On 10/17/24 21:00, Linus Walleij wrote:
On Thu, Oct 17, 2024 at 4:22 PM Clement LE GOFFIC clement.legoffic@foss.st.com wrote:
On 10/17/24 14:59, Linus Walleij wrote:
[...]
+static unsigned long arm_kasan_mem_to_shadow(unsigned long addr) +{
return (unsigned long)kasan_mem_to_shadow((void *)addr);+}
`kasan_mem_to_shadow` function symbol is only exported with : CONFIG_KASAN_GENERIC or defined(CONFIG_KASAN_SW_TAGS) from kasan.h
To me, the if condition you added below should be expanded with those two macros.
(...)
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {Let's check this with the KASAN authors, I think looking for CONFIG_KASAN_VMALLOC should be enough as it is inside the if KASAN clause in lib/Kconfig.kasan, i.e. the symbol KASAN must be enabled for CONFIG_KASAN_VMALLOC to be enabled, and if KASAN is enabled then either KASAN_GENERIC or KASAN_SW_TAGS is enabled (the third option KASAN_HW_TAGS, also known as memory tagging is only available on ARM64 and we are not ARM64.)
But I might be wrong! Kconfig regularly bites me in the foot...
Yours, Linus Walleij
Hi Linus,
I saw your email about Melon's patch targeting the same subject. If we don't enable KASAN either you patch or Melon's one do not compile.
[...] + if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) [...]
Should be replaced with an #ifdef directive. `kasan_mem_to_shadow` symbol is hiden behind :
include/linux/kasan.h:32:#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
So symbol doesn't exist without KASAN enabled.
I don't know how to submit a comment on Melon's patch inside Russel's website.
No issue with KASAN enabled so I did some tests with your serie on a stm32mp157f-dk2 board and qemu. I only get an issue on my board while testing with an ext4 fs on a sdcard and I'm unable to reproduce it with qemu.
Perhaps not related with this topic but as in the backtrace I am getting some keyword from our start exchange, I dump the crash below. If this backtrace is somehow related with our issue, please have a look.
[ 1439.267852] 8<--- cut here --- [ 1439.269570] Unable to handle kernel paging request at virtual address 809b8480 when read [ 1439.277631] [809b8480] *pgd=00000000 [ 1439.281287] Internal error: Oops: 5 [#1] PREEMPT SMP ARM [ 1439.286534] Modules linked in: aes_arm aes_generic cmac algif_hash algif_skcipher af_alg stm32_adc stm32_timer_trigger stm32_lptimer_trigger snd_soc_stm32_sai_sub snd_soc_audio_graph_card snd_soc_simple_card_utils usb_f_ncm stusb160x u_ether brcmfmac_wcc typec hci_uart btbcm stm32_hash stm32_cryp crypto_engine snd_soc_cs42l51_i2c libdes snd_soc_stm32_i2s snd_soc_cs42l51 brcmfmac snd_soc_hdmi_codec bluetooth brcmutil stm32_vrefbuf snd_soc_core libcomposite stm32_adc_core snd_pcm_dmaengine ac97_bus snd_pcm cfg80211 snd_timer snd_soc_stm32_sai ecdh_generic ecc snd libaes stm32_cec soundcore stm32_ddr_pmu stm32_crc32 [ 1439.340928] CPU: 0 PID: 20797 Comm: grep Not tainted 6.6.48 #1 [ 1439.346767] Hardware name: STM32 (Device Tree Support) [ 1439.351945] PC is at __read_once_word_nocheck+0x0/0x8 [ 1439.356965] LR is at