On 09/25/14 17:55, Andy Lutomirski wrote:
> If a user puts init=/whatever on the command line and /whatever
> can't be run, then the kernel will try a few default options before
> giving up. If init=/whatever came from a bootloader prompt, then
> this probably makes sense. On the other hand, if it comes from a
> script (e.g. a tool like virtme or perhaps a future kselftest
> script), then the fallbacks are likely to exist, but they'll do the
> wrong thing. For example, they might unexpectedly invoke systemd.
>
> This adds a new option called strictinit. If init= and strictinit
> are both set, and the init= binary is not executable, then the
> kernel will panic immediately. If strictinit is set but init= is
> not set, then strictinit will have no effect, because the only real
> alternative would be to panic regardless of the contents of the root
> fs.
>
> Signed-off-by: Andy Lutomirski <[email protected]>
> ---
> Documentation/kernel-parameters.txt | 8 ++++++++
> init/main.c | 10 ++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/Documentation/kernel-parameters.txt
> b/Documentation/kernel-parameters.txt
> index 10d51c2f10d7..60f8b3a7a506 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -3236,6 +3236,14 @@ bytes respectively. Such letter suffixes can also be
> entirely omitted.
> stifb= [HW]
> Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
>
> + strictinit [KNL,BOOT]
> + Normally, the kernel can't find the init binary
, if the kernel
> + specified by rdinit= and/or init=, then it will
> + try several fallbacks. If strictinit is set
> + and the value specified by init= does not work,
> + then the kernel will panic instead.
> + This has no effect if init= is not specified.
> +
> sunrpc.min_resvport=
> sunrpc.max_resvport=
> [NFS,SUNRPC]
--
~Randy
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