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Fri, 14 Feb 2025 12:53:10 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 184CA20043; Fri, 14 Feb 2025 12:53:10 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A6BA720040; Fri, 14 Feb 2025 12:53:05 +0000 (GMT) Received: from li-c439904c-24ed-11b2-a85c-b284a6847472.ibm.com.com (unknown [9.43.125.185]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Feb 2025 12:53:05 +0000 (GMT) From: Madhavan Srinivasan To: Michael Ellerman , Nicholas Piggin , Naveen N Rao , Christophe Leroy Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Erhard Furtner Subject: Re: [PATCH v2] powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC Date: Fri, 14 Feb 2025 18:23:03 +0530 Message-ID: <173953661683.199877.9730863250927440226.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <06621423da339b374f48c0886e3a5db18e896be8.1739342693.git.christophe.leroy@csgroup.eu> References: <06621423da339b374f48c0886e3a5db18e896be8.1739342693.git.christophe.leroy@csgroup.eu> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: RRd7hmEcIPgC1HcBVjzk2ByDOy6x_H5c X-Proofpoint-GUID: OUzYFy5Itgqmw9uNZPi0y7RtKoOzsu1V X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-14_05,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 mlxscore=0 malwarescore=0 phishscore=0 spamscore=0 adultscore=0 mlxlogscore=538 priorityscore=1501 lowpriorityscore=0 bulkscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502140092 On Wed, 12 Feb 2025 07:46:28 +0100, Christophe Leroy wrote: > Erhard reported the following KASAN hit while booting his PowerMac G4 > with a KASAN-enabled kernel 6.13-rc6: > > BUG: KASAN: vmalloc-out-of-bounds in copy_to_kernel_nofault+0xd8/0x1c8 > Write of size 8 at addr f1000000 by task chronyd/1293 > > CPU: 0 UID: 123 PID: 1293 Comm: chronyd Tainted: G W 6.13.0-rc6-PMacG4 #2 > Tainted: [W]=WARN > Hardware name: PowerMac3,6 7455 0x80010303 PowerMac > Call Trace: > [c2437590] [c1631a84] dump_stack_lvl+0x70/0x8c (unreliable) > [c24375b0] [c0504998] print_report+0xdc/0x504 > [c2437610] [c050475c] kasan_report+0xf8/0x108 > [c2437690] [c0505a3c] kasan_check_range+0x24/0x18c > [c24376a0] [c03fb5e4] copy_to_kernel_nofault+0xd8/0x1c8 > [c24376c0] [c004c014] patch_instructions+0x15c/0x16c > [c2437710] [c00731a8] bpf_arch_text_copy+0x60/0x7c > [c2437730] [c0281168] bpf_jit_binary_pack_finalize+0x50/0xac > [c2437750] [c0073cf4] bpf_int_jit_compile+0xb30/0xdec > [c2437880] [c0280394] bpf_prog_select_runtime+0x15c/0x478 > [c24378d0] [c1263428] bpf_prepare_filter+0xbf8/0xc14 > [c2437990] [c12677ec] bpf_prog_create_from_user+0x258/0x2b4 > [c24379d0] [c027111c] do_seccomp+0x3dc/0x1890 > [c2437ac0] [c001d8e0] system_call_exception+0x2dc/0x420 > [c2437f30] [c00281ac] ret_from_syscall+0x0/0x2c > --- interrupt: c00 at 0x5a1274 > NIP: 005a1274 LR: 006a3b3c CTR: 005296c8 > REGS: c2437f40 TRAP: 0c00 Tainted: G W (6.13.0-rc6-PMacG4) > MSR: 0200f932 CR: 24004422 XER: 00000000 > > [...] Applied to powerpc/fixes. [1/1] powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC https://git.kernel.org/powerpc/c/d262a192d38e527faa5984629aabda2e0d1c4f54 Thanks