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| author |   Qian Cai <cai@lca.pw> | 2020-03-05 23:48:52 -0500 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-05-20 23:39:56 +1000 |
| commit | c2e929b18cea6cbf71364f22d742d9aad7f4677a (patch) | |
| tree | f460c5ce1325b50f0c7d24d052f60e48bfc49329 /arch/powerpc/platforms/embedded6xx | |
| parent | powerpc/64s: Fix early_init_mmu section mismatch (diff) | |
| download | linux-dev-c2e929b18cea6cbf71364f22d742d9aad7f4677a.tar.xz linux-dev-c2e929b18cea6cbf71364f22d742d9aad7f4677a.zip | |
powerpc/64s/pgtable: fix an undefined behaviour
Booting a power9 server with hash MMU could trigger an undefined
behaviour because pud_offset(p4d, 0) will do,
0 >> (PAGE_SHIFT:16 + PTE_INDEX_SIZE:8 + H_PMD_INDEX_SIZE:10)
Fix it by converting pud_index() and friends to static inline
functions.
UBSAN: shift-out-of-bounds in arch/powerpc/mm/ptdump/ptdump.c:282:15
shift exponent 34 is too large for 32-bit type 'int'
CPU: 6 PID: 1 Comm: swapper/0 Not tainted 5.6.0-rc4-next-20200303+ #13
Call Trace:
dump_stack+0xf4/0x164 (unreliable)
ubsan_epilogue+0x18/0x78
__ubsan_handle_shift_out_of_bounds+0x160/0x21c
walk_pagetables+0x2cc/0x700
walk_pud at arch/powerpc/mm/ptdump/ptdump.c:282
(inlined by) walk_pagetables at arch/powerpc/mm/ptdump/ptdump.c:311
ptdump_check_wx+0x8c/0xf0
mark_rodata_ro+0x48/0x80
kernel_init+0x74/0x194
ret_from_kernel_thread+0x5c/0x74
Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Link: https://lore.kernel.org/r/20200306044852.3236-1-cai@lca.pw
Diffstat (limited to 'arch/powerpc/platforms/embedded6xx')
0 files changed, 0 insertions, 0 deletions