Re: [linux-kernel] What is the difference between 'login: root' and 'su -' ?

[Peter Seiderer <Peter.Seiderer@ciselant.de>]

Hello,
I tried your tip, but it did not help in my case, sorry....
I do not think it is an easy ulimit case, see output of getrlimit(RLIMIT_FSIZE).
Cheers
Peter

On Thu, Nov 08, 2001 at 07:58:05AM +1300, Sartorelli, Kevin wrote:
> I struck the same error, and found it was a limit of the shell.  using
> bash and doing ulimit -f 10240000 (unlimited) fixed the problem for me.
> I think that if you su from one user to another, the underlying shell
> can still affect things (like ulimit).
> 
> Cheers
> Kevin
> 
> -----Original Message-----
> From: Peter Seiderer [mailto:Peter.Seiderer@ciselant.de]
> Sent: Thursday, 8 November 2001 6:47 a.m.
> To: linux-kernel@vger.kernel.org
> Subject: [linux-kernel] What is the difference between 'login: root' and
> 'su -' ?
> 
> 
> Hello,
> tried today to mkfs.ext2 a partition of my disk and detected there is
> a little difference between 'login: root' and 'su -'.
> 
> First I tried it this way:
> 
> 	Welcome to SuSE Linux 7.0 (i386) - Kernel 2.4.14 (tty1).
> 
> 	zodiak login: seiderer
> 	Password:
> 	seiderer@zodiak:~ > su -
> 	Password:
> 	zodiak:~ #
> 	zodiak:~ # mkfs.ext2 /dev/hdc4
> 	mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
> 	Filesystem label=
> 	OS type: Linux
> 	Block size=4096 (log=2)
> 	Fragment size=4096 (log=2)
> 	716672 inodes, 1432116 blocks
> 	71605 blocks (5.00%) reserved for the super user
> 	First data block=0
> 	44 block groups
> 	32768 blocks per group, 32768 fragments per group
> 	16288 inodes per group
> 	Superblock backups stored on blocks:
> 	        32768, 98304, 163840, 229376, 294912, 819200, 884736
> 
> 	Writing inode tables: 16/44File size limit exceeded
> 
> strace showed that write returned wit EFBIG and the process ended with
> SIGXFSZ:
> 
> 	write(1, "\10\10\10\10\10", 5)          = 5
> 	write(1, "16/44", 5)                    = 5
> 	_llseek(4, 18446744071562084352, [2147500032], SEEK_SET) = 0
> 	write(4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = -1
> EFBIG (File too large)
> 	--- SIGXFSZ (File size limit exceeded) ---
> 	+++ killed by SIGXFSZ +++
> 
> When login in directly from the console as root everything went right:
> 	Welcome to SuSE Linux 7.0 (i386) - Kernel 2.4.14 (tty1).
> 
> 	zodiak login: root
> 	Password:
> 	zodiak:~ # mkfs.ext2 /dev/hdc4
> 	mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
> 	Filesystem label=
> 	OS type: Linux
> 	Block size=4096 (log=2)
> 	Fragment size=4096 (log=2)
> 	716672 inodes, 1432116 blocks
> 	71605 blocks (5.00%) reserved for the super user
> 	First data block=0
> 	44 block groups
> 	32768 blocks per group, 32768 fragments per group
> 	16288 inodes per group
> 	Superblock backups stored on blocks:
> 	        32768, 98304, 163840, 229376, 294912, 819200, 884736
> 
> 	Writing inode tables: done
> 	Writing superblocks and filesystem accounting information: done
> 	zodiak:~ #
> 
> The RLIMIT_FSIZE showed in both cases the same values:
> getrlimit(RLIMIT_FSIZE) rlim_cur: 2147483647 rlim_max: 2147483647
> 
> Can anybody point me out what went wrong? Is it a kernel limit?
> 
> Peter
> 
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