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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: AM9P192MB0872.EURP192.PROD.OUTLOOK.COM X-Proofpoint-ORIG-GUID: 7kRLN-1mJ65Eh4B1NjMPQtdYt_kIwBW9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzIzMDA4NyBTYWx0ZWRfX11md874uhr1E 2zMRj0iJ4qvfX+CYMhAHvgLEr3Yzuif6c7HqkmuLqx9AE+QNJEicKr5W2xbd5jzqb1qBVR5L/8k cl4eVb/0nRTl7vc1Ziuymlm+Xz1z3859vpq8vSaieRKuU4A+nzqa7+oXDmV6AFke/xpCiOdiw1I 8lHz9j242PsPaoevwa7Sil2UIhXen+mresqBTE+EAB4h4qBR6fFkjD75fiOMP7YkusAi267v+hH eJRCf3j9g/2xsDJX1FZmYexdLh2kCp+g/JAca/K8qMrTWVsRfTWtYixucyAUqL7b4cUiB8Z9bfi eti8p5vwRhkeRyagv+d0urfGNQ1ysXxcsHXljCub/Ol5ut6EfjhR6XOYPMgHrslfhg3aH7Jd7IG Vp6Z1goyGfw7xdGGD2riNNm7q0yXYJnwzufY8UeSztDf/eYfWpkcVfTqMwcDD5wqTz2q+PBLXFC Bac75PB80RstRipHcQA== X-Authority-Analysis: v=2.4 cv=K9Iv3iWI c=1 sm=1 tr=0 ts=69c121e8 cx=c_pps a=f0zd6TNSY3rBIns+TsgepA==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=Yq5XynenixoA:10 a=8gLI3H-aZtYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=tr3XZvuDWTETL0Uaxejn:22 a=WQ4YJ39tjzx_Hbm9pN5v:22 a=AFTvTRuWCIeG-qExZDUA:9 a=CjuIK1q_8ugA:10 a=O8hF6Hzn-FEA:10 X-Proofpoint-GUID: 7kRLN-1mJ65Eh4B1NjMPQtdYt_kIwBW9 On Mon, Mar 23, 2026 at 05:31:03PM +0800, Baochen Qiang wrote: > > > On 3/20/2026 5:52 PM, Alexander Wilhelm wrote: > > Hello ath12k developers, > > > > I have another fix for the big endian platform, but unfortunately the data types > > do not match here, so I need your support. The problem is the following: the > > structs `hal_reo_dest_ring`, `hal_wbm_completion_ring`, and > > `hal_wbm_release_ring_cc_rx` all define the members `buf_va_lo` and `buf_va_hi` > > as `__le32`. At first glance this seems correct, because the entire structure > > contains only little endian fields. The local variable `desc_va` in each > > function (see patch below) is of type `u64`, so it makes sense that I would need > > to convert from little endian to CPU endian. Unfortunately, this leads to the > > following crashes, in `tx_completion` and `rx_process_wbm`, respectivally: > > > > > > Kernel attempted to read user page (40dcdf) - exploit attempt? (uid: 0) > > BUG: Unable to handle kernel data access on read at 0x0040dcdf > > Faulting instruction address: 0xe209290c > > Oops: Kernel access of bad area, sig: 11 [#1] > > BE PAGE_SIZE=4K SMP NR_CPUS=4 CoreNet Generic > > Modules linked in: ath12k(O) mac80211(O) cfg80211(O) compat(O) ... > > CPU: 1 PID: 10200 Comm: jshn Tainted: G O 6.6.73 #0 > > Hardware name: CyBoxAP-A e5500 0x80241021 CoreNet Generic > > NIP: e209290c LR: e2092854 CTR: c08d3190 > > REGS: dffe3d40 TRAP: 0300 Tainted: G O (6.6.73) > > MSR: 00029002 CR: 44004804 XER: 00000000 > > DEAR: 0040dcdf ESR: 00000000 > > GPR00: