I am using Red Hat sources, which has function open_kcore() hardcoded to
return -EPERM always.
Changing this function to the way it is defined in the public sources (as
shown below) did the trick.
open_kcore(struct inode * inode, struct file * filp)
{
return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
}
I am now able to use gdb to examine kernel symbols.
Uma.
Quoting UmaMaheswari Devi <[EMAIL PROTECTED]>:
I am new to kernel hacking and am facing problems in tryingstatic int
to peek at the
runtime values of some kernel variables using gdb.
I am issuing the gdb command as follows:
gdb vmlinux /proc/kcore
This displays the message
/proc/kcore: Operation not permitted
before the (gdb) prompt is displayed.
gdb then prints a value of 0 for any valid variable that is requested.
vmlinux appears to be OK, as gdb correctly identifies undefined variables.
The problem seems to be with /proc/kcore. This file has a permission
of 400. I
am using the Red Hat distribution.
Any help is appreciated. Thanks,
Uma.
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