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Thu, 09 Nov 2023 11:43:04 -0800 (PST) Date: Thu, 09 Nov 2023 11:43:04 -0800 In-Reply-To: <20231109192355.108550-1-kdipendra88@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000890e560609bd69aa@google.com> Subject: Re: [syzbot] [net?] BUG: unable to handle kernel paging request in nsim_bpf From: syzbot To: kdipendra88@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel paging request in nsim_xdp_set_prog Unable to handle kernel paging request at virtual address dfff800000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000004] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6540 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : nsim_prog_set_loaded drivers/net/netdevsim/bpf.c:100 [inline] pc : nsim_bpf_offload drivers/net/netdevsim/bpf.c:113 [inline] pc : nsim_xdp_offload_prog drivers/net/netdevsim/bpf.c:189 [inline] pc : nsim_xdp_set_prog+0x3f4/0x568 drivers/net/netdevsim/bpf.c:208 lr : nsim_prog_set_loaded drivers/net/netdevsim/bpf.c:99 [inline] lr : nsim_bpf_offload drivers/net/netdevsim/bpf.c:113 [inline] lr : nsim_xdp_offload_prog drivers/net/netdevsim/bpf.c:189 [inline] lr : nsim_xdp_set_prog+0x3d0/0x568 drivers/net/netdevsim/bpf.c:208 sp : ffff800097047730 x29: ffff800097047730 x28: dfff800000000000 x27: 1fffe000196b819f x26: ffff800094eee000 x25: 1ffff000129ddc07 x24: dfff800000000000 x23: 0000000000000001 x22: ffff800094eee038 x21: 0000000000000020 x20: ffff0000cb5c0d18 x19: ffff800097047820 x18: ffff800097047580 x17: ffff8000805c1258 x16: ffff80008030c738 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000004 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff800094eee000 x4 : 0000000000000000 x3 : ffff80008030c754 x2 : ffff0000cb5c0d18 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: nsim_prog_set_loaded drivers/net/netdevsim/bpf.c:100 [inline] nsim_bpf_offload drivers/net/netdevsim/bpf.c:113 [inline] nsim_xdp_offload_prog drivers/net/netdevsim/bpf.c:189 [inline] nsim_xdp_set_prog+0x3f4/0x568 drivers/net/netdevsim/bpf.c:208 nsim_bpf+0x5ac/0xaec dev_xdp_install+0x124/0x2f0 net/core/dev.c:9199 dev_xdp_attach+0xa4c/0xcc8 net/core/dev.c:9351 dev_xdp_attach_link net/core/dev.c:9370 [inline] bpf_xdp_link_attach+0x300/0x710 net/core/dev.c:9540 link_create+0x2c0/0x68c kernel/bpf/syscall.c:4954 __sys_bpf+0x4d4/0x5dc kernel/bpf/syscall.c:5414 __do_sys_bpf kernel/bpf/syscall.c:5448 [inline] __se_sys_bpf kernel/bpf/syscall.c:5446 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5446 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Code: 96b36ecd f94002a8 91008115 d343fea8 (38f86908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 96b36ecd bl 0xfffffffffacdbb34 4: f94002a8 ldr x8, [x21] 8: 91008115 add x21, x8, #0x20 c: d343fea8 lsr x8, x21, #3 * 10: 38f86908 ldrsb w8, [x8, x24] <-- trapping instruction Tested on: commit: 8de1e7af Merge branch 'for-next/core' into for-kernelci git tree: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1097a35b680000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e6feaeda5dcbc27 dashboard link: https://syzkaller.appspot.com/bug?extid=44c2416196b7c607f226 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=120c37df680000