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af11dee436
linux/arch/powerpc
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Christophe Leroy af11dee436 powerpc/32s: Fix shift-out-of-bounds in KASAN init 
================================================================================
UBSAN: shift-out-of-bounds in arch/powerpc/mm/kasan/book3s_32.c:22:23
shift exponent -1 is negative
CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.5-gentoo-PowerMacG4 #9
Call Trace:
[c214be60] [c0ba0048] dump_stack_lvl+0x80/0xb0 (unreliable)
[c214be80] [c0b99288] ubsan_epilogue+0x10/0x5c
[c214be90] [c0b98fe0] __ubsan_handle_shift_out_of_bounds+0x94/0x138
[c214bf00] [c1c0f010] kasan_init_region+0xd8/0x26c
[c214bf30] [c1c0ed84] kasan_init+0xc0/0x198
[c214bf70] [c1c08024] setup_arch+0x18/0x54c
[c214bfc0] [c1c037f0] start_kernel+0x90/0x33c
[c214bff0] [00003610] 0x3610
================================================================================

This happens when the directly mapped memory is a power of 2.

Fix it by checking the shift and set the result to 0 when shift is -1

Fixes: 7974c47326 ("powerpc/32s: Implement dedicated kasan_init_region()")
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215169
Link: https://lore.kernel.org/r/15cbc3439d4ad988b225e2119ec99502a5cc6ad3.1638261744.git.christophe.leroy@csgroup.eu
2021-11-30 22:44:39 +11:00
..
boot powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
configs powerpc/pseries: delete scanlog 2021-11-25 11:25:33 +11:00
crypto powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
include powerpc/64s: Get LPID bit width from device tree 2021-11-30 22:27:07 +11:00
kernel powerpc/modules: Don't WARN on first module allocation attempt 2021-11-30 22:44:32 +11:00
kexec powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
kvm powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
lib powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc/32s: Fix shift-out-of-bounds in KASAN init 2021-11-30 22:44:39 +11:00
net bpf ppc32: Access only if addr is kernel address 2021-11-25 11:25:32 +11:00
perf powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC 2021-11-30 17:15:49 +11:00
platforms powerpc/powermac: Add missing lockdep_register_key() 2021-11-30 22:44:39 +11:00
purgatory
sysdev powerpc/tsi108: make EXPORT_SYMBOL follow its function immediately 2021-11-25 11:25:32 +11:00
tools powerpc/head_check: Fix shellcheck errors 2021-08-17 22:52:02 +10:00
xmon powerpc/64s: guard optional TIDR SPR with CPU ftr test 2021-11-24 21:08:56 +11:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig powerpc/ftrace: Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on PPC32 2021-11-29 22:49:29 +11:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile Kbuild updates for v5.16 2021-11-08 09:15:45 -08:00
Makefile.postlink