system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-10-08 20:34:15 +00:00
Code Issues Packages Projects Releases Wiki Activity

powerpc/kasan: Fix shadow area set up for modules.

Browse source 
When loading modules, from time to time an Oops is encountered during
the init of shadow area for globals. This is due to the last page not
always being mapped depending on the exact distance between the start
and the end of the shadow area and the alignment with the page
addresses.

Fix this by aligning the starting address with the page address.

Fixes: 2edb16efc8 ("powerpc/32: Add KASAN support")
Cc: stable@vger.kernel.org # v5.2+
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4f887e9b77d0d725cbb52035c7ece485c1c5fc14.1565361881.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-09 14:58:10 +00:00 committed by Michael Ellerman
parent 45ff3c5595
commit 663c0c9496
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/mm/kasan/kasan_init_32.c
View file

@ -87,7 +87,7 @@ static int __ref kasan_init_region(void *start, size_t size)
if (!slab_is_available())
block = memblock_alloc(k_end - k_start, PAGE_SIZE);
for (k_cur = k_start; k_cur < k_end; k_cur += PAGE_SIZE) {
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur);
void *va = block ? block + k_cur - k_start : kasan_get_one_page();
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);