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ARM: 9242/1: kasan: Only map modules if CONFIG_KASAN_VMALLOC=n 

In case CONFIG_KASAN_VMALLOC=y kasan_populate_vmalloc() allocates the
shadow pages dynamically. But even worse is that kasan_release_vmalloc()
releases them, which is not compatible with create_mapping() of
MODULES_VADDR..MODULES_END range:

BUG: Bad page state in process kworker/9:1  pfn:2068b
page:e5e06160 refcount:0 mapcount:0 mapping:00000000 index:0x0
flags: 0x1000(reserved)
raw: 00001000 e5e06164 e5e06164 00000000 00000000 00000000 ffffffff 00000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
bad because of flags: 0x1000(reserved)
Modules linked in: ip_tables
CPU: 9 PID: 154 Comm: kworker/9:1 Not tainted 5.4.188-... #1
Hardware name: LSI Axxia AXM55XX
Workqueue: events do_free_init
unwind_backtrace
show_stack
dump_stack
bad_page
free_pcp_prepare
free_unref_page
kasan_depopulate_vmalloc_pte
__apply_to_page_range
apply_to_existing_page_range
kasan_release_vmalloc
__purge_vmap_area_lazy
_vm_unmap_aliases.part.0
__vunmap
do_free_init
process_one_work
worker_thread
kthread

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Alex Sverdlin 2022-09-05 16:26:59 +01:00 committed by Russell King (Oracle)
parent 8770b9e575
commit 823f606ab6
1 changed files with 7 additions and 2 deletions
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9
arch/arm/mm/kasan_init.c
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@ -268,12 +268,17 @@ void __init kasan_init(void)
/*
* 1. The module global variables are in MODULES_VADDR ~ MODULES_END,
* so we need to map this area.
* so we need to map this area if CONFIG_KASAN_VMALLOC=n. With
* VMALLOC support KASAN will manage this region dynamically,
* refer to kasan_populate_vmalloc() and ARM's implementation of
* module_alloc().
* 2. PKMAP_BASE ~ PKMAP_BASE+PMD_SIZE's shadow and MODULES_VADDR
* ~ MODULES_END's shadow is in the same PMD_SIZE, so we can't
* use kasan_populate_zero_shadow.
*/
create_mapping((void *)MODULES_VADDR, (void *)(PKMAP_BASE + PMD_SIZE));
if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) && IS_ENABLED(CONFIG_MODULES))
create_mapping((void *)MODULES_VADDR, (void *)(MODULES_END));
create_mapping((void *)PKMAP_BASE, (void *)(PKMAP_BASE + PMD_SIZE));
/*
* KAsan may reuse the contents of kasan_early_shadow_pte directly, so