Compressed kernel modules

[Vishal Thanki]

I think many of us may already know it, but it was new to me so
thought of sharing.

Insmod (or rather kmod utilities) can now handle the XZ compressed
file formats. Kernel module files can now be compressed and be loaded
like:
# insmod xyz.ko.xz

Save some memory :-)

[Viral Mehta]

Great to see post on this group.

So, insmod takes care of uncompressing before loading ? Does it require lzo library to be present ? or works without that as well ?

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Thanks,
Viral Mehta

[Vishal Thanki]

On Mon, Feb 29, 2016 at 10:13 AM, Viral Mehta <vira...@gmail.com> wrote:
> Great to see post on this group.
>
> So, insmod takes care of uncompressing before loading ? Does it require lzo
> library to be present ? or works without that as well ?
>

I think libz takes care of that, have not googled yet.

➜ ~ which kmod
/usr/bin/kmod
➜ ~ ldd /usr/bin/kmod
linux-vdso.so.1 (0x00007ffcb57bc000)
liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fcbbfb37000)
libz.so.1 => /lib64/libz.so.1 (0x00007fcbbf921000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fcbbf709000)
libc.so.6 => /lib64/libc.so.6 (0x00007fcbbf349000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fcbbf12d000)
/lib64/ld-linux-x86-64.so.2 (0x00005574c024b000)
➜ ~ ldd /usr/bin/insmod
ldd: /usr/bin/insmod: No such file or directory
➜ ~ which insmod
/usr/sbin/insmod
➜ ~ ldd /usr/sbin/insmod
linux-vdso.so.1 (0x00007fffc4787000)
liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f86392e3000)
libz.so.1 => /lib64/libz.so.1 (0x00007f86390cd000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f8638eb5000)
libc.so.6 => /lib64/libc.so.6 (0x00007f8638af5000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f86388d9000)
/lib64/ld-linux-x86-64.so.2 (0x00005635a74e0000)

[Vishal Thanki]

Adding in the last email.

On Mon, Feb 29, 2016 at 12:23 PM, Vishal Thanki <vishal...@gmail.com> wrote:
> On Mon, Feb 29, 2016 at 10:13 AM, Viral Mehta <vira...@gmail.com> wrote:
>> Great to see post on this group.
>>
>> So, insmod takes care of uncompressing before loading ? Does it require lzo
>> library to be present ? or works without that as well ?
>>
>
> I think libz takes care of that, have not googled yet.
>
> ➜ ~ which kmod
> /usr/bin/kmod
> ➜ ~ ldd /usr/bin/kmod
> linux-vdso.so.1 (0x00007ffcb57bc000)
> liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fcbbfb37000)

^^
This is the library that handles XZ compression specifically.

[Viral Mehta]

Got it.

[Dhruval Shah]

Cool! Didn't knew about this!

Dhruval