{"schema_version":"1.9.0","id":"CVE-2023-53029","published":"2025-03-27T16:43:58.234Z","modified":"2026-08-12T03:51:12.573844718Z","related":["SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1195-1","SUSE-SU-2025:1241-1"],"summary":"octeontx2-pf: Fix the use of GFP_KERNEL in atomic context on rt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: Fix the use of GFP_KERNEL in atomic context on rt\n\nThe commit 4af1b64f80fb (\"octeontx2-pf: Fix lmtst ID used in aura\nfree\") uses the get/put_cpu() to protect the usage of percpu pointer\nin ->aura_freeptr() callback, but it also unnecessarily disable the\npreemption for the blockable memory allocation. The commit 87b93b678e95\n(\"octeontx2-pf: Avoid use of GFP_KERNEL in atomic context\") tried to\nfix these sleep inside atomic warnings. But it only fix the one for\nthe non-rt kernel. For the rt kernel, we still get the similar warnings\nlike below.\n  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0\n  preempt_count: 1, expected: 0\n  RCU nest depth: 0, expected: 0\n  3 locks held by swapper/0/1:\n   #0: ffff800009fc5fe8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x24/0x30\n   #1: ffff000100c276c0 (&mbox->lock){+.+.}-{3:3}, at: otx2_init_hw_resources+0x8c/0x3a4\n   #2: ffffffbfef6537e0 (&cpu_rcache->lock){+.+.}-{2:2}, at: alloc_iova_fast+0x1ac/0x2ac\n  Preemption disabled at:\n  [<ffff800008b1908c>] otx2_rq_aura_pool_init+0x14c/0x284\n  CPU: 20 PID: 1 Comm: swapper/0 Tainted: G        W          6.2.0-rc3-rt1-yocto-preempt-rt #1\n  Hardware name: Marvell OcteonTX CN96XX board (DT)\n  Call trace:\n   dump_backtrace.part.0+0xe8/0xf4\n   show_stack+0x20/0x30\n   dump_stack_lvl+0x9c/0xd8\n   dump_stack+0x18/0x34\n   __might_resched+0x188/0x224\n   rt_spin_lock+0x64/0x110\n   alloc_iova_fast+0x1ac/0x2ac\n   iommu_dma_alloc_iova+0xd4/0x110\n   __iommu_dma_map+0x80/0x144\n   iommu_dma_map_page+0xe8/0x260\n   dma_map_page_attrs+0xb4/0xc0\n   __otx2_alloc_rbuf+0x90/0x150\n   otx2_rq_aura_pool_init+0x1c8/0x284\n   otx2_init_hw_resources+0xe4/0x3a4\n   otx2_open+0xf0/0x610\n   __dev_open+0x104/0x224\n   __dev_change_flags+0x1e4/0x274\n   dev_change_flags+0x2c/0x7c\n   ic_open_devs+0x124/0x2f8\n   ip_auto_config+0x180/0x42c\n   do_one_initcall+0x90/0x4dc\n   do_basic_setup+0x10c/0x14c\n   kernel_init_freeable+0x10c/0x13c\n   kernel_init+0x2c/0x140\n   ret_from_fork+0x10/0x20\n\nOf course, we can shuffle the get/put_cpu() to only wrap the invocation\nof ->aura_freeptr() as what commit 87b93b678e95 does. But there are only\ntwo ->aura_freeptr() callbacks, otx2_aura_freeptr() and\ncn10k_aura_freeptr(). There is no usage of perpcu variable in the\notx2_aura_freeptr() at all, so the get/put_cpu() seems redundant to it.\nWe can move the get/put_cpu() into the corresponding callback which\nreally has the percpu variable usage and avoid the sprinkling of\nget/put_cpu() in several 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