got rc=%d, errno=%d\n", (void*)(address), (size_t)(size), rc, errno); \
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} \
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} while(0)
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#define EXPECT_EFAULT(syscall, address, size) \
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do { \
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rc = syscall(fd, (void*)(address), (size_t)(size)); \
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if (rc >= 0 || errno != EFAULT) { \
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fprintf(stderr, "Expected EFAULT: " #syscall "(%p, %zu), got rc=%d, errno=%d\n", (void*)(address), (size_t)(size), rc, errno); \
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} \
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} while(0)
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#define EXPECT_EFAULT_NO_FD(syscall, address, size) \
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do { \
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rc = syscall((address), (size_t)(size)); \
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if (rc >= 0 || errno != EFAULT) { \
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fprintf(stderr, "Expected EFAULT: " #syscall "(%p, %zu), got rc=%d, errno=%d\n", (void*)(address), (size_t)(size), rc, errno); \
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} \
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} while(0)
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int main(int, char**)
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{
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int fd = open("/dev/zero", O_RDONLY);
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int rc;
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// Test a one-page mapping (4KB)
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u8* one_page = (u8*)mmap(nullptr, 4096, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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ASSERT(one_page);
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EXPECT_OK(read, one_page, 4096);
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EXPECT_EFAULT(read, one_page, 4097);
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EXPECT_EFAULT(read, one_page - 1, 4096);
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// Test a two-page mapping (8KB)
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u8* two_page = (u8*)mmap(nullptr, 8192, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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ASSERT(two_page);
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EXPECT_OK(read, two_page, 4096);
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EXPECT_OK(read, two_page + 4096, 4096);
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EXPECT_OK(read, two_page, 8192);
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EXPECT_OK(read, two_page + 4095, 4097);
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EXPECT_OK(read, two_page + 1, 8191);
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EXPECT_EFAULT(read, two_page, 8193);
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EXPECT_EFAULT(read, two_page - 1, 1);
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// Check validation of pages between the first and last address.
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ptrdiff_t distance = two_page - one_page;
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EXPECT_EFAULT(read, one_page, (u32)distance + 1024);
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// Test every kernel page just because.
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for (u64 kernel_address = 0xc0000000; kernel_address <= 0xffffffff; kernel_address += PAGE_SIZE) {
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EXPECT_EFAULT(read, (void*)kernel_address, 1);
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}
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char buffer[4096];
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EXPECT_EFAULT_NO_FD(dbgputstr, buffer, 0xffffff00);
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// Test the page just below where the kernel VM begins.
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u8* jerk_page = (u8*)mmap((void*)(0xc0000000 - PAGE_SIZE), PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
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ASSERT(jerk_page == (void*)(0xc0000000 - PAGE_SIZE));
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EXPECT_OK(read, jerk_page, 4096);
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EXPECT_EFAULT(read, jerk_page, 4097);
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// Test something that would wrap around the 2^32 mark.
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EXPECT_EFAULT(read, jerk_page, 0x50000000);
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return 0;
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}
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