On 23/10/22 22:32, Jason A. Donenfeld wrote:
This has nothing to do with random.c and everything to do with stack
protectors. Yes, it uses randomness. But many things use randomness.
random.h and random.c are concerned with the generation of randomness,
not with each and every use. So move this
On Mon Oct 24, 2022 at 12:17 AM CDT, Benjamin Gray wrote:
> On Mon, 2022-10-24 at 14:45 +1100, Russell Currey wrote:
> > On Fri, 2022-10-21 at 16:22 +1100, Benjamin Gray wrote:
> > > From: "Christopher M. Riedl"
> > >
-%<--
> > >
> > > ---
> >
> > Is the section following the --- your
Adds a local TLB flush operation that works given an mm_struct, VA to
flush, and page size representation. Most implementations mirror the
surrounding code. The book3s/32/tlbflush.h implementation is left as
a WARN_ONCE_ON because it is more complicated and not required for
anything as yet.
This
From: Jordan Niethe
For the coming temporary mm used for instruction patching, the
breakpoint registers need to be cleared to prevent them from
accidentally being triggered. As soon as the patching is done, the
breakpoints will be restored.
The breakpoint state is stored in the per-cpu variable
This is a revision of Chris and Jordan's series to introduce a per-cpu temporary
mm to be used for patching with strict rwx on radix mmus.
v9: * Fixed patch series name to include "on Radix MMU" again
* Renamed breakpoint functions
* Introduce patch to gracefully return when
BUG_ON() when failing to initialise the code patching window is
excessive, as most critical patching happens during boot before strict
RWX control is enabled. Failure to patch after boot is not inherently
fatal, so aborting the kernel is better determined by the caller.
The return value of
On Mon, 2022-10-10 at 11:29 +1100, Benjamin Gray wrote:
> > A function symbol may set a value in the st_other field to indicate
> > the TOC should be treated as caller-saved. The linker should
> > ensure> the
> > current TOC is saved before calling it and restore the TOC>
> > afterwards,
> > much
On Mon, 2022-10-24 at 14:20 +1100, Russell Currey wrote:
> On Fri, 2022-10-21 at 16:22 +1100, Benjamin Gray wrote:
> > diff --git a/arch/powerpc/lib/code-patching.c
> > b/arch/powerpc/lib/code-patching.c
> > index 34fc7ac34d91..9b9eba574d7e 100644
> > --- a/arch/powerpc/lib/code-patching.c
> > +++
From: "Christopher M. Riedl"
x86 supports the notion of a temporary mm which restricts access to
temporary PTEs to a single CPU. A temporary mm is useful for situations
where a CPU needs to perform sensitive operations (such as patching a
STRICT_KERNEL_RWX kernel) requiring temporary mappings
With the temp mm context support, there are CPU local variables to hold
the patch address and pte. Use these in the non-temp mm path as well
instead of adding a level of indirection through the text_poke_area
vm_struct and pointer chasing the pte.
As both paths use these fields now, there is no
Detect and abort __do_patch_instruction() when there is no text_poke_area,
which implies there is no patching address. This allows patch_instruction()
to fail gracefully and let the caller decide what to do, as opposed to
the current behaviour of kernel panicking when the null pointer is
Verifies that if the instruction patching did not return an error then
the value stored at the given address to patch is now equal to the
instruction we patched it to.
Signed-off-by: Benjamin Gray
---
arch/powerpc/lib/code-patching.c | 2 ++
1 file changed, 2 insertions(+)
diff --git
Stack frames used by syscall handlers support random offsets as of
commit f4a0318f278d (powerpc: add support for syscall stack randomization).
Implement the same for general interrupt handlers, by applying the
random stack offset and then updating this offset from within the
On Fri, Oct 21, 2022 at 09:43:58PM -0400, Jason A. Donenfeld wrote:
> Hey everyone,
>
> Here's the second and final tranche of tree-wide conversions to get
> random integer handling a bit tamer. It's predominantly another
> Coccinelle-based patchset.
>
> First we
We want to get rid of the old GPIO numberspace, so instead of
calling gpio_to_desc() we get the gpio descriptor for the requested
line from the device tree directly without passing through the
GPIO numberspace, and then we get the gpiochip from the descriptor.
Cc: Bartosz Golaszewski
Cc:
On Sun, Oct 23, 2022 at 05:07:13PM -0400, Theodore Ts'o wrote:
> On Fri, Oct 21, 2022 at 11:03:22PM -0700, Jakub Kicinski wrote:
> > On Sat, 22 Oct 2022 07:47:06 +0200 Jason A. Donenfeld wrote:
> > > On Fri, Oct 21, 2022 at 10:32:42PM -0700, Jakub Kicinski wrote:
> > > > But whatever. I mean -
Hi Benjamin,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on 8636df94ec917019c4cb744ba0a1f94cf9057790]
url:
https://github.com/intel-lab-lkp/linux/commits/Benjamin-Gray/Use-per-CPU-temporary-mappings-for-patching/20221021-133129
base:
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