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Naveen N. Rao 129c71829d powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06 
[ Upstream commit 3f5f766d5f7f95a69a630da3544a1a0cee1cdddf ]

Johan reported the below crash with test_bpf on ppc64 e5500:

  test_bpf: #296 ALU_END_FROM_LE 64: 0x0123456789abcdef -> 0x67452301 jited:1
  Oops: Exception in kernel mode, sig: 4 [#1]
  BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
  Modules linked in: test_bpf(+)
  CPU: 0 PID: 76 Comm: insmod Not tainted 5.14.0-03771-g98c2059e008a-dirty #1
  NIP:  8000000000061c3c LR: 80000000006dea64 CTR: 8000000000061c18
  REGS: c0000000032d3420 TRAP: 0700   Not tainted (5.14.0-03771-g98c2059e008a-dirty)
  MSR:  0000000080089000 <EE,ME>  CR: 88002822  XER: 20000000 IRQMASK: 0
  <...>
  NIP [8000000000061c3c] 0x8000000000061c3c
  LR [80000000006dea64] .__run_one+0x104/0x17c [test_bpf]
  Call Trace:
   .__run_one+0x60/0x17c [test_bpf] (unreliable)
   .test_bpf_init+0x6a8/0xdc8 [test_bpf]
   .do_one_initcall+0x6c/0x28c
   .do_init_module+0x68/0x28c
   .load_module+0x2460/0x2abc
   .__do_sys_init_module+0x120/0x18c
   .system_call_exception+0x110/0x1b8
   system_call_common+0xf0/0x210
  --- interrupt: c00 at 0x101d0acc
  <...>
  ---[ end trace 47b2bf19090bb3d0 ]---

  Illegal instruction

The illegal instruction turned out to be 'ldbrx' emitted for
BPF_FROM_[L|B]E, which was only introduced in ISA v2.06. Guard use of
the same and implement an alternative approach for older processors.

Fixes: 156d0e290e ("powerpc/ebpf/jit: Implement JIT compiler for extended BPF")
Reported-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Tested-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Acked-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d1e51c6fdf572062cf3009a751c3406bda01b832.1641468127.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-02-01 17:25:45 +01:00
..
alpha
arc
arm ARM: imx: rename DEBUG_IMX21_IMX27_UART to DEBUG_IMX27_UART 2022-01-27 10:54:11 +01:00
arm64 arm64: errata: Fix exec handling in erratum 1418040 workaround 2022-02-01 17:25:40 +01:00
c6x
csky perf: Protect perf_guest_cbs with RCU 2022-01-20 09:17:50 +01:00
h8300
hexagon
ia64
m68k
microblaze
mips MIPS: Octeon: Fix build errors using clang 2022-01-27 10:54:23 +01:00
nds32 perf: Protect perf_guest_cbs with RCU 2022-01-20 09:17:50 +01:00
nios2
openrisc openrisc: Add clone3 ABI wrapper 2022-01-27 10:54:06 +01:00
parisc parisc: Fix lpa and lpa_user defines 2022-01-27 10:54:26 +01:00
powerpc powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06 2022-02-01 17:25:45 +01:00
riscv perf: Protect perf_guest_cbs with RCU 2022-01-20 09:17:50 +01:00
s390 s390/hypfs: include z/VM guests with access control group set 2022-02-01 17:25:38 +01:00
sh
sparc
um um: registers: Rename function names to avoid conflicts and build problems 2022-01-27 10:54:18 +01:00
x86 x86/MCE/AMD: Allow thresholding interface updates after init 2022-02-01 17:25:42 +01:00
xtensa
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