LinuxPPC-Dev Archive on lore.kernel.org
 help / color / Atom feed
From: Jordan Niethe <jniethe5@gmail.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: ajd@linux.ibm.com, Nicholas Piggin <npiggin@gmail.com>,
	cmr@codefail.de, naveen.n.rao@linux.ibm.com,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Daniel Axtens <dja@axtens.net>
Subject: Re: [PATCH v10 03/10] powerpc: Always define MODULES_{VADDR,END}
Date: Wed, 21 Apr 2021 12:46:50 +1000
Message-ID: <CACzsE9oNQuymvv5FRUvzQ9uiytvFOcke5RsXA_urfKS1mtMnLg@mail.gmail.com> (raw)
In-Reply-To: <c4977cfb-6d9d-063e-b74b-ba0ffd9feaeb@csgroup.eu>

On Fri, Apr 2, 2021 at 12:36 AM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
>
>
>
> Le 30/03/2021 à 06:51, Jordan Niethe a écrit :
> > If MODULES_{VADDR,END} are not defined set them to VMALLOC_START and
> > VMALLOC_END respectively. This reduces the need for special cases. For
> > example, powerpc's module_alloc() was previously predicated on
> > MODULES_VADDR being defined but now is unconditionally defined.
> >
> > This will be useful reducing conditional code in other places that need
> > to allocate from the module region (i.e., kprobes).
> >
> > Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
> > ---
> > v10: New to series
> > ---
> >   arch/powerpc/include/asm/pgtable.h | 5 +++++
> >   arch/powerpc/kernel/module.c       | 5 +----
>
> You probably also have changes to do in kernel/ptdump.c
>
> In mm/book3s32/mmu.c and mm/kasan/kasan_init_32.c as well allthough that's harmless here.
>
> >   2 files changed, 6 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> > index 4eed82172e33..014c2921f26a 100644
> > --- a/arch/powerpc/include/asm/pgtable.h
> > +++ b/arch/powerpc/include/asm/pgtable.h
> > @@ -167,6 +167,11 @@ struct seq_file;
> >   void arch_report_meminfo(struct seq_file *m);
> >   #endif /* CONFIG_PPC64 */
> >
> > +#ifndef MODULES_VADDR
> > +#define MODULES_VADDR VMALLOC_START
> > +#define MODULES_END VMALLOC_END
> > +#endif
> > +
> >   #endif /* __ASSEMBLY__ */
> >
> >   #endif /* _ASM_POWERPC_PGTABLE_H */
> > diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c
> > index a211b0253cdb..f1fb58389d58 100644
> > --- a/arch/powerpc/kernel/module.c
> > +++ b/arch/powerpc/kernel/module.c
> > @@ -14,6 +14,7 @@
> >   #include <asm/firmware.h>
> >   #include <linux/sort.h>
> >   #include <asm/setup.h>
> > +#include <linux/mm.h>
> >
> >   static LIST_HEAD(module_bug_list);
> >
> > @@ -87,13 +88,9 @@ int module_finalize(const Elf_Ehdr *hdr,
> >       return 0;
> >   }
> >
> > -#ifdef MODULES_VADDR
> >   void *module_alloc(unsigned long size)
> >   {
> > -     BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
> > -
>
> The above check is needed somewhere, if you remove it from here you have to perform the check
> somewhere else.

This also introduces this warning:
fs/proc/kcore.c:626:52: warning: self-comparison always evaluates to
false [-Wtautological-compare]
  626 |  if (MODULES_VADDR != VMALLOC_START && MODULES_END != VMALLOC_END) {
I might leave this patch out of this series and use an #ifdef for now
and make this change separately as a follow up.

>
> >       return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL,
> >                                   PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
> >                                   __builtin_return_address(0));
> >   }
> > -#endif
> >

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30  4:51 [PATCH v10 00/10] powerpc: Further Strict RWX support Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 01/10] powerpc/mm: Implement set_memory() routines Jordan Niethe
2021-03-30  5:16   ` Christophe Leroy
2021-04-21  2:51     ` Jordan Niethe
2021-03-31 11:16   ` Michael Ellerman
2021-03-31 12:03     ` Christophe Leroy
2021-04-21  5:03     ` Jordan Niethe
2021-04-01  4:37   ` Aneesh Kumar K.V
2021-04-21  5:19     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 02/10] powerpc/lib/code-patching: Set up Strict RWX patching earlier Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 03/10] powerpc: Always define MODULES_{VADDR,END} Jordan Niethe
2021-03-30  5:00   ` Christophe Leroy
2021-04-01 13:36   ` Christophe Leroy
2021-04-21  2:46     ` Jordan Niethe [this message]
2021-04-21  5:14       ` Christophe Leroy
2021-04-21  5:22         ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 04/10] powerpc/kprobes: Mark newly allocated probes as ROX Jordan Niethe
2021-03-30  5:05   ` Christophe Leroy
2021-04-21  2:39     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 05/10] powerpc/bpf: Write protect JIT code Jordan Niethe
2021-03-31 10:37   ` Michael Ellerman
2021-03-31 10:39     ` Christophe Leroy
2021-04-21  2:35     ` Jordan Niethe
2021-04-21  6:51       ` Michael Ellerman
2021-03-30  4:51 ` [PATCH v10 06/10] powerpc/mm/ptdump: debugfs handler for W+X checks at runtime Jordan Niethe
2021-03-31 11:24   ` Michael Ellerman
2021-04-21  2:23     ` Jordan Niethe
2021-04-21  5:16       ` Christophe Leroy
2021-03-30  4:51 ` [PATCH v10 07/10] powerpc: Set ARCH_HAS_STRICT_MODULE_RWX Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 08/10] powerpc/configs: Enable STRICT_MODULE_RWX in skiroot_defconfig Jordan Niethe
2021-03-30  5:27   ` Christophe Leroy
2021-04-21  2:37     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 09/10] powerpc/mm: implement set_memory_attr() Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 10/10] powerpc/32: use set_memory_attr() Jordan Niethe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CACzsE9oNQuymvv5FRUvzQ9uiytvFOcke5RsXA_urfKS1mtMnLg@mail.gmail.com \
    --to=jniethe5@gmail.com \
    --cc=ajd@linux.ibm.com \
    --cc=christophe.leroy@csgroup.eu \
    --cc=cmr@codefail.de \
    --cc=dja@axtens.net \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=naveen.n.rao@linux.ibm.com \
    --cc=npiggin@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LinuxPPC-Dev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linuxppc-dev/0 linuxppc-dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linuxppc-dev linuxppc-dev/ https://lore.kernel.org/linuxppc-dev \
		linuxppc-dev@lists.ozlabs.org linuxppc-dev@ozlabs.org
	public-inbox-index linuxppc-dev

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.ozlabs.lists.linuxppc-dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git