From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, arnd@arndb.de, fabf@skynet.be,
gregkh@linuxfoundation.org, keescook@chromium.org,
linux-mm@kvack.org, linux@roeck-us.net, mcroce@microsoft.com,
mm-commits@vger.kernel.org, pasha.tatashin@soleen.com,
pmladek@suse.com, robinmholt@gmail.com, rppt@kernel.org,
stable@vger.kernel.org, torvalds@linux-foundation.org
Subject: [patch 08/14] Revert "kernel/reboot.c: convert simple_strtoul to kstrtoint"
Date: Fri, 13 Nov 2020 22:52:02 -0800
Message-ID: <20201114065202.FWrl0Eulf%akpm@linux-foundation.org> (raw)
In-Reply-To: <20201113225115.b24faebc85f710d5aff55aa7@linux-foundation.org>
From: Matteo Croce <mcroce@microsoft.com>
Subject: Revert "kernel/reboot.c: convert simple_strtoul to kstrtoint"
Patch series "fix parsing of reboot= cmdline", v3.
The parsing of the reboot= cmdline has two major errors:
- a missing bound check can crash the system on reboot
- parsing of the cpu number only works if specified last
Fix both.
This patch (of 2):
This reverts commit 616feab753972b97.
kstrtoint() and simple_strtoul() have a subtle difference which makes them
non interchangeable: if a non digit character is found amid the parsing,
the former will return an error, while the latter will just stop parsing,
e.g. simple_strtoul("123xyx") = 123.
The kernel cmdline reboot= argument allows to specify the CPU used for
rebooting, with the syntax `s####` among the other flags, e.g.
"reboot=warm,s31,force", so if this flag is not the last given, it's
silently ignored as well as the subsequent ones.
Link: https://lkml.kernel.org/r/20201103214025.116799-2-mcroce@linux.microsoft.com
Fixes: 616feab75397 ("kernel/reboot.c: convert simple_strtoul to kstrtoint")
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Robin Holt <robinmholt@gmail.com>
Cc: Fabian Frederick <fabf@skynet.be>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/reboot.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
--- a/kernel/reboot.c~revert-kernel-rebootc-convert-simple_strtoul-to-kstrtoint
+++ a/kernel/reboot.c
@@ -551,22 +551,15 @@ static int __init reboot_setup(char *str
break;
case 's':
- {
- int rc;
-
- if (isdigit(*(str+1))) {
- rc = kstrtoint(str+1, 0, &reboot_cpu);
- if (rc)
- return rc;
- } else if (str[1] == 'm' && str[2] == 'p' &&
- isdigit(*(str+3))) {
- rc = kstrtoint(str+3, 0, &reboot_cpu);
- if (rc)
- return rc;
- } else
+ if (isdigit(*(str+1)))
+ reboot_cpu = simple_strtoul(str+1, NULL, 0);
+ else if (str[1] == 'm' && str[2] == 'p' &&
+ isdigit(*(str+3)))
+ reboot_cpu = simple_strtoul(str+3, NULL, 0);
+ else
*mode = REBOOT_SOFT;
break;
- }
+
case 'g':
*mode = REBOOT_GPIO;
break;
_
next prev parent reply index
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-14 6:51 incoming Andrew Morton
2020-11-14 6:51 ` [patch 01/14] mm/compaction: count pages and stop correctly during page isolation Andrew Morton
2020-11-14 6:51 ` [patch 02/14] mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate Andrew Morton
2020-11-14 6:51 ` [patch 03/14] mm/vmscan: fix NR_ISOLATED_FILE corruption on 64-bit Andrew Morton
2020-11-14 21:39 ` Linus Torvalds
2020-11-14 22:14 ` Matthew Wilcox
2020-11-14 6:51 ` [patch 04/14] mailmap: fix entry for Dmitry Baryshkov/Eremin-Solenikov Andrew Morton
2020-11-14 6:51 ` [patch 05/14] mm/slub: fix panic in slab_alloc_node() Andrew Morton
2020-11-14 6:51 ` [patch 06/14] mm/gup: use unpin_user_pages() in __gup_longterm_locked() Andrew Morton
2020-11-14 6:51 ` [patch 07/14] compiler.h: fix barrier_data() on clang Andrew Morton
2020-11-14 6:52 ` Andrew Morton [this message]
2020-11-14 6:52 ` [patch 09/14] reboot: fix overflow parsing reboot cpu number Andrew Morton
2020-11-14 6:52 ` [patch 10/14] kernel/watchdog: fix watchdog_allowed_mask not used warning Andrew Morton
2020-11-14 6:52 ` [patch 11/14] mm: memcontrol: fix missing wakeup polling thread Andrew Morton
2020-11-14 6:52 ` [patch 12/14] hugetlbfs: fix anon huge page migration race Andrew Morton
2020-11-14 6:52 ` [patch 13/14] panic: don't dump stack twice on warn Andrew Morton
2020-11-14 6:52 ` [patch 14/14] ocfs2: initialize ip_next_orphan Andrew Morton
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