e2092854 dffe3e30 c328a500 e2092854 0040dcce 00000008 00070000 cf900000 > > GPR08: 00000000 cf900004 40000000 c8e52c4c c08d3190 1002801c 0fcf5000 c0ab85f8 > > GPR16: d0d1f7a0 c12a9080 00000001 df7b7f80 00000003 cf900000 e1bc0000 e1ccb988 > > GPR24: ffffffff c8ed0000 e1cc0220 00000000 c8ec0000 c8ec0000 c8ec0f50 c8ec0000 > > NIP [e209290c] ath12k_dp_tx_completion_handler+0x22c/0x720 [ath12k] > > LR [e2092854] ath12k_dp_tx_completion_handler+0x174/0x720 [ath12k] > > Call Trace: > > [dffe3e30] [e2092854] ath12k_dp_tx_completion_handler+0x174/0x720 [ath12k] (unreliable) > > [dffe3e80] [e208fe18] ath12k_dp_service_srng+0x58/0x380 [ath12k] > > [dffe3ed0] [e20a1490] ath12k_pci_hif_resume+0x520/0x8a0 [ath12k] > > [dffe3f00] [c067404c] __napi_poll+0x4c/0x260 > > [dffe3f30] [c06746f8] net_rx_action+0x188/0x340 > > [dffe3fa0] [c003a3d8] handle_softirqs+0x128/0x280 > > [dffe3ff0] [c00045b0] do_softirq_own_stack+0x30/0x50 > > [d0f2fb70] [00000000] 0x0 > > [d0f2fb90] [c003a7d0] irq_exit+0x70/0xa0 > > [d0f2fba0] [c0000c84] ExternalInput+0x144/0x160 > > --- interrupt: 500 at percpu_counter_add_batch+0x9c/0x150 > > NIP: c0425e8c LR: c01a5964 CTR: c01764e0 > > REGS: d0f2fbb0 TRAP: 0500 Tainted: G O (6.6.73) > > MSR: 00029002 CR: 48008802 XER: 20000000 > > > > GPR00: c01a5a00 d0f2fca0 c328a500 c1db7300 dffc0f20 00000000 fffffffc 00021002 > > GPR08: 1e763000 e1091054 00000007 c12b0530 88002808 1002801c 0fcf5000 c0ab85f8 > > GPR16: d0d1f7a0 dffc0f20 00000000 000003fe 00000000 f92412bd 00000003 c9525480 > > GPR24: d0f2fd74 c8a501f8 c12b0530 00029002 00000007 00000000 0000000b c1db7300 > > NIP [c0425e8c] percpu_counter_add_batch+0x9c/0x150 > > LR [c01a5964] unmap_page_range+0x484/0x820 > > --- interrupt: 500 > > [d0f2fca0] [00000001] 0x1 (unreliable) > > [d0f2fcd0] [c01a5a00] unmap_page_range+0x520/0x820 > > [d0f2fd60] [c01a5d9c] unmap_vmas+0x9c/0xe0 > > [d0f2fda0] [c01afef4] exit_mmap+0xb4/0x2a0 > > [d0f2fe40] [c0031610] mmput+0x40/0x140 > > [d0f2fe60] [c0038df4] do_exit+0x2b4/0x990 > > [d0f2feb0] [c00396c4] do_group_exit+0x34/0xa0 > > [d0f2fed0] [c0039748] sys_exit_group+0x18/0x20 > > [d0f2fee0] [c000dbac] system_call_exception+0xac/0x1f0 > > [d0f2ff00] [c00110e8] ret_from_syscall+0x0/0x28 > > --- interrupt: c00 at 0xfded438 > > NIP: 0fded438 LR: 0ff23958 CTR: 0fd94930 > > REGS: d0f2ff10 TRAP: 0c00 Tainted: G O (6.6.73) > > MSR: 0002f902 CR: 28002402 XER: 20000000 > > > > GPR00: 000000ea bff93390 b0316520 00000000 113e8af0 113e8af0 00000000 00000000 > > GPR08: 00000000 00000000 00000000 ffffffff b02ccb04 1002801c 100a0000 bfbc4260 > > GPR16: 114974b0 00000000 114a4de0 00000000 b02cc900 00000001 00000000 00000001 > > GPR24: 0ff239a0 00000000 00000001 00000000 b030f52c fffff000 0ff23958 