The patch titled
Subject: selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-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: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Subject: selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix
Date: Wed, 18 Dec 2024 15:36:15 +0000
Dereferencing a null pointer on Clang is not a good idea - it will
entirely optimise out the dereference. Make the pointer volatile to force
the access (and fault).
Link: https://lkml.kernel.org/r/20241218153615.2267571-1-kevin.brodsky@xxxxxxx
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202412140850.4TW4YBqc-lkp@xxxxxxxxx/
Signed-off-by: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Cc: Aruna Ramakrishna <aruna.ramakrishna@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Joey Gouly <joey.gouly@xxxxxxx>
Cc: Keith Lucas <keith.lucas@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/pkey_sighandler_tests.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/tools/testing/selftests/mm/pkey_sighandler_tests.c~selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix
+++ a/tools/testing/selftests/mm/pkey_sighandler_tests.c
@@ -163,7 +163,7 @@ static void *thread_segv_with_pkey0_disa
__write_pkey_reg(pkey_reg_restrictive_default());
/* Segfault (with SEGV_MAPERR) */
- *(int *)NULL = 1;
+ *(volatile int *)NULL = 1;
return NULL;
}
@@ -194,7 +194,7 @@ static void *thread_segv_maperr_ptr(void
__write_pkey_reg(pkey_reg);
/* Segfault */
- *(int *)NULL = 1;
+ *(volatile int *)NULL = 1;
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
return NULL;
}
_
Patches currently in -mm which might be from kevin.brodsky@xxxxxxx are
selftests-mm-fix-condition-in-uffd_move_test_common.patch
selftests-mm-fix-wmaybe-uninitialized-warnings.patch
selftests-mm-fix-strncpy-length.patch
selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests.patch
selftests-mm-fix-warray-bounds-warnings-in-pkey_sighandler_tests-fix.patch
selftests-mm-build-with-o2.patch
selftests-mm-remove-unused-pkey-helpers.patch
selftests-mm-define-types-using-typedef-in-pkey-helpersh.patch
selftests-mm-ensure-pkey-h-define-inline-functions-only.patch
selftests-mm-remove-empty-pkey-helper-definition.patch
selftests-mm-ensure-non-global-pkey-symbols-are-marked-static.patch
selftests-mm-use-sys_pkey-helpers-consistently.patch
selftests-mm-use-sys_pkey-helpers-consistently-fix.patch
selftests-mm-rename-pkey-register-macro.patch
selftests-mm-skip-pkey_sighandler_tests-if-support-is-missing.patch
selftests-mm-remove-x-permission-from-sigaltstack-mapping.patch
