On Wed, Jun 19, 2024 at 4:25 PM Kees Cook <kees@xxxxxxxxxx> wrote: > > Since arch_pick_mmap_layout() is an inline for non-MMU systems, disable > this test there. > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > Closes: https://lore.kernel.org/oe-kbuild-all/202406160505.uBge6TMY-lkp@xxxxxxxxx/ > Signed-off-by: Kees Cook <kees@xxxxxxxxxx> Hello! This looks good to me. And seems to fix the problem. Thanks for the fix! Reviewed-by: Rae Moar <rmoar@xxxxxxxxxx> -Rae > --- > Resending as v2 with Shuah in To: > --- > Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> > Cc: Brendan Higgins <brendan.higgins@xxxxxxxxx> > Cc: David Gow <davidgow@xxxxxxxxxx> > Cc: Rae Moar <rmoar@xxxxxxxxxx> > Cc: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: linux-kselftest@xxxxxxxxxxxxxxx > Cc: kunit-dev@xxxxxxxxxxxxxxxx > Cc: linux-hardening@xxxxxxxxxxxxxxx > Cc: linux-mm@xxxxxxxxx > --- > lib/kunit/user_alloc.c | 4 ++++ > lib/usercopy_kunit.c | 5 +++++ > mm/util.c | 2 ++ > 3 files changed, 11 insertions(+) > > diff --git a/lib/kunit/user_alloc.c b/lib/kunit/user_alloc.c > index 76d3d1345ed7..ae935df09a5e 100644 > --- a/lib/kunit/user_alloc.c > +++ b/lib/kunit/user_alloc.c > @@ -30,6 +30,10 @@ static int kunit_attach_mm(void) > if (current->mm) > return 0; > > + /* arch_pick_mmap_layout() is only sane with MMU systems. */ > + if (!IS_ENABLED(CONFIG_MMU)) > + return -EINVAL; > + > mm = mm_alloc(); > if (!mm) > return -ENOMEM; > diff --git a/lib/usercopy_kunit.c b/lib/usercopy_kunit.c > index 45f1e558c464..e819561a540d 100644 > --- a/lib/usercopy_kunit.c > +++ b/lib/usercopy_kunit.c > @@ -290,6 +290,11 @@ static int usercopy_test_init(struct kunit *test) > struct usercopy_test_priv *priv; > unsigned long user_addr; > > + if (!IS_ENABLED(CONFIG_MMU)) { > + kunit_skip(test, "Userspace allocation testing not available on non-MMU systems"); > + return 0; > + } > + > priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL); > KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv); > test->priv = priv; > diff --git a/mm/util.c b/mm/util.c > index df37c47d9374..e70e8e439258 100644 > --- a/mm/util.c > +++ b/mm/util.c > @@ -484,7 +484,9 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) > clear_bit(MMF_TOPDOWN, &mm->flags); > } > #endif > +#ifdef CONFIG_MMU > EXPORT_SYMBOL_IF_KUNIT(arch_pick_mmap_layout); > +#endif > > /** > * __account_locked_vm - account locked pages to an mm's locked_vm > -- > 2.34.1 >
