Description
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Improve page fault error reporting If IOMMU domain for device group is not setup properly then we may hit IOMMU page fault. Current page fault handler assumes that domain is always setup and it will hit NULL pointer derefence (see below sample log). Lets check whether domain is setup or not and log appropriate message. Sample log: ---------- amdgpu 0000:00:01.0: amdgpu: SE 1, SH per SE 1, CU per SH 8, active_cu_number 6 BUG: kernel NULL pointer dereference, address: 0000000000000058 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 2 PID: 56 Comm: irq/24-AMD-Vi Not tainted 6.2.0-rc2+ #89 Hardware name: xxx RIP: 0010:report_iommu_fault+0x11/0x90 [...] Call Trace: <TASK> amd_iommu_int_thread+0x60c/0x760 ? __pfx_irq_thread_fn+0x10/0x10 irq_thread_fn+0x1f/0x60 irq_thread+0xea/0x1a0 ? preempt_count_add+0x6a/0xa0 ? __pfx_irq_thread_dtor+0x10/0x10 ? __pfx_irq_thread+0x10/0x10 kthread+0xe9/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 </TASK> [joro: Edit commit message]
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before be8301e2d5a8b95c04ae8e35d7bfee7b0f03f83a
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 446080b353f048b1fddaec1434cb3d27b5de7efe
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 996d120b4de2b0d6b592bd9fbbe6e244b81ab3cc
6.1.16 (semver)
6.2.3 (semver)
6.3 (original_commit_for_fix)
References
git.kernel.org/...c/be8301e2d5a8b95c04ae8e35d7bfee7b0f03f83a
git.kernel.org/...c/446080b353f048b1fddaec1434cb3d27b5de7efe
git.kernel.org/...c/996d120b4de2b0d6b592bd9fbbe6e244b81ab3cc
