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Re: [PATCH] Fix i386 memmove issue [BZ #22644]
- From: Andreas Schwab <schwab at suse dot de>
- To: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, libc-alpha <libc-alpha at sourceware dot org>, Max Horn <max at quendi dot de>, thomas at grindinggear dot com
- Date: Mon, 19 Mar 2018 14:11:01 +0100
- Subject: Re: [PATCH] Fix i386 memmove issue [BZ #22644]
- References: <CAMXFM3s5b2a6o_CMS0cJ35oE3SuJUHssqLAUY94LSZhEEtG71A@mail.gmail.com> <mvm606ts2w6.fsf@suse.de> <CAMXFM3vqw7eiUT1XYVZWyW=eJkgEpjNc74A8mbmdKuR_hywN3w@mail.gmail.com> <CAMe9rOo4Ys=ScEKKnuv5XvYqTHjvFxSkXjch8ya8sX7dfP+q4Q@mail.gmail.com> <CAMXFM3vA=-LSK5VtKhhbs0g9faBdG0GjoAbNb6OPEbSt8dAA7A@mail.gmail.com>
On Mär 19 2018, Andrew Senkevich <andrew.n.senkevich@gmail.com> wrote:
> +static void
> +do_test2 (void)
> +{
> + uint32_t num = 0x20000000;
> + uint32_t * large_buf;
> +
> + large_buf = mmap ((void*)0x70000000, num, PROT_READ | PROT_WRITE,
> + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0);
Since you are using MAP_FIXED this may overwrite an existing mapping.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
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