diff options
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index faed09531499..eeadff45e0e1 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -437,9 +437,15 @@ static int modify_pagetable(unsigned long start, unsigned long end, bool add, if (WARN_ON_ONCE(!PAGE_ALIGNED(start | end))) return -EINVAL; - /* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */ + /* Don't mess with any tables not fully in 1:1 mapping, vmemmap & kasan area */ +#ifdef CONFIG_KASAN + if (WARN_ON_ONCE(!(start >= KASAN_SHADOW_START && end <= KASAN_SHADOW_END) && + end > __abs_lowcore)) + return -EINVAL; +#else if (WARN_ON_ONCE(end > __abs_lowcore)) return -EINVAL; +#endif for (addr = start; addr < end; addr = next) { next = pgd_addr_end(addr, end); pgd = pgd_offset_k(addr); |