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[153.246.134.248]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7f4c54812aesm4306150b3a.65.2025.12.11.22.56.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Dec 2025 22:56:03 -0800 (PST) Received: from jgg by jggl with local (Exim 4.95) (envelope-from ) id 1vTx4L-0002Bn-3Q; Fri, 12 Dec 2025 02:56:01 -0400 Date: Fri, 12 Dec 2025 02:56:01 -0400 From: Jason Gunthorpe To: Yi Liu Cc: syzbot , iommu@lists.linux.dev, joro@8bytes.org, kevin.tian@intel.com, linux-kernel@vger.kernel.org, robin.murphy@arm.com, syzkaller-bugs@googlegroups.com, will@kernel.org Subject: Re: [syzbot] [iommu?] WARNING in iopt_map_pages (3) Message-ID: References: <69368129.a70a0220.38f243.008f.GAE@google.com> <695e0955-0de4-4059-aa77-66c54669f1a6@intel.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <695e0955-0de4-4059-aa77-66c54669f1a6@intel.com> On Tue, Dec 09, 2025 at 07:57:06PM +0800, Yi Liu wrote: > It looks to be an overflow error as user gives the below arg. But > this should be expected. no? > > // start: int64 = 0x1000005 (8 bytes) > // length: int64 = 0xffffffffffefffff (8 bytes) Something probably overflowed, the test is: r0 = openat$iommufd(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0) ioctl$IOMMU_IOAS_ALLOC(r0, 0x3b81, &(0x7f0000000100)={0xc, 0x0, 0x0}) ioctl$IOMMU_TEST_OP_ADD_RESERVED(r0, 0x3ba0, &(0x7f0000000040)={0x48, 0x1, r1, 0x0, 0x1000005, 0xffffffffffefffff}) ioctl$IOMMU_TEST_OP_MOCK_DOMAIN_FLAGS(r0, 0x3ba0, &(0x7f00000003c0)={0x48, 0x2, r1}) ioctl$IOMMU_IOAS_MAP$PAGES(r0, 0x3b85, &(0x7f0000001340)={0x28, 0x2, r1, 0x0, &(0x7f00003bd000/0x3000)=nil, 0x3000, 0x80}) And I'm guessing the allocator picked something that failed the reserved range intersection path: /* No reserved IOVA intersects the range */ if (iopt_reserved_iter_first(iopt, iova, last)) return -EINVAL; Maybe due to a corrupted range or something. I'll look next week Jason