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Re: [Qemu-trivial] [Qemu-devel] [PATCH v2] fsdev/virtfs-proxy-helper: Fi
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-trivial] [Qemu-devel] [PATCH v2] fsdev/virtfs-proxy-helper: Fix possible overflow |
Date: |
Mon, 30 Mar 2015 14:29:41 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Sat, Mar 14, 2015 at 10:00:16AM +0800, Shannon Zhao wrote:
> It's detected by coverity. As max of sockaddr_un.sun_path is
> sizeof(helper.sun_path), should check the length of source
> and use strncpy instead of strcpy.
>
> Signed-off-by: Shannon Zhao <address@hidden>
> Signed-off-by: Shannon Zhao <address@hidden>
> ---
> v1->v2: Still use strcpy [Paolo]
> ---
> fsdev/virtfs-proxy-helper.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
> index bf2e5f3..13fe032 100644
> --- a/fsdev/virtfs-proxy-helper.c
> +++ b/fsdev/virtfs-proxy-helper.c
> @@ -738,6 +738,7 @@ static int proxy_socket(const char *path, uid_t uid,
> gid_t gid)
> return -1;
> }
>
> + g_assert(strlen(path) < sizeof(proxy.sun_path));
> sock = socket(AF_UNIX, SOCK_STREAM, 0);
path is user input. While the assertion check silences Coverity, it is
not suitable for input validation. Users expect a graceful exit with an
error message, not an assertion failure if the given path is too long.
I will send a patch.
Stefan
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