linux-kernel - Re: [PATCH v1 2/2] ucounts: Move rlimit max values from ucounts max

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Message-ID: <202111280022.ugxpiKpA-lkp@intel.com>
Date:   Fri, 3 Dec 2021 16:33:25 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...ts.01.org, Alexey Gladkov <legion@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>
Cc:     lkp@...el.com, kbuild-all@...ts.01.org,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v1 2/2] ucounts: Move rlimit max values from ucounts max

Hi Alexey,

url:    https://github.com/0day-ci/linux/commits/Alexey-Gladkov/ucounts-Fix-rlimit-max-values-check/20211126-224059
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 136057256686de39cc3a07c2e39ef6bc43003ff6
config: i386-randconfig-m021-20211126 (https://download.01.org/0day-ci/archive/20211128/202111280022.ugxpiKpA-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>

smatch warnings:
kernel/ucount.c:109 setup_userns_sysctls() error: buffer overflow 'ns->ucount_max' 10 <= 13

vim +109 kernel/ucount.c

dbec28460a89aa Eric W. Biederman 2016-07-30   98  bool setup_userns_sysctls(struct user_namespace *ns)
dbec28460a89aa Eric W. Biederman 2016-07-30   99  {
dbec28460a89aa Eric W. Biederman 2016-07-30  100  #ifdef CONFIG_SYSCTL
dbec28460a89aa Eric W. Biederman 2016-07-30  101  	struct ctl_table *tbl;
0f538e3e712a51 Jan Kara          2020-04-07  102  
0f538e3e712a51 Jan Kara          2020-04-07  103  	BUILD_BUG_ON(ARRAY_SIZE(user_table) != UCOUNT_COUNTS + 1);
dbec28460a89aa Eric W. Biederman 2016-07-30  104  	setup_sysctl_set(&ns->set, &set_root, set_is_seen);
f6b2db1a3e8d14 Eric W. Biederman 2016-08-08  105  	tbl = kmemdup(user_table, sizeof(user_table), GFP_KERNEL);
dbec28460a89aa Eric W. Biederman 2016-07-30  106  	if (tbl) {
25f9c0817c535a Eric W. Biederman 2016-08-08  107  		int i;
25f9c0817c535a Eric W. Biederman 2016-08-08  108  		for (i = 0; i < UCOUNT_COUNTS; i++) {
25f9c0817c535a Eric W. Biederman 2016-08-08 @109  			tbl[i].data = &ns->ucount_max[i];

The patch changes the size of ->ucount_max[] to MAX_PER_NAMESPACE_UCOUNTS
but this loop still goes up to UCOUNT_COUNTS.

25f9c0817c535a Eric W. Biederman 2016-08-08  110  		}
f6b2db1a3e8d14 Eric W. Biederman 2016-08-08  111  		ns->sysctls = __register_sysctl_table(&ns->set, "user", tbl);
dbec28460a89aa Eric W. Biederman 2016-07-30  112  	}
dbec28460a89aa Eric W. Biederman 2016-07-30  113  	if (!ns->sysctls) {
dbec28460a89aa Eric W. Biederman 2016-07-30  114  		kfree(tbl);
dbec28460a89aa Eric W. Biederman 2016-07-30  115  		retire_sysctl_set(&ns->set);
dbec28460a89aa Eric W. Biederman 2016-07-30  116  		return false;
dbec28460a89aa Eric W. Biederman 2016-07-30  117  	}
dbec28460a89aa Eric W. Biederman 2016-07-30  118  #endif
dbec28460a89aa Eric W. Biederman 2016-07-30  119  	return true;
dbec28460a89aa Eric W. Biederman 2016-07-30  120  }

---
0-DAY CI Kernel Test Service, Intel Corporation
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