mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-03 16:13:17 +01:00
tools/testing/selftests/vm/map_fixed_noreplace.c: add test for MAP_FIXED_NOREPLACE
Add a test for MAP_FIXED_NOREPLACE, based on some code originally by Jann Horn. This would have caught the overlap bug reported by Daniel Micay. I originally suggested to Michal that we create MAP_FIXED_NOREPLACE, but instead of writing a selftest I spent my time bike-shedding whether it should be called MAP_FIXED_SAFE/NOCLOBBER/WEAK/NEW .. mea culpa. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Michael Ellerman <[email protected]> Reviewed-by: Kees Cook <[email protected]> Reviewed-by: Khalid Aziz <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Jann Horn <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Florian Weimer <[email protected]> Cc: John Hubbard <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Abdul Haleem <[email protected]> Cc: Joel Stanley <[email protected]> Cc: Jason Evans <[email protected]> Cc: David Goldblatt <[email protected]> Cc: Daniel Micay <[email protected]> Cc: Shuah Khan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michael Ellerman authored and Linus Torvalds committed
1 parent
7eef5f97c1
commit
91cbacc345
3 files changed
+208
No files matched your search
@@ -13,3 +13,4 @@ mlock-random-test
|
||||
virtual_address_range
|
||||
gup_benchmark
|
||||
va_128TBswitch
|
||||
map_fixed_noreplace
|
||||
@@ -12,6 +12,7 @@ TEST_GEN_FILES += gup_benchmark
|
||||
TEST_GEN_FILES += hugepage-mmap
|
||||
TEST_GEN_FILES += hugepage-shm
|
||||
TEST_GEN_FILES += map_hugetlb
|
||||
TEST_GEN_FILES += map_fixed_noreplace
|
||||
TEST_GEN_FILES += map_populate
|
||||
TEST_GEN_FILES += mlock-random-test
|
||||
TEST_GEN_FILES += mlock2-tests
|
||||
|
||||
@@ -0,0 +1,206 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
/*
|
||||
* Test that MAP_FIXED_NOREPLACE works.
|
||||
*
|
||||
* Copyright 2018, Jann Horn <jannh@google.com>
|
||||
* Copyright 2018, Michael Ellerman, IBM Corporation.
|
||||
*/
|
||||
|
||||
#include <sys/mman.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#ifndef MAP_FIXED_NOREPLACE
|
||||
#define MAP_FIXED_NOREPLACE 0x100000
|
||||
#endif
|
||||
|
||||
#define BASE_ADDRESS (256ul * 1024 * 1024)
|
||||
|
||||
|
||||
static void dump_maps(void)
|
||||
{
|
||||
char cmd[32];
|
||||
|
||||
snprintf(cmd, sizeof(cmd), "cat /proc/%d/maps", getpid());
|
||||
system(cmd);
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
unsigned long flags, addr, size, page_size;
|
||||
char *p;
|
||||
|
||||
page_size = sysconf(_SC_PAGE_SIZE);
|
||||
|
||||
flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE;
|
||||
|
||||
// Check we can map all the areas we need below
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS;
|
||||
size = 5 * page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p == MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error: couldn't map the space we need for the test\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
if (munmap((void *)addr, 5 * page_size) != 0) {
|
||||
dump_maps();
|
||||
printf("Error: munmap failed!?\n");
|
||||
return 1;
|
||||
}
|
||||
printf("unmap() successful\n");
|
||||
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS + page_size;
|
||||
size = 3 * page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p == MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error: first mmap() failed unexpectedly\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Exact same mapping again:
|
||||
* base | free | new
|
||||
* +1 | mapped | new
|
||||
* +2 | mapped | new
|
||||
* +3 | mapped | new
|
||||
* +4 | free | new
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS;
|
||||
size = 5 * page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p != MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:1: mmap() succeeded when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Second mapping contained within first:
|
||||
*
|
||||
* base | free |
|
||||
* +1 | mapped |
|
||||
* +2 | mapped | new
|
||||
* +3 | mapped |
|
||||
* +4 | free |
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS + (2 * page_size);
|
||||
size = page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p != MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:2: mmap() succeeded when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Overlap end of existing mapping:
|
||||
* base | free |
|
||||
* +1 | mapped |
|
||||
* +2 | mapped |
|
||||
* +3 | mapped | new
|
||||
* +4 | free | new
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS + (3 * page_size);
|
||||
size = 2 * page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p != MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:3: mmap() succeeded when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Overlap start of existing mapping:
|
||||
* base | free | new
|
||||
* +1 | mapped | new
|
||||
* +2 | mapped |
|
||||
* +3 | mapped |
|
||||
* +4 | free |
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS;
|
||||
size = 2 * page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p != MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:4: mmap() succeeded when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Adjacent to start of existing mapping:
|
||||
* base | free | new
|
||||
* +1 | mapped |
|
||||
* +2 | mapped |
|
||||
* +3 | mapped |
|
||||
* +4 | free |
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS;
|
||||
size = page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p == MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:5: mmap() failed when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Adjacent to end of existing mapping:
|
||||
* base | free |
|
||||
* +1 | mapped |
|
||||
* +2 | mapped |
|
||||
* +3 | mapped |
|
||||
* +4 | free | new
|
||||
*/
|
||||
errno = 0;
|
||||
addr = BASE_ADDRESS + (4 * page_size);
|
||||
size = page_size;
|
||||
p = mmap((void *)addr, size, PROT_NONE, flags, -1, 0);
|
||||
printf("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
|
||||
|
||||
if (p == MAP_FAILED) {
|
||||
dump_maps();
|
||||
printf("Error:6: mmap() failed when it shouldn't have\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
addr = BASE_ADDRESS;
|
||||
size = 5 * page_size;
|
||||
if (munmap((void *)addr, size) != 0) {
|
||||
dump_maps();
|
||||
printf("Error: munmap failed!?\n");
|
||||
return 1;
|
||||
}
|
||||
printf("unmap() successful\n");
|
||||
|
||||
printf("OK\n");
|
||||
return 0;
|
||||
}
|
||||
Reference in new issue
Block a user