linux-kernel - Re: [Outreachy kernel] [PATCH v2] staging: android: Replace strcpy with strlcpy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CALrZqyPw8rU8RuoAT83rxjVGdckvuS7F1gqVXDcerQ0kXEM30g@mail.gmail.com>
Date:   Sun, 12 Mar 2017 03:00:43 +0530
From:   SIMRAN SINGHAL <singhalsimran0@...il.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Greg KH <gregkh@...uxfoundation.org>, arve@...roid.com,
        riandrews@...roid.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v2] staging: android: Replace strcpy
 with strlcpy

On Sun, Mar 12, 2017 at 2:53 AM, Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
> On Sun, 12 Mar 2017, simran singhal wrote:
>
>> Replace strcpy with strlcpy as strcpy does not check for buffer
>> overflow.
>> This is found using Flawfinder.
>>
>> Signed-off-by: simran singhal <singhalsimran0@...il.com>
>> ---
>>
>>  v2:
>>    -Correcting the place of the parenthesis
>>
>>  drivers/staging/android/ashmem.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
>> index 7cbad0d..eb2f4ef 100644
>> --- a/drivers/staging/android/ashmem.c
>> +++ b/drivers/staging/android/ashmem.c
>> @@ -548,7 +548,8 @@ static int set_name(struct ashmem_area *asma, void __user *name)
>>       if (unlikely(asma->file))
>>               ret = -EINVAL;
>>       else
>> -             strcpy(asma->name + ASHMEM_NAME_PREFIX_LEN, local_name);
>> +             strlcpy(asma->name + ASHMEM_NAME_PREFIX_LEN, local_name,
>> +                     sizeof(asma->name + ASHMEM_NAME_PREFIX_LEN));
>
> This appears to be the old patch.
>
> Actually, looking closer, I don't think this is right at all.  There seems
> to be a goal of leaving some space at the beginning of asma->name.  So the
> amount of space available for local_name would be computed using a
> subtraction, not an addition.
>
Julia, By mistake I sent the wrong patch.
And I am not getting you want to mention which space.

> julia
>
>>
>>       mutex_unlock(&ashmem_mutex);
>>       return ret;
>> --
>> 2.7.4
>>
>> --
>> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@...glegroups.com.
>> To post to this group, send email to outreachy-kernel@...glegroups.com.
>> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170311211725.GA12884%40singhal-Inspiron-5558.
>> For more options, visit https://groups.google.com/d/optout.
>>