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Date: Thu, 5 Nov 2020 19:09:00 +0100
From: Petr Mladek <pmladek@...e.com>
To: Matteo Croce <mcroce@...ux.microsoft.com>
Cc: linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
Arnd Bergmann <arnd@...db.de>, Mike Rapoport <rppt@...nel.org>,
Kees Cook <keescook@...omium.org>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Robin Holt <robinmholt@...il.com>,
Fabian Frederick <fabf@...net.be>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 2/3] reboot: fix overflow parsing reboot cpu number
On Tue 2020-11-03 22:40:24, Matteo Croce wrote:
> From: Matteo Croce <mcroce@...rosoft.com>
>
> Limit the CPU number to num_possible_cpus(), because setting it
> to a value lower than INT_MAX but higher than NR_CPUS produces the
> following error on reboot and shutdown:
>
> BUG: unable to handle page fault for address: ffffffff90ab1bb0
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 1c09067 P4D 1c09067 PUD 1c0a063 PMD 0
> Oops: 0000 [#1] SMP
> CPU: 1 PID: 1 Comm: systemd-shutdow Not tainted 5.9.0-rc8-kvm #110
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
> RIP: 0010:migrate_to_reboot_cpu+0xe/0x60
> Code: ea ea 00 48 89 fa 48 c7 c7 30 57 f1 81 e9 fa ef ff ff 66 2e 0f 1f 84 00 00 00 00 00 53 8b 1d d5 ea ea 00 e8 14 33 fe ff 89 da <48> 0f a3 15 ea fc bd 00 48 89 d0 73 29 89 c2 c1 e8 06 65 48 8b 3c
> RSP: 0018:ffffc90000013e08 EFLAGS: 00010246
> RAX: ffff88801f0a0000 RBX: 0000000077359400 RCX: 0000000000000000
> RDX: 0000000077359400 RSI: 0000000000000002 RDI: ffffffff81c199e0
> RBP: ffffffff81c1e3c0 R08: ffff88801f41f000 R09: ffffffff81c1e348
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 00007f32bedf8830 R14: 00000000fee1dead R15: 0000000000000000
> FS: 00007f32bedf8980(0000) GS:ffff88801f480000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffff90ab1bb0 CR3: 000000001d057000 CR4: 00000000000006a0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> __do_sys_reboot.cold+0x34/0x5b
> ? vfs_writev+0x92/0xc0
> ? do_writev+0x52/0xd0
> do_syscall_64+0x2d/0x40
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x7f32bfaaecd3
> Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 89 fa be 69 19 12 28 bf ad de e1 fe b8 a9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 89 81 0c 00 f7 d8
> RSP: 002b:00007fff6265fb58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f32bfaaecd3
> RDX: 0000000001234567 RSI: 0000000028121969 RDI: 00000000fee1dead
> RBP: 0000000000000000 R08: 0000000000008020 R09: 00007fff6265ef60
> R10: 00007f32bedf8830 R11: 0000000000000202 R12: 0000000000000000
> R13: 0000557bba2c51c0 R14: 0000000000000000 R15: 00007fff6265fbc8
> CR2: ffffffff90ab1bb0
> ---[ end trace b813e80157136563 ]---
> RIP: 0010:migrate_to_reboot_cpu+0xe/0x60
> Code: ea ea 00 48 89 fa 48 c7 c7 30 57 f1 81 e9 fa ef ff ff 66 2e 0f 1f 84 00 00 00 00 00 53 8b 1d d5 ea ea 00 e8 14 33 fe ff 89 da <48> 0f a3 15 ea fc bd 00 48 89 d0 73 29 89 c2 c1 e8 06 65 48 8b 3c
> RSP: 0018:ffffc90000013e08 EFLAGS: 00010246
> RAX: ffff88801f0a0000 RBX: 0000000077359400 RCX: 0000000000000000
> RDX: 0000000077359400 RSI: 0000000000000002 RDI: ffffffff81c199e0
> RBP: ffffffff81c1e3c0 R08: ffff88801f41f000 R09: ffffffff81c1e348
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 00007f32bedf8830 R14: 00000000fee1dead R15: 0000000000000000
> FS: 00007f32bedf8980(0000) GS:ffff88801f480000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffff90ab1bb0 CR3: 000000001d057000 CR4: 00000000000006a0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
> Kernel Offset: disabled
> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 ]---
>
> Fixes: 1b3a5d02ee07 ("reboot: move arch/x86 reboot= handling to generic kernel")
> Cc: stable@...r.kernel.org
> Signed-off-by: Matteo Croce <mcroce@...rosoft.com>
> ---
> kernel/reboot.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index 8fbba433725e..af6f23d8bea1 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -558,6 +558,13 @@ static int __init reboot_setup(char *str)
> reboot_cpu = simple_strtoul(str+3, NULL, 0);
> else
> *mode = REBOOT_SOFT;
> + if (reboot_cpu >= num_possible_cpus()) {
> + pr_err("Ignoring the CPU number in reboot= option. "
> + "CPU %d exceeds possible cpu number %d\n",
./scripts/checkpatch.pl used to complain that printk() format parameter should stay
on a single line (ignoring 80 char limit). It helps when people are
trying to find which code printed a particular message.
It is not a big deal here because %d does not allow to search the
entire message anyway.
I am not sure if Andrew would like to get this fixed. In both cases:
Reviewed-by: Petr Mladek <pmladek@...e.com>
Best Regards,
Petr
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