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Root shell in system filesystem with GRUB
2019 Community Moderator ElectionHow does Linux deal with a separate /boot partition?installing grub and a working kernel over an old and broken debian systemGrub error: unknown filesystem. (all partitions are unknown)Read the UUID of a known partition into a variable in GRUBArch Linux: GRUB does not load after installationHow to format drive without losing grub?Grub won't boot from GPT RAID (gave up waiting for root device)Ubuntu Server 16.04.3LTS Squashfs as root from Grubgrub rescue ls – no partitions shown?Installing GRUB on an nvme drive
I'm learning about GRUB and, after search for a while, I tried to get a root shell changing the kernel load string:
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... ro single
to
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... rw single init=/bin/bash
It works and I get a root console. However, The filesystem mounted on "/" directory of this filesystem is not the filesystem mounted on the "original" system. I checked if it is a chroot but it isn't.
Could someone explain what is the filesystem mounted on / in this root shell?
How can I access to the original fs? I'm on Debian 7.
Thank you very much. Any help or any explanation would be nice.
EDIT
I notice that I get root access to a system filesystem (the fs mounted on the / partition). However, I would like to get into other partitions such as /home.
Explained:
I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However, fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do
debian shell linux-kernel grub2 grub
edited 11 hours ago
GAD3R
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm learning about GRUB and, after search for a while, I tried to get a root shell changing the kernel load string:
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... ro single
to
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... rw single init=/bin/bash
It works and I get a root console. However, The filesystem mounted on "/" directory of this filesystem is not the filesystem mounted on the "original" system. I checked if it is a chroot but it isn't.
Could someone explain what is the filesystem mounted on / in this root shell?
How can I access to the original fs? I'm on Debian 7.
Thank you very much. Any help or any explanation would be nice.
EDIT
I notice that I get root access to a system filesystem (the fs mounted on the / partition). However, I would like to get into other partitions such as /home.
Explained:
I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However, fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do
debian shell linux-kernel grub2 grub
edited 11 hours ago
GAD3R
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Whats your working directory when you get shell access? What is the results when you runls?
– kemotep
yesterday
@kemotep is the root directory and if I runlsI get all linux directories (/home, /var..)
– Miguel_sec
yesterday
2
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,fdisk -lcommand shows all partitions butdf -honly shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?
– Miguel_sec
yesterday
add a comment |
I'm learning about GRUB and, after search for a while, I tried to get a root shell changing the kernel load string:
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... ro single
to
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... rw single init=/bin/bash
It works and I get a root console. However, The filesystem mounted on "/" directory of this filesystem is not the filesystem mounted on the "original" system. I checked if it is a chroot but it isn't.
Could someone explain what is the filesystem mounted on / in this root shell?
How can I access to the original fs? I'm on Debian 7.
Thank you very much. Any help or any explanation would be nice.
EDIT
I notice that I get root access to a system filesystem (the fs mounted on the / partition). However, I would like to get into other partitions such as /home.
Explained:
I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However, fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do
debian shell linux-kernel grub2 grub
edited 11 hours ago
GAD3R
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm learning about GRUB and, after search for a while, I tried to get a root shell changing the kernel load string:
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... ro single
to
/boot/vmlinuz-4.9.0-8amd64 root=UUID=e8485edc.... rw single init=/bin/bash
It works and I get a root console. However, The filesystem mounted on "/" directory of this filesystem is not the filesystem mounted on the "original" system. I checked if it is a chroot but it isn't.
Could someone explain what is the filesystem mounted on / in this root shell?
How can I access to the original fs? I'm on Debian 7.
Thank you very much. Any help or any explanation would be nice.
EDIT
I notice that I get root access to a system filesystem (the fs mounted on the / partition). However, I would like to get into other partitions such as /home.
Explained:
I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However, fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do
debian shell linux-kernel grub2 grub
debian shell linux-kernel grub2 grub
edited 11 hours ago
GAD3R
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 11 hours ago
GAD3R
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 11 hours ago
GAD3R
27.3k1858113
edited 11 hours ago
GAD3R
27.3k1858113
edited 11 hours ago
GAD3R
27.3k1858113
27.3k1858113
asked yesterday
Miguel_secMiguel_sec
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Miguel_secMiguel_sec
133
asked yesterday
Miguel_secMiguel_sec
133
133
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Miguel_sec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Whats your working directory when you get shell access? What is the results when you runls?
