From: ludo@gnu.org (Ludovic Courtès)
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: 30604@debbugs.gnu.org
Subject: [bug#30604] [PATCH v10 5/6] linux-initrd: Provide our own 'modprobe' program.
Date: Mon, 12 Mar 2018 23:14:59 +0100 [thread overview]
Message-ID: <87h8plkkkc.fsf@gnu.org> (raw)
In-Reply-To: <20180312210936.7f89a29c@scratchpost.org> (Danny Milosavljevic's message of "Mon, 12 Mar 2018 21:09:36 +0100")
Howdy!
Danny Milosavljevic <dannym@scratchpost.org> skribis:
> On Mon, 12 Mar 2018 13:39:17 +0100
> Ludovic Courtès <ludo@gnu.org> wrote:
>
>> + (when modprobe
>> + ;; Tell the kernel to invoke MODPROBE.
>> + (call-with-output-file "/proc/sys/kernel/modprobe"
>> + (lambda (port)
>> + (display modprobe port))))
>> +
>> (display "loading kernel modules...\n")
>
> There's a race because Linux could just start loading modules
> immediately before boot-system even starts / executed far enough.
>
> That was why earlier I kept /sbin/modprobe as the name (it's the
> default Linux uses) and made sure that the file /sbin/modprobe is already
> in the initrd (as opposed to created by boot-system).
>
> The race didn't happen to me yet (and I doubt that Linux has modules
> fine-grained enough that that's a problem in practise) - but I would prefer
> it not to be possible.
>
> WDYT?
You’re right, I wondered what would happen. I’ve restored the
/sbin/modprobe symlink in v11.
>> + (define aliases
>> + ;; The list of aliases we are asked to load.
>> + (filter-map (match-lambda
>> + (('argument . alias) alias)
>> + (_ #f))
>> + options))
>
> Without "-a", it's not supposed to be a list of aliases. It's supposed to be
> one alias and the remainder are parameters supposed to be passed to that
> kernel module.
>
> (I didn't know that before).
>
> When Linux invokes /sbin/modprobe, it doesn't pass "-a" but it doesn't
> pass any module parameters either - it just passes one module alias.
>
> For clarity and in order that we don't have weird problems later (trying to
> load a module named "verbose=1" or something :) ), let's just accept one alias
> for now.
Indeed, done in v11.
>>+(define* (modprobe-program linux-module-directory #:key
>>+ (guile %guile-static-stripped))
> [...]
>> + (call-with-output-file "/dev/kmsg"
>> + (lambda (port)
>> + (format port "modprobe[~a]: aliases ~s; modules ~s; args ~s~%"
>> + (getpid) aliases modules (program-arguments))))
>
> Hmm, logging is nice!
I didn’t mean to leave it, but after all, it’s pretty useful. :-)
> But with /dev/kmsg one write(2) syscall needs to pass the entire message.
>
> What do you think about additionally calling setvbuf with 1024 ? Because:
Sure.
>> + (write-module-alias-database #$output))))
>
> One of the devnames created statically is the one for btrfs, so not writing or
> using devnames is not going to end well.
We’re fine because btrfs, 9p, overlay, etc. all have an “fs-btrfs”,
“fs-9p”, etc. alias, which shows up in “modules.alias”. No need for
“modules.devname” AFAICS.
> (I'd also copy the modules.builtin (from Linux).
> Also, what happens if we load a module which has as dependency a builtin?
> Will we try to load the builtin as a .ko file and fail the entire thing?)
The dependency of a builtin is necessarily a builtin, and the kernel
won’t invoke modprobe for a builtin, will it? IOW, I think there’s no
problem here. :-)
>> + ;; We may need to lazy-load modules. The initrd installs a
>
> Nitpick: "kernel modules" (to clarify).
Fixed.
Thanks for the insightful review!
Ludo’.
