From: Catalin Marinas <catalin.marinas@arm.com>
To: Jim Meyering <jim@meyering.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jim Meyering <meyering@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] kmemleak: avoid buffer overrun: NUL-terminate strncpy-copied command
Date: Fri, 24 Aug 2012 11:27:26 +0100 [thread overview]
Message-ID: <20120824102725.GH7585@arm.com> (raw)
In-Reply-To: <1345481724-30108-4-git-send-email-jim@meyering.net>
On Mon, Aug 20, 2012 at 05:55:22PM +0100, Jim Meyering wrote:
> From: Jim Meyering <meyering@redhat.com>
>
> strncpy NUL-terminates only when the length of the source string
> is smaller than the size of the destination buffer.
> The two other strncpy uses (just preceding) happen to be ok
> with the current TASK_COMM_LEN (16), because the literals
> "hardirq" and "softirq" are both shorter than 16. However,
> technically it'd be better to use strcpy along with a
> compile-time assertion that they fit in the buffer.
>
> Signed-off-by: Jim Meyering <meyering@redhat.com>
> ---
> mm/kmemleak.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index 45eb621..947257f 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -555,6 +555,7 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
> * case, the command line is not correct.
> */
> strncpy(object->comm, current->comm, sizeof(object->comm));
> + object->comm[sizeof(object->comm) - 1] = 0;
Does it really matter here? object->comm[] and current->comm[] have the
same size, TASK_COMM_LEN.
--
Catalin
next prev parent reply other threads:[~2012-08-24 10:28 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-20 16:55 a few strncpy-related patches Jim Meyering
2012-08-20 16:55 ` [PATCH] ACPI: remove unwarranted use of strncpy Jim Meyering
2012-08-20 16:55 ` [PATCH] fs/9p: avoid debug OOPS when reading a long symlink Jim Meyering
2012-08-21 7:20 ` [PATCHv2] " Jim Meyering
2012-08-20 16:55 ` [PATCH] kmemleak: avoid buffer overrun: NUL-terminate strncpy-copied command Jim Meyering
2012-08-24 10:27 ` Catalin Marinas [this message]
2012-08-24 11:23 ` Jim Meyering
2012-08-28 20:24 ` Dan Carpenter
2012-08-29 6:28 ` Jim Meyering
2012-08-29 15:56 ` Dan Carpenter
2012-08-20 16:55 ` [PATCH] bfa: avoid buffer overrun for 12-byte model name Jim Meyering
2012-08-20 19:42 ` Krishna Gudipati
2012-08-20 20:38 ` Jim Meyering
2012-10-14 7:53 ` Jim Meyering
2012-10-14 8:20 ` Jim Meyering
2012-12-24 7:43 ` Vijay Mohan Guvva
2012-08-20 16:55 ` [PATCH] cifs: remove misleading strncpy: each name has length < 16 Jim Meyering
[not found] ` <CAE2SPAbBmRov9qK2HiBQBQXaZpfJ8pmZJ-PL18FEyoZhzDza4A@mail.gmail.com>
2012-08-20 18:40 ` Jim Meyering
2012-08-20 18:41 ` Jim Meyering
2012-08-20 20:18 ` a few strncpy-related patches Andi Kleen
2012-08-20 20:47 ` Jim Meyering
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