linux-kernel - Re: [PATCH] scripts/kallsyms: fix memory corruption caused by write over-run

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Message-ID: <CAMrEMU86jmds8LMmbdVk=54h+ziY=6MHwyzHxVRXy5dLGFTmGA@mail.gmail.com>
Date:   Mon, 10 Feb 2020 18:36:42 -0800
From:   Justin Capella <justincapella@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        youling257 <youling257@...il.com>, Pavel Machek <pavel@....cz>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts/kallsyms: fix memory corruption caused by write over-run

Looks like len is already +1, maybe it shouldn't be?

>         len = strlen(name) + 1;
>
> -       sym = malloc(sizeof(*sym) + len);
> +       sym = malloc(sizeof(*sym) + len + 1);


Maybe strlcpy or if len wasn't incremented?

>
> -       memcpy(sym_name(sym), name, len);
> +       strcpy(sym_name(sym), name);
>