From: LEROY Christophe <christophe.leroy@csgroup.eu>
To: Hari Bathini <hbathini@linux.ibm.com>,
"naveen.n.rao@linux.ibm.com" <naveen.n.rao@linux.ibm.com>,
"mpe@ellerman.id.au" <mpe@ellerman.id.au>,
"ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>
Cc: "paulus@samba.org" <paulus@samba.org>,
"andrii@kernel.org" <andrii@kernel.org>,
"kafai@fb.com" <kafai@fb.com>,
"songliubraving@fb.com" <songliubraving@fb.com>,
"yhs@fb.com" <yhs@fb.com>,
"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
"kpsingh@kernel.org" <kpsingh@kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Subject: Re: [PATCH v4 6/8] bpf ppc64: Access only if addr is kernel address
Date: Wed, 29 Sep 2021 11:44:37 +0000 [thread overview]
Message-ID: <dac0a043-51f0-24ba-b9fb-6cf53e4ce15f@csgroup.eu> (raw)
In-Reply-To: <20210929111855.50254-7-hbathini@linux.ibm.com>
Le 29/09/2021 à 13:18, Hari Bathini a écrit :
> From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
>
> On PPC64 with KUAP enabled, any kernel code which wants to
> access userspace needs to be surrounded by disable-enable KUAP.
> But that is not happening for BPF_PROBE_MEM load instruction.
> So, when BPF program tries to access invalid userspace address,
> page-fault handler considers it as bad KUAP fault:
>
> Kernel attempted to read user page (d0000000) - exploit attempt? (uid: 0)
>
> Considering the fact that PTR_TO_BTF_ID (which uses BPF_PROBE_MEM
> mode) could either be a valid kernel pointer or NULL but should
> never be a pointer to userspace address, execute BPF_PROBE_MEM load
> only if addr is kernel address, otherwise set dst_reg=0 and move on.
>
> This will catch NULL, valid or invalid userspace pointers. Only bad
> kernel pointer will be handled by BPF exception table.
>
> [Alexei suggested for x86]
> Suggested-by: Alexei Starovoitov <ast@kernel.org>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
>
> Changes in v4:
> * Used IS_ENABLED() instead of #ifdef.
> * Dropped the else case that is not applicable for PPC64.
>
>
> arch/powerpc/net/bpf_jit_comp64.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
> index 4170999371ee..e1ea64081ae1 100644
> --- a/arch/powerpc/net/bpf_jit_comp64.c
> +++ b/arch/powerpc/net/bpf_jit_comp64.c
> @@ -727,6 +727,32 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
> /* dst = *(u64 *)(ul) (src + off) */
> case BPF_LDX | BPF_MEM | BPF_DW:
> case BPF_LDX | BPF_PROBE_MEM | BPF_DW:
> + /*
> + * As PTR_TO_BTF_ID that uses BPF_PROBE_MEM mode could either be a valid
> + * kernel pointer or NULL but not a userspace address, execute BPF_PROBE_MEM
> + * load only if addr is kernel address (see is_kernel_addr()), otherwise
> + * set dst_reg=0 and move on.
> + */
> + if (BPF_MODE(code) == BPF_PROBE_MEM) {
> + EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], src_reg, off));
> + if (IS_ENABLED(CONFIG_PPC_BOOK3E_64))
> + PPC_LI64(b2p[TMP_REG_2], 0x8000000000000000ul);
> + else /* BOOK3S_64 */
> + PPC_LI64(b2p[TMP_REG_2], PAGE_OFFSET);
> + EMIT(PPC_RAW_CMPLD(b2p[TMP_REG_1], b2p[TMP_REG_2]));
> + PPC_BCC(COND_GT, (ctx->idx + 4) * 4);
> + EMIT(PPC_RAW_LI(dst_reg, 0));
> + /*
> + * Check if 'off' is word aligned because PPC_BPF_LL()
> + * (BPF_DW case) generates two instructions if 'off' is not
> + * word-aligned and one instruction otherwise.
> + */
> + if (BPF_SIZE(code) == BPF_DW && (off & 3))
> + PPC_JMP((ctx->idx + 3) * 4);
> + else
> + PPC_JMP((ctx->idx + 2) * 4);
> + }
> +
> switch (size) {
> case BPF_B:
> EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
>
next prev parent reply other threads:[~2021-09-29 11:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 11:18 [PATCH v4 0/8] bpf powerpc: Add BPF_PROBE_MEM support in powerpc JIT compiler Hari Bathini
2021-09-29 11:18 ` [PATCH v4 1/8] bpf powerpc: Remove unused SEEN_STACK Hari Bathini
2021-09-29 11:18 ` [PATCH v4 2/8] bpf powerpc: Remove extra_pass from bpf_jit_build_body() Hari Bathini
2021-09-29 11:18 ` [PATCH v4 3/8] bpf powerpc: refactor JIT compiler code Hari Bathini
2021-09-29 11:42 ` Christophe Leroy
2021-09-29 11:18 ` [PATCH v4 4/8] powerpc/ppc-opcode: introduce PPC_RAW_BRANCH() macro Hari Bathini
2021-09-29 11:18 ` [PATCH v4 5/8] bpf ppc64: Add BPF_PROBE_MEM support for JIT Hari Bathini
2021-09-29 11:43 ` Christophe Leroy
2021-09-29 11:47 ` Christophe Leroy
2021-09-30 4:18 ` Jordan Niethe
2021-09-29 11:18 ` [PATCH v4 6/8] bpf ppc64: Access only if addr is kernel address Hari Bathini
2021-09-29 11:44 ` LEROY Christophe [this message]
2021-09-29 11:18 ` [PATCH v4 7/8] bpf ppc32: Add BPF_PROBE_MEM support for JIT Hari Bathini
2021-09-29 11:44 ` Christophe Leroy
2021-09-29 11:18 ` [PATCH v4 8/8] bpf ppc32: Access only if addr is kernel address Hari Bathini
2021-09-29 11:45 ` Christophe Leroy
2023-09-14 6:18 ` Christophe Leroy
2023-09-14 8:23 ` Hari Bathini
2021-09-30 20:57 ` [PATCH v4 0/8] bpf powerpc: Add BPF_PROBE_MEM support in powerpc JIT compiler Daniel Borkmann
2021-10-01 21:22 ` Naveen N. Rao
2021-10-03 22:49 ` Michael Ellerman
2021-10-04 8:05 ` Daniel Borkmann
2021-10-04 8:43 ` Michael Ellerman
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