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lkdtm/bugs: Add ARRAY_BOUNDS to selftests 

Add CONFIG hints about why the ARRAY_BOUNDS test might fail, and
similarly include the CONFIGs needed to pass the ARRAY_BOUNDS test via
the selftests, and add to selftests.

Cc: kernelci@groups.io
Suggested-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210818174855.2307828-2-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2021-08-18 10:48:52 -07:00 committed by Greg Kroah-Hartman
parent 09cbd1df7d
commit c75be56e35
3 changed files with 4 additions and 0 deletions
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1
drivers/misc/lkdtm/bugs.c
View File

@ -267,6 +267,7 @@ void lkdtm_ARRAY_BOUNDS(void)
kfree(not_checked); kfree(not_checked);
kfree(checked); kfree(checked);
pr_err("FAIL: survived array bounds overflow!\n"); pr_err("FAIL: survived array bounds overflow!\n");
pr_expected_config(CONFIG_UBSAN_BOUNDS);
} }
void lkdtm_CORRUPT_LIST_ADD(void) void lkdtm_CORRUPT_LIST_ADD(void)

2
tools/testing/selftests/lkdtm/config
View File

@ -6,3 +6,5 @@ CONFIG_HARDENED_USERCOPY=y
# CONFIG_HARDENED_USERCOPY_FALLBACK is not set # CONFIG_HARDENED_USERCOPY_FALLBACK is not set
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y
CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y
CONFIG_UBSAN_BOUNDS=y
CONFIG_UBSAN_TRAP=y

1
tools/testing/selftests/lkdtm/tests.txt
View File

@ -7,6 +7,7 @@ EXCEPTION
#EXHAUST_STACK Corrupts memory on failure #EXHAUST_STACK Corrupts memory on failure
#CORRUPT_STACK Crashes entire system on success #CORRUPT_STACK Crashes entire system on success
#CORRUPT_STACK_STRONG Crashes entire system on success #CORRUPT_STACK_STRONG Crashes entire system on success
ARRAY_BOUNDS
CORRUPT_LIST_ADD list_add corruption CORRUPT_LIST_ADD list_add corruption
CORRUPT_LIST_DEL list_del corruption CORRUPT_LIST_DEL list_del corruption
STACK_GUARD_PAGE_LEADING STACK_GUARD_PAGE_LEADING