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Mon, 17 Aug 2026 20:16:10 +0000 (GMT) Received: from IBM-D32RQW3.ibm.com (unknown [9.61.244.120]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Mon, 17 Aug 2026 20:16:09 +0000 (GMT) From: Farhan Ali To: stable@vger.kernel.org, gregkh@linuxfoundation.org, sashal@kernel.org Cc: alifm@linux.ibm.com, Jason Gunthorpe , Kevin Tian , Eric Auger , Nicolin Chen , Yi Liu , Lixiao Yang , Matthew Rosato Subject: [PATCH v3 1/5] kernel/user: Allow user_struct::locked_vm to be usable for iommufd Date: Mon, 17 Aug 2026 13:16:02 -0700 Message-ID: <20260817201606.3194-2-alifm@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260817201606.3194-1-alifm@linux.ibm.com> References: <20260817201606.3194-1-alifm@linux.ibm.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: EOEI-p-U6oCuMe36_mtYQHvhBMdCUQUb X-Authority-Analysis: v=2.4 cv=NLLlPU6g c=1 sm=1 tr=0 ts=6a836c0d cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=Ikd4Dj_1AAAA:8 a=QyXUC8HyAAAA:8 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=-gLlHuE2PaxnPGtbEqgA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE3MDE1MyBTYWx0ZWRfXytl+k3ZAilYS Iix88umjPEDqv7aoR/llhujDLl+TAm6W/TrtRdp47wc0EywpLG4ZjyJlq+DR8w5hKOo46uJFway MKHigplhN4vvAKeb4blNeXyc4ITdwrk= X-Proofpoint-ORIG-GUID: EOEI-p-U6oCuMe36_mtYQHvhBMdCUQUb X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE3MDE1MyBTYWx0ZWRfX2NyOZAVCOZfs yJsRpXSjENEwIixFLATCReiiHyB4uJda2IPERo5dP0qs0X95tixO3surQF6AtB/5KkHkW4RQDeu b0ae2i/3JIg36klDMAfmPxT3Vi7Cg6qmIgf1V/rXPnHhniVIcTTVJKowk+QOTprOPyjTvui3Qm9 RX3LSu/5ipiYnSQnh5Hp6ivGaiiskrySzNT040h70RuOzt1dFn5ZGUEF8s4rj9MCQ6l0sXoH3Ms xCpParMXjFNs6stAPXll/26L8E8uynvoKBVtRnlmaAU+cXt3Vx5RUfRvRxdaUYmMWilGtlcFbiI +60aYjkf1+5NYglO/KBlgkjc7sdsJJXJq7jHsaU/w5MrEUpNLUB8G9Ajj3JEZf2ouCB3WbFgSGd 4Sf+HQEVoHkMuBS2rTaAOlIzRJZeTTy0l9BDem6x2gAjmAg2FLY1/pKC8U+mPPFktZ//jSK//3X yR8FAtPNpj/xIpRVhYw== 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=2026-08-17_03,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608170153 From: Jason Gunthorpe Following the pattern of io_uring, perf, skb, and bpf, iommfd will use user->locked_vm for accounting pinned pages. Ensure the value is included in the struct and export free_uid() as iommufd is modular. user->locked_vm is the good accounting to use for ulimit because it is per-user, and the security sandboxing of locked pages is not supposed to be per-process. Other places (vfio, vdpa and infiniband) have used mm->pinned_vm and/or mm->locked_vm for accounting pinned pages, but this is only per-process and inconsistent with the new FOLL_LONGTERM users in the kernel. Concurrent work is underway to try to put this in a cgroup, so everything can be consistent and the kernel can provide a FOLL_LONGTERM limit that actually provides security. Link: https://lore.kernel.org/r/7-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com Reviewed-by: Kevin Tian Reviewed-by: Eric Auger Tested-by: Nicolin Chen Tested-by: Yi Liu Tested-by: Lixiao Yang Tested-by: Matthew Rosato Signed-off-by: Jason Gunthorpe (cherry picked from commit ce5a23c835aa0f0a931b5bcde1e7811f951b0146) Signed-off-by: Farhan Ali --- include/linux/sched/user.h | 2 +- kernel/user.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h index f054d0360a75..4cc52698e214 100644 --- a/include/linux/sched/user.h +++ b/include/linux/sched/user.h @@ -25,7 +25,7 @@ struct user_struct { #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \ - defined(CONFIG_VFIO_PCI_ZDEV_KVM) + defined(CONFIG_VFIO_PCI_ZDEV_KVM) || IS_ENABLED(CONFIG_IOMMUFD) atomic_long_t locked_vm; #endif #ifdef CONFIG_WATCH_QUEUE diff --git a/kernel/user.c b/kernel/user.c index e2cf8c22b539..d667debeafd6 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -185,6 +185,7 @@ void free_uid(struct user_struct *up) if (refcount_dec_and_lock_irqsave(&up->__count, &uidhash_lock, &flags)) free_user(up, flags); } +EXPORT_SYMBOL_GPL(free_uid); struct user_struct *alloc_uid(kuid_t uid) { -- 2.43.0