00000000 > > NIP [0fded438] 0xfded438 > > LR [0ff23958] 0xff23958 > > --- interrupt: c00 > > Code: 512a421e 2e140000 512a463e 40f20008 555b9f3e 39350004 754a4000 7c804c2c 41c20224 7c87442c 2c040000 41c20230 <88a40011> 7fc3f378 83a40008 8a640010 > > ---[ end trace 0000000000000000 ]--- > > > > Kernel panic - not syncing: Fatal exception > > ---[ end Kernel panic - not syncing: Fatal exception ]--- > > > > > > user@root:~# Kernel attempted to read user page (c011de) - exploit attempt? (uid: 0) > > BUG: Unable to handle kernel data access on read at 0x00c011de > > Faulting instruction address: 0xe1e3dc44 > > Oops: Kernel access of bad area, sig: 11 [#1] > > BE PAGE_SIZE=4K SMP NR_CPUS=4 CoreNet Generic > > Modules linked in: ... > > CPU: 1 PID: 0 Comm: swapper/1 Tainted: G O 6.6.73 #0 > > Hardware name: CyBoxAP-A e5500 0x80241021 CoreNet Generic > > NIP: e1e3dc44 LR: e1e3dc30 CTR: c08d40e0 > > REGS: dffe3ce0 TRAP: 0300 Tainted: G O (6.6.73) > > MSR: 00029002 CR: 44004402 XER: 00000000 > > DEAR: 00c011de ESR: 00000000 > > GPR00: e1e33154 dffe3dd0 c1870000 00000000 cebe0000 00000000 00000000 00c011ce > > GPR08: 00000001 00000000 00020000 c30a294c c08d40e0 00000000 00000001 00000000 > > GPR16: e1ce2668 c9270000 c9269a18 c92664d0 e1ce26dc 00000000 babababa dffe3df4 > > GPR24: 00000040 00000000 c9266480 dffe3dec dffe3e04 c9260000 00c011ce c9269a18 > > NIP [e1e3dc44] ath12k_dp_rx_process_wbm_err+0x124/0x600 [ath12k] > > LR [e1e3dc30] ath12k_dp_rx_process_wbm_err+0x110/0x600 [ath12k] > > Call Trace: > > [dffe3dd0] [c0ab8e30] 0xc0ab8e30 (unreliable) > > [dffe3e80] [e1e33154] ath12k_dp_service_srng+0x314/0x380 [ath12k] > > [dffe3ed0] [e1e44540] ath12k_pci_hif_resume+0x520/0x8a0 [ath12k] > > [dffe3f00] [c0674c7c] __napi_poll+0x4c/0x260 > > [dffe3f30] [c0675328] net_rx_action+0x188/0x340 > > [dffe3fa0] [c003a3d8] handle_softirqs+0x128/0x280 > > [dffe3ff0] [c00045b0] do_softirq_own_stack+0x30/0x50 > > [c18c7e10] [c12b040c] 0xc12b040c > > [c18c7e30] [c003a7d0] irq_exit+0x70/0xa0 > > [c18c7e40] [c0000c84] ExternalInput+0x144/0x160 > > --- interrupt: 500 at arch_cpu_idle+0x24/0x50 > > NIP: c00071f4 LR: c00071f4 CTR: c000fe14 > > REGS: c18c7e50 TRAP: 0500 Tainted: G O (6.6.73) > > MSR: 0002b002 CR: 84000402 XER: 00000000 > > > > GPR00: c08cc978 c18c7f40 c1870000 00000005 00000001 40000000 c328becc c12b0530 > > GPR08: c12b0530 c000fe14 0098ca91 00154674 24000402 00000000 00000001 00000000 > > GPR16: 00000000 00000000 c00119a0 dffee5f0 00000001 00000000 ffffffff c1050254 > > GPR24: c12c0000 c0011970 c0011940 c12d0000 00000004 c12b040c c12b0000 00000001 > > NIP [c00071f4] arch_cpu_idle+0x24/0x50 > > LR [c00071f4] arch_cpu_idle+0x24/0x50 > > --- interrupt: 500 > > [c18c7f40] [c0a367e0] 