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truc
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Joined: 25 Jul 2005
Posts: 3199
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 Posted: Mon Aug 13, 2012 5:18 pm Post subject: initramfs problem: /bin/sh: blkid: permission denied[SOLVED] |
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Hello,
I'm desperate!  I've done this many times in the past but cannot make a simple initramfs working. my '/init is starting correctly (/bin/sh -> /bin/busybox(static)), but I can not run any other binary, i get the following message(this is for blkid, but I get similar messages for cryptsetup and lvm also included in the 'system')
| Code: | | /bin/sh: blkid: permission denied |
then I am back at the 'rescue shell' prompt, I still can't start any executables(other than busybox) and I don't see anything wrong with the permission which are as described in the file below
Here is some more information:
| Code: | $ ldd /sbin/blkid
linux-vdso.so.1 => (0x00007fff11fff000)
libblkid.so.1 => /lib/x86_64-linux-gnu/libblkid.so.1 (0x00007fe4e7c3b000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe4e78b4000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fe4e76ae000)
/lib64/ld-linux-x86-64.so.2 (0x00007fe4e7e7f000) |
| Quote: | # my initramfs definition
dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1
nod /dev/tty 0666 0 0 c 5 0
nod /dev/tty0 0660 0 0 c 4 0
nod /dev/null 0660 0 0 c 1 3
nod /dev/random 0666 0 0 c 1 8
nod /dev/urandom 0666 0 0 c 1 9
dir /root 0700 0 0
dir /etc 0700 0 0
dir /proc 0755 0 0
dir /sys 0755 0 0
dir /mnt 0755 0 0
dir /mnt/newroot 0755 0 0
dir /bin 0755 0 0
#dir /lib 0755 0 0
dir /sbin 0755 0 0
# init file!
file /init /home/samtech/linux-build/initramfs/init 0755 0 0
# busybox
file /bin/busybox /bin/busybox 0755 0 0
slink /bin/sh /bin/busybox 0777 0 0
slink /bin/mount /bin/busybox 0777 0 0
slink /bin/umount /bin/busybox 0777 0 0
slink /sbin/mdev /bin/busybox 0777 0 0
slink /sbin/switch_root /bin/busybox 0777 0 0
# executables
file /sbin/blkid /sbin/blkid 0755 0 0
file /sbin/cryptsetup /sbin/cryptsetup 0755 0 0
file /sbin/lvm /sbin/lvm 0755 0 0
slink /sbin/lvchange /sbin/lvm 0777 0 0
slink /sbin/vgscan /sbin/lvm 0777 0 0
# end of 'files.list.basic'
# libs
dir /lib64 0755 0 0
file /lib64/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2 0644 0 0
dir /lib 0755 0 0
file /lib/libcryptsetup.so.4 /lib/libcryptsetup.so.4 0644 0 0
dir /lib/x86_64-linux-gnu 0755 0 0
file /lib/x86_64-linux-gnu/libblkid.so.1 /lib/x86_64-linux-gnu/libblkid.so.1 0644 0 0
file /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6 0644 0 0
file /lib/x86_64-linux-gnu/libdevmapper-event.so.1.02.1 /lib/x86_64-linux-gnu/libdevmapper-event.so.1.02.1 0644 0 0
file /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1 /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1 0644 0 0
file /lib/x86_64-linux-gnu/libdl.so.2 /lib/x86_64-linux-gnu/libdl.so.2 0644 0 0
file /lib/x86_64-linux-gnu/libgcrypt.so.11 /lib/x86_64-linux-gnu/libgcrypt.so.11 0644 0 0
file /lib/x86_64-linux-gnu/libgpg-error.so.0 /lib/x86_64-linux-gnu/libgpg-error.so.0 0644 0 0
file /lib/x86_64-linux-gnu/libpopt.so.0 /lib/x86_64-linux-gnu/libpopt.so.0 0644 0 0
file /lib/x86_64-linux-gnu/libpthread.so.0 /lib/x86_64-linux-gnu/libpthread.so.0 0644 0 0
file /lib/x86_64-linux-gnu/libreadline.so.5 /lib/x86_64-linux-gnu/libreadline.so.5 0644 0 0
file /lib/x86_64-linux-gnu/librt.so.1 /lib/x86_64-linux-gnu/librt.so.1 0644 0 0
file /lib/x86_64-linux-gnu/libselinux.so.1 /lib/x86_64-linux-gnu/libselinux.so.1 0644 0 0
file /lib/x86_64-linux-gnu/libtinfo.so.5 /lib/x86_64-linux-gnu/libtinfo.so.5 0644 0 0
file /lib/x86_64-linux-gnu/libudev.so.0 /lib/x86_64-linux-gnu/libudev.so.0 0644 0 0
file /lib/x86_64-linux-gnu/libuuid.so.1 /lib/x86_64-linux-gnu/libuuid.so.1 0644 0 0
# for dynamic executables
file /etc/ld.so.cache /home/samtech/linux-build/initramfs/ld.so.cache 0644 0 0
file /etc/ld.so.conf /home/samtech/linux-build/initramfs/ld.so.conf 0644 0 0
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And this is the start of the /init script:
| Code: | #!/bin/sh
export PATH=/bin:/sbin
#crypted -> (sda4)
uuid_crypted=f14c1625-9e43-4041-9c22-c95c75eee308
root_dev=/dev/vg_tosh/lv_deb_root
rescue_shell() {
echo "Something went wrong. Dropping you to a shell."
