The patch titled
Subject: mm-kasan-kmsan-copy_from-to_kernel_nofault-fix
has been added to the -mm mm-unstable branch. Its filename is
mm-kasan-kmsan-copy_from-to_kernel_nofault-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kasan-kmsan-copy_from-to_kernel_nofault-fix.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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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-kasan-kmsan-copy_from-to_kernel_nofault-fix
Date: Tue Oct 15 04:53:38 PM PDT 2024
fix comment layout, per checkpatch
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Sabyrzhan Tasbolatov <snovitoll@xxxxxxxxx>
Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/kasan_test_c.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)
--- a/mm/kasan/kasan_test_c.c~mm-kasan-kmsan-copy_from-to_kernel_nofault-fix
+++ a/mm/kasan/kasan_test_c.c
@@ -1960,8 +1960,10 @@ static void copy_to_kernel_nofault_oob(s
char buf[128];
size_t size = sizeof(buf);
- /* This test currently fails with the HW_TAGS mode.
- * The reason is unknown and needs to be investigated. */
+ /*
+ * This test currently fails with the HW_TAGS mode. The reason is
+ * unknown and needs to be investigated.
+ */
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS);
ptr = kmalloc(size - KASAN_GRANULE_SIZE, GFP_KERNEL);
@@ -1969,16 +1971,16 @@ static void copy_to_kernel_nofault_oob(s
OPTIMIZER_HIDE_VAR(ptr);
/*
- * We test copy_to_kernel_nofault() to detect corrupted memory that is
- * being written into the kernel. In contrast, copy_from_kernel_nofault()
- * is primarily used in kernel helper functions where the source address
- * might be random or uninitialized. Applying KASAN instrumentation to
- * copy_from_kernel_nofault() could lead to false positives.
- * By focusing KASAN checks only on copy_to_kernel_nofault(),
- * we ensure that only valid memory is written to the kernel,
- * minimizing the risk of kernel corruption while avoiding
- * false positives in the reverse case.
- */
+ * We test copy_to_kernel_nofault() to detect corrupted memory that is
+ * being written into the kernel. In contrast,
+ * copy_from_kernel_nofault() is primarily used in kernel helper
+ * functions where the source address might be random or uninitialized.
+ * Applying KASAN instrumentation to copy_from_kernel_nofault() could
+ * lead to false positives. By focusing KASAN checks only on
+ * copy_to_kernel_nofault(), we ensure that only valid memory is
+ * written to the kernel, minimizing the risk of kernel corruption
+ * while avoiding false positives in the reverse case.
+ */
KUNIT_EXPECT_KASAN_FAIL(test,
copy_to_kernel_nofault(&buf[0], ptr, size));
KUNIT_EXPECT_KASAN_FAIL(test,
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
lib-alloc_tag_module_unload-must-wait-for-pending-kfree_rcu-calls-fix.patch
mm-consolidate-common-checks-in-hugetlb_get_unmapped_area-fix.patch
mm-memoryc-remove-stray-newline-at-top-of-file.patch
bootmem-stop-using-page-index-fix.patch
mm-kasan-kmsan-copy_from-to_kernel_nofault-fix.patch