0xc0a367e0 (unreliable) > > [c18c7f50] [c08cc978] default_idle_call+0x38/0x58 > > [c18c7f60] [c007b3b0] do_idle+0xf0/0x130 > > [c18c7f80] [c007b580] cpu_startup_entry+0x30/0x40 > > [c18c7fa0] [c001325c] start_secondary+0x48c/0x930 > > [c18c7ff0] [c0002870] __secondary_start+0x90/0xdc > > Code: 7fa3eb78 4bfcba59 7c641b79 41c20144 38a10044 7fa3eb78 4bfcdb85 7c651b79 40c2026c 83c10058 2c1e0000 41c202d0 <813e0010> 7c09b000 41c20010 7e84a378 > > ---[ end trace 0000000000000000 ]--- > > > > Kernel panic - not syncing: Fatal exception > > ---[ end Kernel panic - not syncing: Fatal exception ]--- > > > > > > My fix, as shown in the patch below, is to remove the conversion. But then the > > member variables `buf_va_lo` and `buf_va_hi` must be `u32`, which is obviously > > wrong. Alternatively, `desc_va` must be `__le64`, but that is likely also > > incorrect, because the address is simply dereferenced, and this clearly requires > > CPU endianness. What I also do not fully understand is who actually fills these > > addresses and at which stage this happens. I hope you can help clarify this so > > that I can provide a correct patch for this issue afterward. > > > > > > hmm, i am not sure here, but can you please try > > diff --git a/drivers/net/wireless/ath/ath12k/dp.c b/drivers/net/wireless/ath/ath12k/dp.c > index 1c82d927d27b..f142759a217b 100644 > --- a/drivers/net/wireless/ath/ath12k/dp.c > +++ b/drivers/net/wireless/ath/ath12k/dp.c > @@ -1246,7 +1246,7 @@ static int ath12k_dp_cc_desc_init(struct ath12k_base *ab) > > /* Update descriptor VA in SPT */ > rx_desc_addr = ath12k_dp_cc_get_desc_addr_ptr(dp, ppt_idx, j); > - *rx_desc_addr = &rx_descs[j]; > + *rx_desc_addr = (struct ath12k_rx_desc_info > *)cpu_to_le64(&rx_descs[j]); > } > } > > @@ -1286,7 +1286,7 @@ static int ath12k_dp_cc_desc_init(struct ath12k_base *ab) > /* Update descriptor VA in SPT */ > tx_desc_addr = > ath12k_dp_cc_get_desc_addr_ptr(dp, ppt_idx, j); > - *tx_desc_addr = &tx_descs[j]; > + *tx_desc_addr = (struct ath12k_tx_desc_info > *)cpu_to_le64(&tx_descs[j]); > } > } > spin_unlock_bh(&dp->tx_desc_lock[pool_id]); > Hi Baochen, It actually worked, although the solution isn't entirely clean. Sparse consequently complains with: dp.c:1249:42: warning: cast from restricted __le64 dp.c:1289:50: warning: cast from restricted __le64 To be honest, I also don't quite understand why the struct pointer has to be in little endian at this point. The function `ath12k_dp_cc_get_desc_addr_ptr` returns an offset from the `vaddr` inside the `spt_info` struct, stored as a `u64`. But dereferencing it suddenly treats it as little endian. Shouldn't `vaddr` itself perhaps be a `__le64`? Best regards Alexander Wilhelm