On Fri, Jul 24, 2020 at 10:05:08AM +0200, Jessica Yu wrote:
> +++ Jarkko Sakkinen [24/07/20 10:36 +0300]:
> > On Thu, Jul 23, 2020 at 03:42:09PM +0300, Ard Biesheuvel wrote:
> > > On Thu, 23 Jul 2020 at 04:52, Jarkko Sakkinen
> > > wrote:
> > > >
> > > > On Thu, Jul 16, 2020 at 06:49:09PM +0200,
+++ Jarkko Sakkinen [24/07/20 10:36 +0300]:
On Thu, Jul 23, 2020 at 03:42:09PM +0300, Ard Biesheuvel wrote:
On Thu, 23 Jul 2020 at 04:52, Jarkko Sakkinen
wrote:
>
> On Thu, Jul 16, 2020 at 06:49:09PM +0200, Christophe Leroy wrote:
> > Jarkko Sakkinen a écrit :
> >
> > > Rename module_alloc()
On Thu, Jul 23, 2020 at 03:42:09PM +0300, Ard Biesheuvel wrote:
> On Thu, 23 Jul 2020 at 04:52, Jarkko Sakkinen
> wrote:
> >
> > On Thu, Jul 16, 2020 at 06:49:09PM +0200, Christophe Leroy wrote:
> > > Jarkko Sakkinen a écrit :
> > >
> > > > Rename module_alloc() to text_alloc() and
On Thu, 23 Jul 2020 at 04:52, Jarkko Sakkinen
wrote:
>
> On Thu, Jul 16, 2020 at 06:49:09PM +0200, Christophe Leroy wrote:
> > Jarkko Sakkinen a écrit :
> >
> > > Rename module_alloc() to text_alloc() and module_memfree() to
> > > text_memfree(), and move them to kernel/text.c, which is
On Thu, Jul 16, 2020 at 06:49:09PM +0200, Christophe Leroy wrote:
> Jarkko Sakkinen a écrit :
>
> > Rename module_alloc() to text_alloc() and module_memfree() to
> > text_memfree(), and move them to kernel/text.c, which is unconditionally
> > compiled to the kernel proper. This allows kprobes,
Jarkko Sakkinen a écrit :
Rename module_alloc() to text_alloc() and module_memfree() to
text_memfree(), and move them to kernel/text.c, which is unconditionally
compiled to the kernel proper. This allows kprobes, ftrace and bpf to
allocate space for executable code without requiring to compile
From: Jarkko Sakkinen
> Sent: 14 July 2020 17:31
..
> There is one arch (nios2), which uses a regular kzalloc(). This means
> that both text_alloc() and text_memfree() need to be weaks symbols and
> nios2 needs to have overriding text.c to do its thing.
That could be handled by an arch-specific
On Tue, 14 Jul 2020 10:03:45 -0400
Steven Rostedt wrote:
> On Tue, 14 Jul 2020 14:33:14 +0100
> Mark Rutland wrote:
>
> > > Should work for all cases. Yes, we might then want something like a per
> > > arch:
> > >
> > > {BPF,FTRACE,KPROBE}_TEXT_TYPE
> >
> > ... at that point why not:
> >
On Tue, Jul 14, 2020 at 07:31:03PM +0300, Jarkko Sakkinen wrote:
> On Tue, Jul 14, 2020 at 03:01:09PM +0200, Peter Zijlstra wrote:
> > to help with text_alloc() usage in generic code, but I think
> > fundamentally, there's only these two options.