unwind_exec_insn+0x364/0x658 [ 1439.361662] pc : [<c011369c>] lr : [<c0113bb0>] psr: 600f0193 [ 1439.367953] sp : de803358 ip : c20584b8 fp : bad0067c [ 1439.373135] r10: de80344c r9 : 0000000b r8 : de80342c [ 1439.378416] r7 : 00000009 r6 : c20584b8 r5 : 809b8480 r4 : de803400 [ 1439.384911] r3 : 00000007 r2 : 00000000 r1 : 00000000 r0 : 809b8480 [ 1439.391405] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none [ 1439.398717] Control: 10c5387d Table: c222c06a DAC: 00000051 [ 1439.404398] Register r0 information: non-paged memory [ 1439.409505] Register r1 information: NULL pointer [ 1439.414197] Register r2 information: NULL pointer [ 1439.418888] Register r3 information: non-paged memory [ 1439.423881] Register r4 information: 4-page vmalloc region starting at 0xde800000 allocated at start_kernel+0x1a8/0x334 [ 1439.434669] Register r5 information: non-paged memory [ 1439.439764] Register r6 information: non-slab/vmalloc memory [ 1439.445466] Register r7 information: non-paged memory [ 1439.450459] Register r8 information: 4-page vmalloc region starting at 0xde800000 allocated at start_kernel+0x1a8/0x334 [ 1439.461236] Register r9 information: non-paged memory [ 1439.466330] Register r10 information: 4-page vmalloc region starting at 0xde800000 allocated at start_kernel+0x1a8/0x334 [ 1439.477207] Register r11 information: non-paged memory [ 1439.482302] Register r12 information: non-slab/vmalloc memory [ 1439.488103] Process grep (pid: 20797, stack limit = 0xd736559a) [ 1439.494000] Stack: (0xde803358 to 0xde804000) [ 1439.498385] 3340: de803480 c01137f0 [ 1439.506512] 3360: c0100ff4 df113fb0 de803448 00000000 bad00678 809b8480 de8034a0 de8034c8 [ 1439.514739] 3380: 00000001 809b8480 de803400 c1241d90 bad0067c c0114114 00004e20 de8034b0 [ 1439.522966] 33a0: de8034d4 de8034cc de803400 809b8480 c1241da8 c1241da8 809b8480 de8034d0 [ 1439.531093] 33c0: 41b58ab3 c194f7f4 c0113ea4 c5349bc0 da2ee5c0 da2ee604 dd811334 c034a6e4 [ 1439.539318] 33e0: 41b58ab3 c194f7f4 c0113ea4 00000000 00000000 00000000 00000000 00000000 [ 1439.547440] 3400: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.555664] 3420: 00000000 00000000 00000000 809b8480 00000000 809b8480 c1241da8 00000000 [ 1439.563887] 3440: c1ae9dc8 809bc000 00000000 00000000 00000000 00000003 00000000 c2047e40 [ 1439.572011] 3460: 00000003 bad0069c 000002c2 00000000 c2048988 00000003 c2047e40 8bf8f8ba [ 1439.580238] 3480: de803500 c01f5200 de803500 00000000 c3020900 00000001 00000000 faacd85f [ 1439.588363] 34a0: de8034cc c01f5200 de803520 00000000 c3020900 00000001 00000000 de803720 [ 1439.596591] 34c0: de8034ec c010ed7c 809b8480 de803abc c1241da8 c1241da8 de803ab8 faacd85f [ 1439.604818] 34e0: de803560 bad006a0 c207c280 c01f539c 00000000 bad006a8 de8035a0 c01f52c4 [ 1439.612944] 3500: 41b58ab3 c195e47c c01f530c de803560 00000001 00000000 de803700 c01736fc [ 1439.621169] 3520: de803580 00000040 00000000 00000011 00000000 d0c85340 00000000 de8036a0 [ 1439.629296] 3540: bad006b4 c01f0328 d0b58f00 c1c06cc0 de8036a0 c07aa568 da2eae80 0000281e [ 1439.637521] 3560: 00000005 bad006b4 de803600 