– kemotep
yesterday
@kemotep is the root directory and if I runlsI get all linux directories (/home, /var..)
– Miguel_sec
yesterday
2
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,fdisk -lcommand shows all partitions butdf -honly shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?
– Miguel_sec
yesterday
add a comment |
Whats your working directory when you get shell access? What is the results when you runls?
– kemotep
yesterday
@kemotep is the root directory and if I runlsI get all linux directories (/home, /var..)
– Miguel_sec
yesterday
2
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,fdisk -lcommand shows all partitions butdf -honly shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?
– Miguel_sec
yesterday
Whats your working directory when you get shell access? What is the results when you run
ls?– kemotep
yesterday
Whats your working directory when you get shell access? What is the results when you run
ls?– kemotep
yesterday
@kemotep is the root directory and if I run
ls I get all linux directories (/home, /var..)– Miguel_sec
yesterday
@kemotep is the root directory and if I run
ls I get all linux directories (/home, /var..)– Miguel_sec
yesterday
2
2
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,
fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?– Miguel_sec
yesterday
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,
fdisk -l command shows all partitions but df -h only shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?– Miguel_sec
yesterday
add a comment |
1 Answer
1
active
oldest
votes
You can simply run
mount -a
to mount all the filesystems that your system would usually mount (ie. all the entries in /etc/fstab)
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be theyinit.d,systemdor something else entirely), which you overwrote withinit=/bin/bash.
– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
add a comment |
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1 Answer
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1 Answer
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active
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oldest
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active
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votes
You can simply run
mount -a
to mount all the filesystems that your system would usually mount (ie. all the entries in /etc/fstab)
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be theyinit.d,systemdor something else entirely), which you overwrote withinit=/bin/bash.
– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
add a comment |
You can simply run
mount -a
to mount all the filesystems that your system would usually mount (ie. all the entries in /etc/fstab)
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be theyinit.d,systemdor something else entirely), which you overwrote withinit=/bin/bash.
– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
add a comment |
You can simply run
mount -a
to mount all the filesystems that your system would usually mount (ie. all the entries in /etc/fstab)
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
You can simply run
mount -a
to mount all the filesystems that your system would usually mount (ie. all the entries in /etc/fstab)
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered yesterday
Entropy0Entropy0
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered yesterday
Entropy0Entropy0
562
answered yesterday
Entropy0Entropy0
562
562
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Entropy0 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be theyinit.d,systemdor something else entirely), which you overwrote withinit=/bin/bash.
– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
add a comment |
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be theyinit.d,systemdor something else entirely), which you overwrote withinit=/bin/bash.
– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
Can you believe that I was reloading webpage to say that I found the solution? Yep, that was the issue. I don't knwo why fs weren't mounted but that's it. Thanks!
– Miguel_sec
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be they
init.d, systemd or something else entirely), which you overwrote with init=/bin/bash.– Entropy0
yesterday
@Miguel_sec Wekk, they weren't loaded since that is usually done by your OS's init processes (be they
init.d, systemd or something else entirely), which you overwrote with init=/bin/bash.– Entropy0
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
Oh wait, thanks! I thought I understand it at 100% but I didn't. That is interesting :) Ty
– Miguel_sec
yesterday
add a comment |
Miguel_sec is a new contributor. Be nice, and check out our Code of Conduct.
Miguel_sec is a new contributor. Be nice, and check out our Code of Conduct.
Miguel_sec is a new contributor. Be nice, and check out our Code of Conduct.
Miguel_sec is a new contributor. Be nice, and check out our Code of Conduct.
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Whats your working directory when you get shell access? What is the results when you run
ls?– kemotep
yesterday
@kemotep is the root directory and if I run
lsI get all linux directories (/home, /var..)– Miguel_sec
yesterday
2
@GAD3R I think I don't have explained myself correctly. I have, for example, 5 partitions (/, /home, /var, /usr, swap). When I do the trick and I get a root shell, I get into / partition, so i'm not able to see what is in home partition. However,
fdisk -lcommand shows all partitions butdf -honly shows two fs of two of these partitions (/ and /usr). I would like to see what is in /home partition. What can I do?– Miguel_sec
yesterday