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Mon, 28 Sep 2026 11:37:14 +0000 (GMT) Received: from localhost.localdomain (unknown [9.124.213.32]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 28 Sep 2026 11:37:14 +0000 (GMT) From: Amit Machhiwal To: Madhavan Srinivasan , linuxppc-dev@lists.ozlabs.org Cc: Amit Machhiwal , Nicholas Piggin , Michael Ellerman , "Christophe Leroy (CS GROUP)" , "Ritesh Harjani (IBM)" , Shrikanth Hegde , kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Gautam Menghani , Harsh Prateek Bora , R Nageswara Sastry , Alexander Graf , linux-hardening@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 1/3] KVM: PPC: Book3S HV: Add SRCU protection for virtual-mode HPT hcalls Date: Mon, 28 Sep 2026 17:07:01 +0530 Message-ID: <20260928113704.48912-1-amachhiw@linux.ibm.com> X-Mailer: git-send-email 2.54.0 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-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI4MDA0NiBTYWx0ZWRfX2ZuAdkI5Ussw LRCIBD3UqcTIaz2FA3M4OkX1tJh7W9teybSIPXr5h+iGDBNZTMVZmQkA3taJbjQ3/Wb5gmM+dwg GY/eidcPBCV5pqJaWBvassE74mdblkYY6WyJZBzqv8xDdYa+p3rPVsYW68Kn5Mu5bm6qVx6RUwe LDW5Gyy89bfv632cZLYyXjrzfjMlbJsFmuc865277aWnlcVDmbGiqamSSJ7/Oal5QkZS44tXLZv dJgrxj5sFBPIOXeBO9QrmH0IebbG4rgzZa0luNCEBRfflfuiXoKMAHGT8cE+ge+Ay5I8HbxK1ly rM8dyaSiyAE2+D5RMU5mQh2lJpgxNe9RWK4DwensoMXPi5XL32RDwpgb3iEriU1kxcbSWpmlrNn nnRdjiHBYWVPbtpCAS5MCVguFZ3l7eLGljPoNeObwgowNQiiWP0Ikr6oh+Q2y+mOCjnezacwDPN 9U1Qc0+vzbAb5LI32pA== X-Authority-Analysis: v=2.4 cv=SPbXx+vH c=1 sm=1 tr=0 ts=6aba5173 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=DgxhUou5BkHipWTGidQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: EzQiaEYNpTDL5GYT4jphrLfaa_tpmb1h X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI4MDA0NiBTYWx0ZWRfX+yC0UJb1l+QX 8nvjN9+ELBH3xiJK3llmn5/l8R7nL8u18YxS47DgtRKjS19rwnm8wK7z7IYZ1z9nUMVnuHZD2pU NMBjE6sNWsQWX+cq7cdjR/gYnPmTcXU= X-Proofpoint-GUID: 431P1MB3VSeFlb-OZeLTUlNfY4df4jFw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-28_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1011 spamscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 bulkscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609280046 The virtual-mode HPT hcall handlers (H_ENTER, H_REMOVE, H_BULK_REMOVE, H_CLEAR_REF, H_CLEAR_MOD) call into book3s_hv_rm_mmu.c, which accesses memslots via kvm_memslots_raw(). kvm_memslots_raw() uses rcu_dereference_raw_check() to bypass SRCU lockdep annotation checking. This is safe in real mode because the entire guest entry/exit is wrapped in srcu_read_lock/unlock inside kvmppc_run_core() and kvmhv_run_single_vcpu(). However, since commit 6165d5dd99db ("KVM: PPC: Book3S HV: add virtual mode handlers for HPT hcalls and page faults"), these same handlers are also executed in virtual mode via kvmppc_pseries_do_hcall(), which runs after SRCU has already been released on guest exit. A concurrent KVM_SET_USER_MEMORY_REGION deletion or move can therefore call synchronize_srcu_expedited() — which does not wait for this thread — and then kfree(slot) and vfree(slot->arch.rmap) while the hcall handler still holds a raw pointer to the memslot. lock_rmap() then writes to freed vmalloc memory, leading to use-after-free and memory corruption. Because kvm_memslots_raw() suppresses lockdep checks, this race is entirely silent. Fix this by factoring out the 7 HPT hcall handlers (H_REMOVE, H_ENTER, H_READ, H_CLEAR_MOD, H_CLEAR_REF, H_PROTECT, H_BULK_REMOVE) into a helper function, kvmppc_pseries_do_hpt_hcall(), and wrapping its call site in srcu_read_lock(&kvm->srcu) / srcu_read_unlock(&kvm->srcu, idx). Targeting only the HPT hcalls avoids wrapping non-HPT hcalls that sleep (such as H_CONFER, H_REGISTER_VPA, H_PAGE_INIT) or handlers that already acquire SRCU internally (such as H_RTAS). Fixes: 6165d5dd99db ("KVM: PPC: Book3S HV: add virtual mode handlers for HPT hcalls and page faults") Cc: stable@vger.kernel.org # v5.14+ Suggested-by: Ritesh Harjani (IBM) Signed-off-by: Amit Machhiwal --- arch/powerpc/kvm/book3s_hv.c | 70 ++++++++++++++++++------------------ 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index dbac3573b2c8..aa51968e206a 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1159,6 +1159,38 @@ static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, return H_SUCCESS; } +static long kvmppc_pseries_do_hpt_hcall(struct kvm_vcpu *vcpu, unsigned long req) +{ + switch (req) { + case H_REMOVE: + return kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + case H_ENTER: + return kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + case H_READ: + return kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + case H_CLEAR_MOD: + return kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + case H_CLEAR_REF: + return kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + case H_PROTECT: + return kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + case H_BULK_REMOVE: + return kvmppc_h_bulk_remove(vcpu); + } + + return H_FUNCTION; +} + int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) { struct kvm *kvm = vcpu->kvm; @@ -1174,47 +1206,15 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) switch (req) { case H_REMOVE: - ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5), - kvmppc_get_gpr(vcpu, 6)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_ENTER: - ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5), - kvmppc_get_gpr(vcpu, 6), - kvmppc_get_gpr(vcpu, 7)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_READ: - ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_CLEAR_MOD: - ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_CLEAR_REF: - ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_PROTECT: - ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), - kvmppc_get_gpr(vcpu, 5), - kvmppc_get_gpr(vcpu, 6)); - if (ret == H_TOO_HARD) - return RESUME_HOST; - break; case H_BULK_REMOVE: - ret = kvmppc_h_bulk_remove(vcpu); + idx = srcu_read_lock(&kvm->srcu); + ret = kvmppc_pseries_do_hpt_hcall(vcpu, req); + srcu_read_unlock(&kvm->srcu, idx); if (ret == H_TOO_HARD) return RESUME_HOST; break; -- 2.54.0 (Apple Git-157)