[LTP] [PATCH 0/2] Regression test for 49ccf2c3cafb

[LTP] [PATCH 0/2] Regression test for 49ccf2c3cafb

[Andrea Cervesato]

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
Andrea Cervesato (2):
      lapi: add PROT_MTE fallback
      hugemmap35: add regression test for 49ccf2c3cafb

 include/lapi/mman.h                                |   4 +
 runtest/hugetlb                                    |   1 +
 testcases/kernel/mem/.gitignore                    |   1 +
 testcases/kernel/mem/hugetlb/hugemmap/hugemmap35.c | 105 +++++++++++++++++++++
 4 files changed, 111 insertions(+)
---
base-commit: d139524b04d360c4dabaee61a6066a9a52b0e454
change-id: 20260715-hugemmap35-fdc484ee4bbf

Best regards,
-- 
Andrea Cervesato <andrea.cervesato@suse.com>


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[LTP] [PATCH 1/2] lapi: add PROT_MTE fallback

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 include/lapi/mman.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/lapi/mman.h b/include/lapi/mman.h
index edd517c6e0ebad98f01530b9ac2a7c90cdcaced8..ca72ffd484129b9e8c9165816544da0d8d0ea06a 100644
--- a/include/lapi/mman.h
+++ b/include/lapi/mman.h
@@ -11,6 +11,10 @@
 #include "config.h"
 #include "lapi/syscalls.h"
 
+#ifndef PROT_MTE
+# define PROT_MTE 0x20
+#endif
+
 #ifndef HAVE_STRUCT_CACHESTAT_RANGE
 struct cachestat_range {
 	uint64_t off;

-- 
2.51.0


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[LTP] [PATCH 2/2] hugemmap35: add regression test for 49ccf2c3cafb

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Add a regression test verifying that a hugetlbfs file can be mapped
with PROT_MTE even when MAP_HUGETLB is not set in the mmap() flags.

Before the referenced commit, VM_MTE_ALLOWED was not set early enough
for hugetlbfs file mappings, so such an mmap() was wrongly rejected.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/hugetlb                                    |   1 +
 testcases/kernel/mem/.gitignore                    |   1 +
 testcases/kernel/mem/hugetlb/hugemmap/hugemmap35.c | 105 +++++++++++++++++++++
 3 files changed, 107 insertions(+)

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 0896d3c941f068628f53c31197b293906c4ecba6..8ee0e6f828cb1954e03d67d40fe691d6521361bf 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -36,6 +36,7 @@ hugemmap30 hugemmap30
 hugemmap31 hugemmap31
 hugemmap32 hugemmap32
 hugemmap34 hugemmap34
+hugemmap35 hugemmap35
 hugemmap05_1 hugemmap05 -m
 hugemmap05_2 hugemmap05 -s
 hugemmap05_3 hugemmap05 -s -m
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index b4455de51d6d6a9cc3d8b7ff392fc3ea9e95890a..0e59035dfdcf759aa16c069575bb1f4eb58f321c 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -36,6 +36,7 @@
 /hugetlb/hugemmap/hugemmap31
 /hugetlb/hugemmap/hugemmap32
 /hugetlb/hugemmap/hugemmap34
+/hugetlb/hugemmap/hugemmap35
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap35.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap35.c
new file mode 100644
index 0000000000000000000000000000000000000000..1c11013e0de6b6dd870e3ffc48562912a44cf7f7
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap35.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Test that :manpage:`mmap(2)` accepts ``PROT_MTE`` for hugetlbfs file
+ * mappings that do not specify ``MAP_HUGETLB``.
+ *
+ * On arm64, hugetlbfs file mappings must get ``VM_MTE_ALLOWED`` before mmap
+ * flag validation. This is needed because mapping a hugetlbfs file does not
+ * have to use ``MAP_HUGETLB``. The test needs root to reserve huge pages and
+ * mount hugetlbfs.
+ */
+
+#define _GNU_SOURCE
+
+#include "tst_test.h"
+#include "hugetlb.h"
+#include "lapi/mman.h"
+#include "lapi/mmap.h"
+
+#define MNTPOINT "hugetlbfs/"
+
+static int fd = -1;
+static long hpage_size;
+
+#define TC(x) {x, #x}
+
+static struct tcase {
+	int flags;
+	const char *desc;
+} tcases[] = {
+	TC(MAP_SHARED),
+	TC(MAP_PRIVATE),
+};
+
+static void run(unsigned int n)
+{
+	struct tcase *tc = &tcases[n];
+	volatile char *ptr;
+
+	TESTPTR(mmap(NULL, hpage_size, PROT_READ | PROT_WRITE | PROT_MTE,
+		     tc->flags, fd, 0));
+
+	if (TST_RET_PTR == MAP_FAILED) {
+		if (TST_ERR == ENOMEM)
+			tst_brk(TCONF, "Not enough huge pages");
+
+		tst_res(TFAIL | TTERRNO, "mmap(PROT_MTE, %s) without MAP_HUGETLB failed",
+			tc->desc);
+		return;
+	}
+
+	ptr = TST_RET_PTR;
+	*ptr = 1;
+
+	SAFE_MUNMAP(TST_RET_PTR, hpage_size);
+
+	tst_res(TPASS, "mmap(PROT_MTE, %s) without MAP_HUGETLB passed", tc->desc);
+}
+
+static void setup(void)
+{
+	hpage_size = tst_get_hugepage_size();
+	if (!hpage_size)
+		tst_brk(TCONF, "Huge pages are not supported");
+
+	TESTPTR(mmap(NULL, hpage_size, PROT_READ | PROT_MTE,
+		     MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0));
+
+	if (TST_RET_PTR == MAP_FAILED)
+		tst_brk(TCONF | TTERRNO, "PROT_MTE is not supported with MAP_HUGETLB");
+
+	SAFE_MUNMAP(TST_RET_PTR, hpage_size);
+
+	fd = tst_creat_unlinked(MNTPOINT, 0, 0600);
+	SAFE_FTRUNCATE(fd, hpage_size);
+}
+
+static void cleanup(void)
+{
+	if (fd != -1)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.test = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.tcnt = ARRAY_SIZE(tcases),
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.hugepages = { 2, TST_NEEDS },
+	.supported_archs = (const char *const []) {
+		"aarch64",
+		NULL
+	},
+	.tags = (const struct tst_tag[]) {
+		{"linux-git", "49ccf2c3cafb"},
+		{}
+	},
+};

-- 
2.51.0


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Re: [LTP] lapi: add PROT_MTE fallback

[linuxtestproject.agent]

Hi Andrea,

On Wed, 15 Jul 2026, Andrea Cervesato wrote:
> lapi: add PROT_MTE fallback

Verdict - Reviewed

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH 2/2] hugemmap35: add regression test for 49ccf2c3cafb

[Cyril Hrubis]

Hi!
For the patchset:

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

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Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 0/2] Regression test for 49ccf2c3cafb

[Andrea Cervesato via ltp]

Merged, Thanks!

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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