faacd85f 00000000 00000001 00000001 c036bcb8 [ 1439.645649] 3580: c036bcb8 c036d268 c015f29c c01803e4 c01fceb4 c0218570 c0218bd0 c01fe05c [ 1439.653876] 35a0: c01ffe5c c0eb80d8 c01bd890 c01b463c c01012c4 c12a6bc4 c0100bc8 c0113850 [ 1439.662098] 35c0: c1241da8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.670219] 35e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.678441] 3600: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.686563] 3620: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.694786] 3640: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.703008] 3660: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1439.711134] 3680: 00000001 c5419b40 dd805360 c036d268 c5419904 c54199dc bad006d8 c5419280 [ 1439.719360] 36a0: 00000001 c015f29c c65e7f00 1b0aeebb 0000014f c0e463fc d07d3800 faacd85f [ 1439.727586] 36c0: 41b58ab3 c1955000 c015f20c 00000000 c0e46390 c01a28b0 0000014f c5419580 [ 1439.735711] 36e0: 00000000 c195849c c01a282c c5419280 da2eae40 00000000 0016e360 00000000 [ 1439.743937] 3700: 00000000 c01fd6f0 c5419280 da2eae40 da2eae80 da2eae40 c5419288 00000000 [ 1439.752063] 3720: 00000000 c01850f0 1b0aeebb faacd85f c1b8be40 da2eae40 c1b8be40 00000000 [ 1439.760289] 3740: c1c07144 c5419280 00000000 c1c07144 de803794 c01803e4 00000000 00000000 [ 1439.768414] 3760: da2eb640 00000000 c207dac0 c1a3750c 1875f000 da2e3940 bad006f4 ffffffae [ 1439.776640] 3780: 00000000 c5419280 fffffff7 de803800 00000000 c01fceb4 bad006f8 c1b8be40 [ 1439.784866] 37a0: 41b58ab3 c195ea00 c01fcd90 c1b8be40 00000000 00000000 c01362fc c1241da8 [ 1439.792992] 37c0: 41b58ab3 c1956708 c017f024 c01736fc 00000000 00000000 00000000 c01728b0 [ 1439.801219] 37e0: 00000000 c1c05d80 c20925e0 c5419280 c20925e0 1b2d5580 da2e4a80 faacd85f [ 1439.809344] 3800: c1c05d80 da2e4da0 c1c06e40 00000000 0000014f 1a952e8f da2e4a40 da2e4da0 [ 1439.817571] 3820: de803a30 de803a30 da2e4da0 1a952e8f da2e4a40 da2e4db0 da2e4a80 c0218570 [ 1439.825698] 3840: 0000014f da2e4db0 de803a30 c0218bd0 600f0193 da2e4a40 c0218b70 da2e4a90 [ 1439.833925] 3860: da2e4a40 00000000 da2e4a40 c01fe05c da2e4a8c da2e4dd8 de803920 da2e4a98 [ 1439.842151] 3880: 00000050 c5419280 da2e4a94 00000006 de8039e8 1a94faa3 0000014f bad00718 [ 1439.850277] 38a0: 41b58ab3 c195f258 c01fdd98 c01b5444 60010193 c02024c8 c66e23cc 0000014f [ 1439.858504] 38c0: 41b58ab3 c195f258 c01fdd98 0000014f 00000000 1875f000 da2ee000 00023f1b [ 1439.866630] 38e0: 1a94faa3 0000014f 7fffffff da2e4a68 da2ee000 00000000 0000014f 1a94bf00 [ 1439.874857] 3900: 1875f000 7fffffff da2e4a50 c020540c 05fd815f 1a94bf00 da2e4b18 faacd85f [ 1439.883084] 3920: da2e4b18 da2e4a40 1a94faa3 0000014f 600f0193 ffffffff 7fffffff da2e4a50 [ 1439.891212] 3940: da2e4b90 c01ffe5c 600f0193 0000000f da2e4b68 da2e4a60 da2e4af0 da2e4b18 [ 1439.899438] 3960: 00000003 da2e4a70 da2e4b68 da2e4ac8 da2e4a4c da2e4bb8 da2e4b70 da2e4bc0 [ 1439.907565] 3980: 1a94faa3 0000014f 0000001a da2ee000 c0eb80a4 c146d9e0 c30c3c00 c30b7428 [ 1439.915791] 39a0: 0000001a 1875f000 de8039b8 c0eb80d8 c30b7400 c01bd890 c30b7400 c02b9c30 [ 1439.923918] 39c0: c1b8aab0 c30b7400 c5419280 c1b8aab0 c1c07538 c1dbae00 de80e000 de80e00c [ 1439.932145] 39e0: bad0075c c01b463c 0000001b 0000001b c1b8aab0 c01012c4 c1b8ba74 de8039f8 [ 1439.940373] 3a00: de803a30 00000000 200f0013 ffffffff de803a64 e5333f40 c5419280 c1241d90 [ 1439.948498] 3a20: bad0075c c12a6bc4 c0113850 c0100bc8 de803b00 00000000 00000001 000000c0 [ 1439.956725] 3a40: e5333f40 de803ba0 de803bd0 00000001 e5333f40 de803b00 c1241d90 bad0075c [ 1439.964851] 3a60: c20584b8 de803a7c c0114114 c0113850 200f0013 ffffffff 00000051 e5333f40 [ 1439.973078] 3a80: de803ba0 de803bd0 00000001 e5333f40 de803b00 c1241d90 bad0075c c0114114 [ 1439.981305] 3aa0: de803ae0 00000001 de803bdc de803bd4 de803b00 809b8480 c1241da8 c1241da8 [ 1439.989432] 3ac0: e5333f40 de803bd8 c0113ea4 c07aa5e8 da2eae80 b778d32a ffffffff bad00760 [ 1439.997656] 3ae0: 41b58ab3 c194f7f4 c0113ea4 00000000 00000000 00000000 00000000 00000000 [ 1440.005778] 3b00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.014002] 3b20: 00000000 00000000 00000000 e5333f40 00000000 e5333f40 c1241da8 00000000 [ 1440.022127] 3b40: c1ae9dc4 e5334000 00000000 00000000 00000001 00000001 c015f29c c01803e4 [ 1440.030354] 3b60: c01fceb4 c0218570 c0218bd0 c01fe05c c01ffe5c c0eb80d8 c01bd890 891bf569 [ 1440.038580] 3b80: c01012c4 c01f5200 de803c00 891bf569 00000000 faacd85f de803c20 c01f5200 [ 1440.046705] 3ba0: de803c20 faacd85f 00000000 c01f5200 de803c20 00000000 00000000 c01d8bb4 [ 1440.054932] 3bc0: c62ff600 c1253858 de803bf4 c010ed7c e5333f40 de804000 c1241da8 c1241da8 [ 1440.063059] 3be0: de803ffc faacd85f de803c60 bad00780 c204e68c c01f539c 0000000d c01f52c4 [ 1440.071285] 3c00: 41b58ab3 c195e47c c01f530c c01f52c4 c45904b4 c01f52c4 c507a104 00000000 [ 1440.079510] 3c20: de803c88 00000040 00000000 00000008 c3020000 de803c88 00000001 c62ff400 [ 1440.087635] 3c40: c1253858 c0887230 00000000 00000000 83b6dbea c507a104 00000000 faacd85f [ 1440.095860] 3c60: 00000000 c62ff404 00000000 c3020000 00000000 faacd85f c62ff604 00000000 [ 1440.103987] 3c80: c3020000 c036bd10 c036bd10 c036d64c c036bfb4 c0369864 c01d8bb4 c01de580 [ 1440.112211] 3ca0: c0135ac4 c1241da8 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.120333] 3cc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.128555] 3ce0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.136777] 3d00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.144899] 3d20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.153121] 3d40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.161343] 3d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 1440.169469] 3d80: 00000000 00000000 c3020000 b7c5fec0 c62ff600 c036d64c dd826bb8 c036bfb4 [ 1440.177696] 3da0: c3020000 c62ff600 c01d8bb4 dd826bb8 00000000 c62ff604 c1253858 c0369864 [ 1440.185823] 3dc0: da2eb640 d19ca500 d19ca500 d19cad20 da2eb640 c5419280 0000000a da2eb640 [ 1440.194049] 3de0: c1c70940 c62ff608 c62ff604 c1253858 c204e68c c01d8bb4 c3130000 00000000 [ 1440.202174] 3e00: 00000000 de803ee0 c31306ac c5419284 de803e80 00000009 00000000 0000000a [ 1440.210400] 3e20: da2eb680 c541948c bad007cc