busybox --install -s
exec /bin/sh
}
echo "mounting procfs&sysfs"
mount -t proc proc /proc
mount -t sysfs sysfs /sys
echo "populating /dev with mdev"
echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
dev_crypted=$(blkid -U "$uuid_crypted")
[ -z "$dev_crypted" ] && rescue_shell
echo "$uuid_crypted -> $dev_crypted"
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I stop here since the script doesn't go any further!
Last time I played with initramfs, I think I had static binaries, so the problem may be related to this.
| Code: | $ /sbin/ldconfig -C ld.so.cache -p
17 libs found in cache `ld.so.cache'
libuuid.so.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libuuid.so.1
libudev.so.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libudev.so.0
libtinfo.so.5 (libc6,x86-64) => /lib/x86_64-linux-gnu/libtinfo.so.5
libselinux.so.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libselinux.so.1
librt.so.1 (libc6,x86-64, OS ABI: Linux 2.6.26) => /lib/x86_64-linux-gnu/librt.so.1
libreadline.so.5 (libc6,x86-64) => /lib/x86_64-linux-gnu/libreadline.so.5
libpthread.so.0 (libc6,x86-64, OS ABI: Linux 2.6.26) => /lib/x86_64-linux-gnu/libpthread.so.0
libpopt.so.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libpopt.so.0
libgpg-error.so.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libgpg-error.so.0
libgcrypt.so.11 (libc6,x86-64) => /lib/x86_64-linux-gnu/libgcrypt.so.11
libdl.so.2 (libc6,x86-64, OS ABI: Linux 2.6.26) => /lib/x86_64-linux-gnu/libdl.so.2
libdevmapper.so.1.02.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1
libdevmapper-event.so.1.02.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libdevmapper-event.so.1.02.1
libcryptsetup.so.4 (libc6,x86-64) => /lib/libcryptsetup.so.4
libc.so.6 (libc6,x86-64, OS ABI: Linux 2.6.26) => /lib/x86_64-linux-gnu/libc.so.6
libblkid.so.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libblkid.so.1
ld-linux-x86-64.so.2 (libc6,x86-64) => /lib64/ld-linux-x86-64.so.2
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I read I can use UML to test initramfs, but I can't compile a ARCH=um linux! I am at the state where it feels like I'm not doing anything right. heeeelp! 
EDIT: I can build it, but can't run it!
EDIT2: ok, I can now run it, debug time! will post back if i find anything relevant:)
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Last edited by truc on Thu Nov 22, 2012 4:14 pm; edited 1 time in total |
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BitJam
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Joined: 12 Aug 2003
Posts: 2508
Location: Silver City, NM
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| Posted: Mon Oct 01, 2012 12:48 pm Post subject: |
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| Make sure ld-linux-x86-64.so.2 is executable. Use chmod a+x to make it so. |
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truc
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Joined: 25 Jul 2005
Posts: 3199
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| Posted: Tue Oct 02, 2012 1:27 pm Post subject: |
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| BitJam wrote: | | Make sure ld-linux-x86-64.so.2 is executable. Use chmod a+x to make it so. |
I've checked and it's not executable, that's probably my problem indeed! I can't test right now, but I will ASAP.
Thank you 
EDIT: for some reason, it is executable and working now(just started again from scratch), I don't know how it was back then.
Thanks!
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