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Full Discussion: Running bin file from a module
Top Forums Programming Running bin file from a module Post 302505611 by Corona688 on Thursday 17th of March 2011 12:06:04 PM
Old 03-17-2011
Quote:
Originally Posted by Chrisdot
Well, Corona688 I see you have very large knowledge about writing linux drivers
I've done enough work with them to know they are a severe challenge. I've occasionally had to alter some predefined values. I wrote a linux driver that prints 'hello world' to dmesg. I couldn't write a real driver yet.

But I know enough to tell you that windmills device drivers don't work that way. The kernel isn't going to reach into userspace, rip one function out of your userspace program, and run it raw because you don't get the same kind of stack; you don't get an ordinary heap; you don't get anything from libc; you don't get the same kind of files -- what does stderr even mean when you have no descriptor table? -- you don't get easy system calls like read() and write(); you don't even get easy, direct access to large amounts of available memory, and what memory there is is laid out in an alien way. The ease of all these things in userspace is a convincing illusion created by the kernel, more or less, and the way to use them is to be in userspace. Ordinary code can't run in kernel space any more than you could breathe in a vacuum.

Nearly all communication with the kernel is done through files and system calls instead. Your device driver can create a device file under /dev/ tied to your own kernel functions. someone opens it and your driver's read handler gets called, someone reads it and your device's read-handler gets called, etc. On boot, something in userspace could read from the ROM device and dump it into your special firmware-loading device file, and you'd be done.
Last edited by Corona688; 03-17-2011 at 01:15 PM..
This User Gave Thanks to Corona688 For This Post:
Chrisdot
 

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LEARN ABOUT CENTOS

pesign-client

PESIGN-CLIENT(1)					      General Commands Manual						  PESIGN-CLIENT(1)

NAME

       pesign-client - command line tool for signing UEFI applications

SYNOPSIS

       pesign [--in=infile | -i infile]
	      [--out=outfile | -o outfile]
	      [--export=exportfile | -e exportfile]
	      [--token=token | -t token]
	      [--certificate=nickname | -c nickname]
	      [--unlock | -u] [--kill | -k] [--sign | -s]
	      [--pinfd=pinfd | -f pinfd]
	      [--pinfile=pinfile | -F pinfile]

DESCRIPTION

       pesign is a command line tool for manipulating signatures and cryptographic digests of UEFI applications.

OPTIONS

       --unlock
	      Unlock  the  specified  token.   A PIN - specified by one of --pinfd, --pinfile, or the environmental variable PESIGN_TOKEN_PIN - is
	      required for this operation to succeed.  The PIN may be empty, if that is what is required for the token specified with --token.

       --pinfd=pinfd
	      When using --unlock, read the token's PIN from the open file descriptor pinfd.

       --pinfile=pinfile
	      When using --unlock, read the token's PIN from the file pinfile.

       --sign
	      Sign the binary specified by infile.

       --detached
	      When used with --sign, write the signature to outfile.

       --in=infile
	      When used with --sign, specify the input binary.

       --out=outfile
	      When used with --sign, specify output file.  If --detached is specified, this will be a  DER-formatted  signature.   Otherwise,  the
	      output will be the signed PE binary.

       --token=token
	      When used with --unlock or --sign, use the specified NSS token's certificate database.

       --certificate=nickname
	      When used with --sign, use the certificate database entry with the specified nickname for signing.

       --kill
	      Terminate the signing server.

SEE ALSO

       pesign(1)

AUTHORS

       Peter Jones

								  Mon Oct 15 2012						  PESIGN-CLIENT(1)
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