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Thu, 12 Oct 2023 20:03:19 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v6 3/5] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack Date: Fri, 13 Oct 2023 01:33:08 +0530 Message-ID: <20231012200310.235137-4-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231012200310.235137-1-hbathini@linux.ibm.com> References: <20231012200310.235137-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: YYi2CCBh1V_T-lziTgxrxalJ6xOxxPkW X-Proofpoint-ORIG-GUID: YYi2CCBh1V_T-lziTgxrxalJ6xOxxPkW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-12_12,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 malwarescore=0 mlxlogscore=933 adultscore=0 spamscore=0 bulkscore=0 impostorscore=0 phishscore=0 clxscore=1015 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310120167 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Daniel Borkmann , Alexei Starovoitov , Andrii Nakryiko , Song Liu , "Naveen N. Rao" Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Implement bpf_arch_text_invalidate and use it to fill unused part of the bpf_prog_pack with trap instructions when a BPF program is freed. Signed-off-by: Hari Bathini Acked-by: Song Liu --- arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index c740eac8d584..ecd7cffbbe28 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -292,3 +292,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return err ? ERR_PTR(err) : dst; } + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 insn = BREAKPOINT_INSTRUCTION; + int ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = patch_instructions(dst, &insn, len, true); + mutex_unlock(&text_mutex); + + return ret; +}