next prev parent reply other threads:[~2018-03-12 22:16 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-25 11:45 [bug#30604] [PATCH 0/4] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-02-25 11:48 ` [bug#30604] [PATCH 1/4] gnu: kmod: Split off kmod-minimal Danny Milosavljevic
2018-02-25 11:48 ` [bug#30604] [PATCH 2/4] gnu: Add kmod-minimal-static Danny Milosavljevic
2018-02-25 11:48 ` [bug#30604] [PATCH 3/4] linux-initrd: Add kmod Danny Milosavljevic
2018-02-25 14:05 ` Mathieu Othacehe
2018-02-25 15:07 ` Danny Milosavljevic
2018-02-26 11:51 ` Mathieu Othacehe
2018-02-25 11:48 ` [bug#30604] [PATCH 4/4] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-02-26 1:10 ` [bug#30604] [PATCH 1/4] gnu: kmod: Split off kmod-minimal Marius Bakke
2018-02-26 3:50 ` [bug#30604] [PATCH v2 0/6] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 1/6] gnu: kmod: Split off kmod-minimal Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 2/6] gnu: Add kmod-minimal-static Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 3/6] linux-initrd: Add kmod Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 4/6] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 5/6] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-02-26 3:50 ` [bug#30604] [PATCH v2 6/6] vm: Make the virtio-blk is uniquely identifyable in /sys Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 0/6] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 1/6] gnu: kmod: Split off kmod-minimal Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 2/6] gnu: Add kmod-minimal-static Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 3/6] linux-initrd: Add kmod Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 4/6] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-02-27 14:26 ` Ludovic Courtès
2018-02-26 4:06 ` [bug#30604] [PATCH v3 5/6] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-02-26 4:06 ` [bug#30604] [PATCH v3 6/6] vm: Make the virtio-blk is uniquely identifyable in /sys Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 0/7] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 1/7] gnu: kmod: Split off kmod-minimal Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 2/7] gnu: Add kmod-minimal-static Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 3/7] linux-initrd: Add kmod Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 4/7] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 5/7] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 6/7] vm: Make the virtio-blk uniquely identifyable in /sys Danny Milosavljevic
2018-02-27 11:26 ` [bug#30604] [PATCH v4 7/7] linux-boot: Call make-static-device-nodes much earlier Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 0/7] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 1/7] gnu: kmod: Split off kmod-minimal Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 2/7] gnu: Add kmod-minimal-static Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 3/7] linux-initrd: Add kmod Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 4/7] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 5/7] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 6/7] vm: Make the virtio-blk is uniquely identifyable in /sys Danny Milosavljevic
2018-02-27 15:50 ` [bug#30604] [PATCH v5 7/7] linux-boot: Call make-static-device-nodes much earlier Danny Milosavljevic
2018-03-02 14:16 ` [bug#30604] [PATCH v6 0/6] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 1/6] linux-modules: Add module-aliases Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 2/6] linux-modules: Add install-modules Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 3/6] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 4/6] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 5/6] vm: Make the virtio-blk uniquely identifiable in /sys Danny Milosavljevic
2018-03-02 14:17 ` [bug#30604] [PATCH v6 6/6] linux-initrd: Provide modprobe to the initrd Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 0/6] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 1/6] linux-modules: Add module-aliases Danny Milosavljevic
2018-03-02 16:47 ` Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 2/6] linux-modules: Add install-modules Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 3/6] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-03-02 16:47 ` Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 4/6] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 5/6] vm: Make the virtio-blk uniquely identifiable in /sys Danny Milosavljevic
2018-03-02 15:34 ` [bug#30604] [PATCH v7 6/6] linux-initrd: Provide modprobe to the initrd Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 0/7] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 1/7] linux-modules: Add module-aliases Danny Milosavljevic
2018-03-03 21:58 ` Ludovic Courtès
2018-03-03 13:55 ` [bug#30604] [PATCH v8 2/7] linux-modules: Add install-modules Danny Milosavljevic
