diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2023-02-09 22:05:11 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-03-20 11:02:51 +0100 |
| commit | 557b19709da97bc93ea5cf61926ca05800c15a13 (patch) | |
| tree | f1213e5c5ba017bf3a3f490875cccb5614704793 /arch/s390/mm/vmem.c | |
| parent | e4c31004d3348202d4bc0bcdf662bf9d9d3e11cb (diff) | |
s390/kasan: move shadow mapping to decompressor
Since regular paging structs are initialized in decompressor already
move KASAN shadow mapping to decompressor as well. This helps to avoid
allocating KASAN required memory in 1 large chunk, de-duplicate paging
structs creation code and start the uncompressed kernel with KASAN
instrumentation right away. This also allows to avoid all pitfalls
accidentally calling KASAN instrumented code during KASAN initialization.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 4113a7ffa149..242f95aa9801 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -5,6 +5,7 @@ #include <linux/memory_hotplug.h> #include <linux/memblock.h> +#include <linux/kasan.h> #include <linux/pfn.h> #include <linux/mm.h> #include <linux/init.h> @@ -664,6 +665,9 @@ static void __init memblock_region_swap(void *a, void *b, int size) swap(*(struct memblock_region *)a, *(struct memblock_region *)b); } +#ifdef CONFIG_KASAN +#define __sha(x) ((unsigned long)kasan_mem_to_shadow((void *)x)) +#endif /* * map whole physical memory to virtual memory (identity mapping) * we reserve enough space in the vmalloc area for vmemmap to hotplug @@ -733,6 +737,13 @@ void __init vmem_map_init(void) SET_MEMORY_RW | SET_MEMORY_NX); } +#ifdef CONFIG_KASAN + for_each_mem_range(i, &base, &end) + __set_memory(__sha(base), + (__sha(end) - __sha(base)) >> PAGE_SHIFT, + SET_MEMORY_RW | SET_MEMORY_NX); +#endif + __set_memory((unsigned long)_stext, (unsigned long)(_etext - _stext) >> PAGE_SHIFT, SET_MEMORY_RO | SET_MEMORY_X); |