>
> There is one arch (nios2), which uses a
On Tue, Jul 14, 2020 at 03:01:09PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 14, 2020 at 03:19:24PM +0300, Ard Biesheuvel wrote:
> > So perhaps the answer is to have text_alloc() not with a 'where'
> > argument but with a 'why' argument. Or more simply, just have separate
> > alloc/free APIs for
On Tue, Jul 14, 2020 at 03:56:52PM +0200, Jessica Yu wrote:
> +++ Jarkko Sakkinen [14/07/20 12:45 +0300]:
> > Rename module_alloc() to text_alloc() and module_memfree() to
> > text_memfree(), and move them to kernel/text.c, which is unconditionally
> > compiled to the kernel proper. This allows
On Tue, Jul 14, 2020 at 03:01:09PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 14, 2020 at 03:19:24PM +0300, Ard Biesheuvel wrote:
> > So perhaps the answer is to have text_alloc() not with a 'where'
> > argument but with a 'why' argument. Or more simply, just have separate
> > alloc/free APIs for
On Tue, 14 Jul 2020 15:56:52 +0200
Jessica Yu wrote:
> As Ard and Will have already explained, the major issue I'm having
> with this is that we're taking module_alloc(), an allocator that was
> originally specific to module loading, and turning it into a generic
> interface to be used by other
On Tue, 14 Jul 2020 14:33:14 +0100
Mark Rutland wrote:
> > Should work for all cases. Yes, we might then want something like a per
> > arch:
> >
> > {BPF,FTRACE,KPROBE}_TEXT_TYPE
>
> ... at that point why not:
>
> text_alloc_ftrace();
> text_alloc_module();
> text_alloc_bpf();
>
+++ Jarkko Sakkinen [14/07/20 12:45 +0300]:
Rename module_alloc() to text_alloc() and module_memfree() to
text_memfree(), and move them to kernel/text.c, which is unconditionally
compiled to the kernel proper. This allows kprobes, ftrace and bpf to
allocate space for executable code without
On Tue, 14 Jul 2020 at 16:33, Mark Rutland wrote:
>
> On Tue, Jul 14, 2020 at 03:01:09PM +0200, Peter Zijlstra wrote:
> > On Tue, Jul 14, 2020 at 03:19:24PM +0300, Ard Biesheuvel wrote:
> > > So perhaps the answer is to have text_alloc() not with a 'where'
> > > argument but with a 'why'
On Tue, Jul 14, 2020 at 03:01:09PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 14, 2020 at 03:19:24PM +0300, Ard Biesheuvel wrote:
> > So perhaps the answer is to have text_alloc() not with a 'where'
> > argument but with a 'why' argument. Or more simply, just have separate
> > alloc/free APIs for
On Tue, Jul 14, 2020 at 03:19:24PM +0300, Ard Biesheuvel wrote:
> So perhaps the answer is to have text_alloc() not with a 'where'
> argument but with a 'why' argument. Or more simply, just have separate
> alloc/free APIs for each case, with generic versions that can be
> overridden by the
On Tue, Jul 14, 2020 at 01:29:27PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 14, 2020 at 11:28:27AM +0100, Will Deacon wrote:
>
> > As Ard says, module_alloc() _is_ special, in the sense that the virtual
> > memory it allocates wants to be close to the kernel text, whereas the
> > concept of
On Tue, 14 Jul 2020 at 14:31, Peter Zijlstra wrote:
>
> On Tue, Jul 14, 2020 at 11:28:27AM +0100, Will Deacon wrote:
>
> > As Ard says, module_alloc() _is_ special, in the sense that the virtual
> > memory it allocates wants to be close to the kernel text, whereas the
> > concept of allocating
On Tue, Jul 14, 2020 at 11:28:27AM +0100, Will Deacon wrote:
> As Ard says, module_alloc() _is_ special, in the sense that the virtual
> memory it allocates wants to be close to the kernel text, whereas the
> concept of allocating executable memory is broader and doesn't have these
>
On Tue, Jul 14, 2020 at 12:45:36PM +0300, Jarkko Sakkinen wrote:
> Rename module_alloc() to text_alloc() and module_memfree() to
> text_memfree(), and move them to kernel/text.c, which is unconditionally
> compiled to the kernel proper. This allows kprobes, ftrace and bpf to
> allocate space for
On Tue, Jul 14, 2020 at 12:45:36PM +0300, Jarkko Sakkinen wrote:
> Rename module_alloc() to text_alloc() and module_memfree() to
> text_memfree(), and move them to kernel/text.c, which is unconditionally
> compiled to the kernel proper. This allows kprobes, ftrace and bpf to
> allocate space for
Rename module_alloc() to text_alloc() and module_memfree() to
text_memfree(), and move them to kernel/text.c, which is unconditionally
compiled to the kernel proper. This allows kprobes, ftrace and bpf to
allocate space for executable code without requiring to compile the modules
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