2018-03-03 15:32 ` Danny Milosavljevic
2018-03-03 22:07 ` Ludovic Courtès
2018-03-04 12:45 ` Danny Milosavljevic
2018-03-04 12:53 ` Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 3/7] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-03-03 22:48 ` Ludovic Courtès
2018-03-04 1:06 ` Danny Milosavljevic
2018-03-04 1:54 ` Danny Milosavljevic
2018-03-04 12:34 ` Danny Milosavljevic
2018-03-09 22:06 ` Ludovic Courtès
2018-03-09 22:13 ` Danny Milosavljevic
2018-03-09 22:19 ` Danny Milosavljevic
2018-03-09 22:44 ` Danny Milosavljevic
2018-03-12 12:38 ` Ludovic Courtès
2018-03-12 12:39 ` [bug#30604] [PATCH v10 1/6] linux-modules: Add "modules.alias" writer Ludovic Courtès
2018-03-12 12:39 ` [bug#30604] [PATCH v10 2/6] linux-modules: Add 'load-linux-modules-from-directory' Ludovic Courtès
2018-03-12 19:26 ` Danny Milosavljevic
2018-03-12 12:39 ` [bug#30604] [PATCH v10 3/6] linux-modules: Add 'load-needed-linux-modules' Ludovic Courtès
2018-03-12 19:40 ` Danny Milosavljevic
2018-03-12 21:10 ` Ludovic Courtès
2018-03-12 12:39 ` [bug#30604] [PATCH v10 4/6] vm: Make the virtio-blk uniquely identifiable in /sys Ludovic Courtès
2018-03-12 12:39 ` [bug#30604] [PATCH v10 5/6] linux-initrd: Provide our own 'modprobe' program Ludovic Courtès
2018-03-12 20:09 ` Danny Milosavljevic
2018-03-12 21:12 ` Danny Milosavljevic
2018-03-13 8:54 ` Ludovic Courtès
2018-03-12 22:14 ` Ludovic Courtès [this message]
2018-03-12 22:15 ` [bug#30604] [PATCH v11 1/6] linux-modules: Add "modules.alias" writer Ludovic Courtès
2018-03-12 22:15 ` [bug#30604] [PATCH v11 2/6] linux-modules: Add 'load-linux-modules-from-directory' Ludovic Courtès
2018-03-12 22:48 ` Danny Milosavljevic
2018-03-12 22:15 ` [bug#30604] [PATCH v11 3/6] linux-modules: Add 'load-needed-linux-modules' Ludovic Courtès
2018-03-12 23:00 ` Danny Milosavljevic
2018-03-13 8:55 ` Ludovic Courtès
2018-03-12 22:15 ` [bug#30604] [PATCH v11 4/6] vm: Make the virtio-blk uniquely identifiable in /sys Ludovic Courtès
2018-03-12 22:49 ` Danny Milosavljevic
2018-03-12 22:15 ` [bug#30604] [PATCH v11 5/6] linux-initrd: Provide our own 'modprobe' program Ludovic Courtès
2018-03-13 8:50 ` Ludovic Courtès
2018-03-13 9:28 ` Ludovic Courtès
2018-03-13 12:28 ` Danny Milosavljevic
2018-03-12 22:15 ` [bug#30604] [PATCH v11 6/6] linux-modules: Add "modules.devname" writer Ludovic Courtès
2018-03-12 22:55 ` Danny Milosavljevic
2018-03-13 8:56 ` Ludovic Courtès
2018-03-12 22:48 ` [bug#30604] [PATCH v11 1/6] linux-modules: Add "modules.alias" writer Danny Milosavljevic
2018-03-13 9:27 ` [bug#30604] [PATCH v10 5/6] linux-initrd: Provide our own 'modprobe' program Danny Milosavljevic
2018-03-13 10:51 ` Ludovic Courtès
2018-03-13 12:05 ` Danny Milosavljevic
2018-03-13 19:17 ` Danny Milosavljevic
2018-03-12 12:39 ` [bug#30604] [PATCH v10 6/6] linux-modules: Add "modules.devname" writer Ludovic Courtès
2018-03-12 19:54 ` [bug#30604] [PATCH v10 1/6] linux-modules: Add "modules.alias" writer Danny Milosavljevic
2018-03-12 21:13 ` Ludovic Courtès
2018-03-09 22:36 ` [bug#30604] [PATCH v8 3/7] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 4/7] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 5/7] vm: Make the virtio-blk uniquely identifiable in /sys Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 6/7] linux-initrd: Provide modprobe to the initrd Danny Milosavljevic
2018-03-03 13:55 ` [bug#30604] [PATCH v8 7/7] linux-initrd: Factorize %modprobe and flat-linux-module-directory Danny Milosavljevic
2018-03-03 18:01 ` Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 0/7] Load Linux module only when supported hardware is present Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 1/7] linux-modules: Add "modules.devname" and "modules.alias" writer Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 2/7] linux-modules: Add module-aliases->module-file-names Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 3/7] linux-initrd: Provide pure-Guile modprobe Danny Milosavljevic
2018-03-11 20:24 ` Danny Milosavljevic
2018-03-12 14:45 ` Ludovic Courtès
2018-03-12 17:51 ` Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 4/7] linux-boot: Load kernel modules only when the hardware is present Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 5/7] vm: Allow qemu-image builder to load Linux kernel modules Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 6/7] vm: Make the virtio-blk uniquely identifiable in /sys Danny Milosavljevic
2018-03-04 1:09 ` [bug#30604] [PATCH v9 7/7] linux-initrd: Use module-aliases->module-file-names, too Danny Milosavljevic
2018-03-09 22:26 ` Danny Milosavljevic
2018-03-18 15:03 ` [bug#30604] Keyboard detection before ‘cryptsetup’ runs Ludovic Courtès
2018-03-23 13:02 ` Danny Milosavljevic
2018-03-23 15:07 ` Danny Milosavljevic
2018-03-24 17:07 ` Ludovic Courtès
2018-03-24 17:12 ` Ludovic Courtès
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