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Message-Id: <166569033638.14806.1663998722831611197.b4-ty@rivosinc.com>
Date: Thu, 13 Oct 2022 12:45:36 -0700
From: Palmer Dabbelt <palmer@...osinc.com>
To: Guo Ren <guoren@...nel.org>, Albert Ou <aou@...s.berkeley.edu>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Jisheng Zhang <jszhang@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3] riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
On Sat, 24 Sep 2022 15:07:37 +0800, Jisheng Zhang wrote:
> Testing tools/testing/selftests/timens/vfork_exec.c got below
> kernel log:
>
> [ 6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020
> [ 6.842255] Oops [#1]
> [ 6.842871] Modules linked in:
> [ 6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8
> [ 6.845861] Hardware name: riscv-virtio,qemu (DT)
> [ 6.848009] epc : vdso_join_timens+0xd2/0x110
> [ 6.850097] ra : vdso_join_timens+0xd2/0x110
> [ 6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0
> [ 6.852562] gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030
> [ 6.853852] t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40
> [ 6.854984] s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c
> [ 6.856221] a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000
> [ 6.858114] a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038
> [ 6.859484] s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000
> [ 6.860751] s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38
> [ 6.862029] s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e
> [ 6.863304] s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f
> [ 6.864565] t5 : ffffffff80d11130 t6 : ff6000000181fa00
> [ 6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d
> [ 6.868046] [<ffffffff8008dc94>] timens_commit+0x38/0x11a
> [ 6.869089] [<ffffffff8008dde8>] timens_on_fork+0x72/0xb4
> [ 6.870055] [<ffffffff80190096>] begin_new_exec+0x3c6/0x9f0
> [ 6.871231] [<ffffffff801d826c>] load_elf_binary+0x628/0x1214
> [ 6.872304] [<ffffffff8018ee7a>] bprm_execve+0x1f2/0x4e4
> [ 6.873243] [<ffffffff8018f90c>] do_execveat_common+0x16e/0x1ee
> [ 6.874258] [<ffffffff8018f9c8>] sys_execve+0x3c/0x48
> [ 6.875162] [<ffffffff80003556>] ret_from_syscall+0x0/0x2
> [ 6.877484] ---[ end trace 0000000000000000 ]---
>
> [...]
Applied, thanks!
[1/1] riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
https://git.kernel.org/palmer/c/a8616d2dc193
Best regards,
--
Palmer Dabbelt <palmer@...osinc.com>
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