c1c06d14 00000001 c31306ac c5419288 da2eb6a4 [ 1440.218627] 3e40: da2eb6c8 de803ec0 de803f2c 00000000 c3130200 d0721280 de803f2c c017f120 [ 1440.226754] 3e60: 41b58ab3 c195cd48 c01d8858 80080093 c206f70c c01dd1a0 bad007d4 c01dd8c4 [ 1440.234980] 3e80: c62fea04 c2b8a004 00000055 c01e3e48 00000000 00000001 00020330 c206f70c [ 1440.243106] 3ea0: 41b58ab3 c1956708 c1b8ba80 00000009 c1c06d14 c5419280 c204e44c c0136398 [ 1440.251333] 3ec0: c5419280 faacd85f c1b8c649 da2eb640 da2eb680 c1c06d14 c5419280 c204e44c [ 1440.259460] 3ee0: c206f70c da2eb650 c1331e80 c01de580 da2e4a50 1875f000 c1c70940 da2eb64a [ 1440.267686] 3f00: c5419284 c01736fc 00400000 c1c050a4 00000200 c5419280 c5419284 00000101 [ 1440.275911] 3f20: 1875f000 c204dc48 0000000a c0135ac4 00000009 00000009 c1b843d8 c1c05080 [ 1440.284037] 3f40: de803f30 c1b843b0 00000009 00000001 c1b8ba80 00400000 00000000 0001bd06 [ 1440.292264] 3f60: de803fc0 c1c05d40 c30c3c00 00400000 c541948c bad007f0 de803f88 c0eb80d8 [ 1440.300391] 3f80: 41b58ab3 c1952a48 c01358f4 c02b9c30 00000000 c30b7400 d0c85340 c088be94 [ 1440.308618] 3fa0: 00000000 c02b9c30 c1b8aab0 c1c07538 c1dbae00 c1b8a2f4 c1b8a2fc de803fd8 [ 1440.316745] 3fc0: c1b8a2f4 c1b8a2fc de803fd8 1875f000 da2e92f4 c12a7030 c1c0d940 c1b8ba80 [ 1440.324973] 3fe0: 1875f000 600f0013 1875f000 c20795c0 c5419360 c5419470 e5333f40 c1241da8 [ 1440.333183] __read_once_word_nocheck from unwind_exec_insn+0x364/0x658 [ 1440.339726] unwind_exec_insn from unwind_frame+0x270/0x618 [ 1440.345352] unwind_frame from arch_stack_walk+0x6c/0xe0 [ 1440.350674] arch_stack_walk from stack_trace_save+0x90/0xc0 [ 1440.356308] stack_trace_save from kasan_save_stack+0x30/0x4c [ 1440.362042] kasan_save_stack from __kasan_record_aux_stack+0x84/0x8c [ 1440.368473] __kasan_record_aux_stack from task_work_add+0x90/0x210 [ 1440.374706] task_work_add from scheduler_tick+0x18c/0x250 [ 1440.380245] scheduler_tick from update_process_times+0x124/0x148 [ 1440.386287] update_process_times from tick_sched_handle+0x64/0x88 [ 1440.392521] tick_sched_handle from tick_sched_timer+0x60/0xcc [ 1440.398341] tick_sched_timer from __hrtimer_run_queues+0x2c4/0x59c [ 1440.404572] __hrtimer_run_queues from hrtimer_interrupt+0x1bc/0x3a0 [ 1440.411009] hrtimer_interrupt from arch_timer_handler_virt+0x34/0x3c [ 1440.417447] arch_timer_handler_virt from handle_percpu_devid_irq+0xf4/0x368 [ 1440.424480] handle_percpu_devid_irq from generic_handle_domain_irq+0x38/0x48 [ 1440.431618] generic_handle_domain_irq from gic_handle_irq+0x90/0xa8 [ 1440.437953] gic_handle_irq from generic_handle_arch_irq+0x30/0x40 [ 1440.444094] generic_handle_arch_irq from __irq_svc+0x88/0xc8 [ 1440.449920] Exception stack(0xde803a30 to 0xde803a78) [ 1440.454914] 3a20: de803b00 00000000 00000001 000000c0 [ 1440.463141] 3a40: e5333f40 de803ba0 de803bd0 00000001 e5333f40 de803b00 c1241d90 bad0075c [ 1440.471262] 3a60: c20584b8 de803a7c c0114114 c0113850 200f0013 ffffffff [ 1440.477959] __irq_svc from unwind_exec_insn+0x4/0x658 [ 1440.483078] unwind_exec_insn from call_with_stack+0x18/0x20 [ 1440.488722] 8<--- cut here ---