diff options
| author | Kees Cook <keescook@chromium.org> | 2019-07-16 16:27:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-16 19:23:22 -0700 |
| commit | 8e060c21ae2c265a2b596e9e7f9f97ec274151a4 (patch) | |
| tree | 89311e5adf37740675f8d07edc2a61e496b4c553 | |
| parent | d1a5dc5e6accbeaabe59e3d55b47f15a8b19c2bd (diff) | |
| download | linux-8e060c21ae2c265a2b596e9e7f9f97ec274151a4.tar.bz2 | |
lib/test_overflow.c: avoid tainting the kernel and fix wrap size
This adds __GFP_NOWARN to the kmalloc()-portions of the overflow test to
avoid tainting the kernel. Additionally fixes up the math on wrap size
to be architecture and page size agnostic.
Link: http://lkml.kernel.org/r/201905282012.0A8767E24@keescook
Fixes: ca90800a91ba ("test_overflow: Add memory allocation overflow tests")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Suggested-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/test_overflow.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/test_overflow.c b/lib/test_overflow.c index fc680562d8b6..7a4b6f6c5473 100644 --- a/lib/test_overflow.c +++ b/lib/test_overflow.c @@ -486,16 +486,17 @@ static int __init test_overflow_shift(void) * Deal with the various forms of allocator arguments. See comments above * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". */ -#define alloc010(alloc, arg, sz) alloc(sz, GFP_KERNEL) -#define alloc011(alloc, arg, sz) alloc(sz, GFP_KERNEL, NUMA_NO_NODE) +#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) +#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) +#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) #define alloc000(alloc, arg, sz) alloc(sz) #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) -#define alloc110(alloc, arg, sz) alloc(arg, sz, GFP_KERNEL) +#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) #define free0(free, arg, ptr) free(ptr) #define free1(free, arg, ptr) free(arg, ptr) -/* Wrap around to 8K */ -#define TEST_SIZE (9 << PAGE_SHIFT) +/* Wrap around to 16K */ +#define TEST_SIZE (5 * 4096) #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ static int __init test_ ## func (void *arg) \ |