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
..
boot	powerpc/fsl/dts: Enable WA for erratum A-009885 on fman3l MDIO buses	2022-01-27 10:54:30 +01:00
configs	powerpc/config: Renable MTD_PHYSMAP_OF	2021-09-18 13:40:14 +02:00
crypto	crypto: powerpc/crc-vpmsum_test - Fix sparse endianness warning	2020-09-04 17:57:15 +10:00
include	powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06	2022-02-01 17:25:45 +01:00
kernel	powerpc/32: Fix boot failure with GCC latent entropy plugin	2022-02-01 17:25:42 +01:00
kexec	powerpc/kexec_file: Use current CPU info while setting up FDT	2021-05-11 14:47:35 +02:00
kvm	KVM: PPC: Book3S: Suppress failed alloc warning in H_COPY_TOFROM_GUEST	2022-01-27 10:54:22 +01:00
lib	powerpc/32: Fix boot failure with GCC latent entropy plugin	2022-02-01 17:25:42 +01:00
math-emu
mm	powerpc/32s: Fix kasan_init_region() for KASAN	2022-02-01 17:25:42 +01:00
net	powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06	2022-02-01 17:25:45 +01:00
oprofile	powerpc/oprofile: fix spelling mistake "contex" -> "context"	2020-08-25 01:31:33 +10:00
perf	powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC	2022-01-27 10:54:05 +01:00
platforms	powerpc/cell: Fix clang -Wimplicit-fallthrough warning	2022-01-27 10:54:30 +01:00
purgatory	powerpc/kexec_file: Enable early kernel OPAL calls	2020-07-29 23:47:55 +10:00
sysdev	powerpc/xive: Add missing null check after calling kmalloc	2022-01-27 10:54:09 +01:00
tools	powerpc/tools: Remove 90 line limit in checkpatch script	2020-09-08 22:57:11 +10:00
xmon	powerpc/xmon: Change printk() to pr_cont()	2020-12-30 11:54:16 +01:00
Kbuild	powerpc/kexec: Move kexec files into a dedicated subdir.	2019-11-21 15:41:34 +11:00
Kconfig	powerpc: Fix HAVE_HARDLOCKUP_DETECTOR_ARCH build configuration	2021-05-14 09:50:31 +02:00
Kconfig.debug	powerpc: iommu: fix build when neither PCI or IBMVIO is set	2021-05-14 09:50:34 +02:00
Makefile	Kbuild fixes for v5.10 (2nd)	2020-12-06 10:31:39 -08:00
Makefile.postlink	powerpc: unrel_branch_check.sh: use nm to find symbol value	2020-09-02 11:00:22 +10:00