linux-kernel - Re: [PATCH] scsi: require CAP_SYS_ADMIN to write to procfs interface

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Message-ID: <8769e150-db7b-b020-66e6-7f5e9c102977@suse.de>
Date:   Sun, 5 Nov 2017 07:26:51 +1100
From:   Aleksa Sarai <asarai@...e.de>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org,
        Valentin Rothberg <vrothberg@...e.com>, cyphar@...har.com,
        stable@...r.kernel.org, "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] scsi: require CAP_SYS_ADMIN to write to procfs interface

>> Previously, the only capability effectively required to operate on the
>> /proc/scsi interface was CAP_DAC_OVERRIDE (or for some other files,
>> having an fsuid of GLOBAL_ROOT_UID was enough). This means that
>> semi-privileged processes could interfere with core components of a
>> system (such as causing a DoS by removing the underlying SCSI device of
>> the host's / mount).
>>
>> Cc: <stable@...r.kernel.org>
>> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
>> Signed-off-by: Aleksa Sarai <asarai@...e.de>
>> ---
>>   drivers/scsi/scsi_proc.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
>> index 480a597b3877..486aedce2f05 100644
>> --- a/drivers/scsi/scsi_proc.c
>> +++ b/drivers/scsi/scsi_proc.c
>> @@ -51,7 +51,10 @@ static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,
>>   	struct Scsi_Host *shost = PDE_DATA(file_inode(file));
>>   	ssize_t ret = -ENOMEM;
>>   	char *page;
>> -
>> +
>> +	if (!capable(CAP_SYS_ADMIN))
>> +		return -EPERM
> 
> did that build without a trailing ';' ?

D'oh. Re-sent, thanks.

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
https://www.cyphar.com/