Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [PATCH v2] powerpc/kprobes: Fix Oops by passing ppc_inst as a pointer to emulate_step() on ppc32 | Date | Sat, 26 Jun 2021 20:37:22 +1000 |
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On Wed, 23 Jun 2021 05:23:30 +0000 (UTC), Christophe Leroy wrote: > Trying to use a kprobe on ppc32 results in the below splat: > BUG: Unable to handle kernel data access on read at 0x7c0802a6 > Faulting instruction address: 0xc002e9f0 > Oops: Kernel access of bad area, sig: 11 [#1] > BE PAGE_SIZE=4K PowerPC 44x Platform > Modules linked in: > CPU: 0 PID: 89 Comm: sh Not tainted 5.13.0-rc1-01824-g3a81c0495fdb #7 > NIP: c002e9f0 LR: c0011858 CTR: 00008a47 > REGS: c292fd50 TRAP: 0300 Not tainted (5.13.0-rc1-01824-g3a81c0495fdb) > MSR: 00009000 <EE,ME> CR: 24002002 XER: 20000000 > DEAR: 7c0802a6 ESR: 00000000 > <snip> > NIP [c002e9f0] emulate_step+0x28/0x324 > LR [c0011858] optinsn_slot+0x128/0x10000 > Call Trace: > opt_pre_handler+0x7c/0xb4 (unreliable) > optinsn_slot+0x128/0x10000 > ret_from_syscall+0x0/0x28 > > [...]
Applied to powerpc/next.
[1/1] powerpc/kprobes: Fix Oops by passing ppc_inst as a pointer to emulate_step() on ppc32 https://git.kernel.org/powerpc/c/511eea5e2ccdfdbf3d626bde0314e551f247dd18
cheers
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