The patch titled
Subject: selftest mm/mseal: fix test_seal_mremap_move_dontunmap_anyaddr
has been added to the -mm mm-unstable branch. Its filename is
selftest-mm-mseal-fix-test_seal_mremap_move_dontunmap_anyaddr.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftest-mm-mseal-fix-test_seal_mremap_move_dontunmap_anyaddr.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Jeff Xu <jeffxu@xxxxxxxxxxxx>
Subject: selftest mm/mseal: fix test_seal_mremap_move_dontunmap_anyaddr
Date: Wed, 7 Aug 2024 21:23:20 +0000
the syscall remap accepts following:
mremap(src, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, dst)
when the src is sealed, the call will fail with error code:
EPERM
Previously, the test uses hard-coded 0xdeaddead as dst, and it
will fail on the system with newer glibc installed.
This patch removes test's dependency on glibc for mremap(), also
fix the test and remove the hardcoded address.
Link: https://lkml.kernel.org/r/20240807212320.2831848-1-jeffxu@xxxxxxxxxxxx
Fixes: 4926c7a52de7 ("selftest mm/mseal memory sealing")
Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxxxx>
Reported-by: Pedro Falcato <pedro.falcato@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/mseal_test.c | 57 +++++++++++++---------
1 file changed, 36 insertions(+), 21 deletions(-)
--- a/tools/testing/selftests/mm/mseal_test.c~selftest-mm-mseal-fix-test_seal_mremap_move_dontunmap_anyaddr
+++ a/tools/testing/selftests/mm/mseal_test.c
@@ -110,6 +110,16 @@ static int sys_madvise(void *start, size
return sret;
}
+static void *sys_mremap(void *addr, size_t old_len, size_t new_len,
+ unsigned long flags, void *new_addr)
+{
+ void *sret;
+
+ errno = 0;
+ sret = (void *) syscall(__NR_mremap, addr, old_len, new_len, flags, new_addr);
+ return sret;
+}
+
static int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
{
int ret = syscall(__NR_pkey_alloc, flags, init_val);
@@ -1115,12 +1125,12 @@ static void test_seal_mremap_shrink(bool
}
/* shrink from 4 pages to 2 pages. */
- ret2 = mremap(ptr, size, 2 * page_size, 0, 0);
+ ret2 = sys_mremap(ptr, size, 2 * page_size, 0, 0);
if (seal) {
- FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
+ FAIL_TEST_IF_FALSE(ret2 == (void *) MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
} else {
- FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);
+ FAIL_TEST_IF_FALSE(ret2 != (void *) MAP_FAILED);
}
@@ -1147,7 +1157,7 @@ static void test_seal_mremap_expand(bool
}
/* expand from 2 page to 4 pages. */
- ret2 = mremap(ptr, 2 * page_size, 4 * page_size, 0, 0);
+ ret2 = sys_mremap(ptr, 2 * page_size, 4 * page_size, 0, 0);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1180,7 +1190,7 @@ static void test_seal_mremap_move(bool s
}
/* move from ptr to fixed address. */
- ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr);
+ ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1299,7 +1309,7 @@ static void test_seal_mremap_shrink_fixe
}
/* mremap to move and shrink to fixed address */
- ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
newAddr);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
@@ -1330,7 +1340,7 @@ static void test_seal_mremap_expand_fixe
}
/* mremap to move and expand to fixed address */
- ret2 = mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ ret2 = sys_mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED,
newAddr);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
@@ -1361,7 +1371,7 @@ static void test_seal_mremap_move_fixed(
}
/* mremap to move to fixed address */
- ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr);
+ ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1390,14 +1400,13 @@ static void test_seal_mremap_move_fixed_
/*
* MREMAP_FIXED can move the mapping to zero address
*/
- ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
0);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
} else {
FAIL_TEST_IF_FALSE(ret2 == 0);
-
}
REPORT_TEST_PASS();
@@ -1420,13 +1429,13 @@ static void test_seal_mremap_move_dontun
}
/* mremap to move, and don't unmap src addr. */
- ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0);
+ ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
} else {
+ /* kernel will allocate a new address */
FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);
-
}
REPORT_TEST_PASS();
@@ -1434,7 +1443,7 @@ static void test_seal_mremap_move_dontun
static void test_seal_mremap_move_dontunmap_anyaddr(bool seal)
{
- void *ptr;
+ void *ptr, *ptr2;
unsigned long page_size = getpagesize();
unsigned long size = 4 * page_size;
int ret;
@@ -1449,24 +1458,30 @@ static void test_seal_mremap_move_dontun
}
/*
- * The 0xdeaddead should not have effect on dest addr
- * when MREMAP_DONTUNMAP is set.
+ * The new address is any address that not allocated.
+ * use allocate/free to similate that.
+ */
+ setup_single_address(size, &ptr2);
+ FAIL_TEST_IF_FALSE(ptr2 != (void *)-1);
+ ret = sys_munmap(ptr2, size);
+ FAIL_TEST_IF_FALSE(!ret);
+
+ /*
+ * remap to any address.
*/
- ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP,
- 0xdeaddead);
+ ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP,
+ (void *) ptr2);
if (seal) {
FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
FAIL_TEST_IF_FALSE(errno == EPERM);
} else {
- FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);
- FAIL_TEST_IF_FALSE((long)ret2 != 0xdeaddead);
-
+ /* remap success and return ptr2 */
+ FAIL_TEST_IF_FALSE(ret2 == ptr2);
}
REPORT_TEST_PASS();
}
-
static void test_seal_merge_and_split(void)
{
void *ptr;
_
Patches currently in -mm which might be from jeffxu@xxxxxxxxxxxx are
selftest-mm-mseal-fix-test_seal_mremap_move_dontunmap_anyaddr.patch
