lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 23 Mar 2010 19:03:42 -0700
From:	Matt Helsley <>
To:	Russell King - ARM Linux <>
Cc:	Christoffer Dall <>,
	Roland McGrath <>,
	containers <>,
	linux-kernel <>,
	linux-arm-kernel <>
Subject: Re: [C/R ARM][PATCH 1/3] ARM: Rudimentary syscall interfaces

On Tue, Mar 23, 2010 at 08:53:42PM +0000, Russell King - ARM Linux wrote:
> On Sun, Mar 21, 2010 at 09:06:03PM -0400, Christoffer Dall wrote:
> > This small commit introduces a global state of system calls for ARM
> > making it possible for a debugger or checkpointing to gain information
> > about another process' state with respect to system calls.
> I don't particularly like the idea that we always store the syscall
> number to memory for every system call, whether the stored version is
> used or not.
> Since ARM caches are generally not write allocate, this means mostly
> write-only variables can have a higher than expected expense.
> Is there not some thread flag which can be checked to see if we need to
> store the syscall number?

Perhaps before we freeze the task we can save the syscall number on ARM.
The patches suggest that the signal delivery path -- which the freezer
utilizes -- has the syscall number already.

Should work since the threads must be frozen first anyway.

	-Matt Helsley
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists