From: Guo Ren <guoren@kernel.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Alexandre Ghiti <alexandre.ghiti@canonical.com>,
Jonathan Corbet <corbet@lwn.net>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>, Zong Li <zong.li@sifive.com>,
Anup Patel <anup@brainfault.org>,
Atish Patra <Atish.Patra@rivosinc.com>,
Christoph Hellwig <hch@lst.de>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
Guo Ren <guoren@linux.alibaba.com>,
Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
Mayuresh Chitale <mchitale@ventanamicro.com>,
panqinglin2020@iscas.ac.cn,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>,
linux-efi <linux-efi@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [PATCH v3 12/13] riscv: Initialize thread pointer before calling C functions
Date: Mon, 20 Dec 2021 21:40:51 +0800 [thread overview]
Message-ID: <CAJF2gTR2pDN8vvknmE2s1nj2WSuCfTkXYkU074rCck+CCwQv7Q@mail.gmail.com> (raw)
In-Reply-To: <CAMj1kXHmdDKFozkoAfM-mxsxxfanhVq5HcA1qKTrkp=vAt=Umg@mail.gmail.com>
On Mon, Dec 20, 2021 at 5:17 PM Ard Biesheuvel <ardb@kernel.org> wrote:
>
> On Mon, 20 Dec 2021 at 10:11, Guo Ren <guoren@kernel.org> wrote:
> >
> > On Tue, Dec 7, 2021 at 11:55 AM Alexandre Ghiti
> > <alexandre.ghiti@canonical.com> wrote:
> > >
> > > Because of the stack canary feature that reads from the current task
> > > structure the stack canary value, the thread pointer register "tp" must
> > > be set before calling any C function from head.S: by chance, setup_vm
> > Shall we disable -fstack-protector for setup_vm() with __attribute__?
>
> Don't use __attribute__((optimize())) for that: it is known to be
> broken, and documented as debug purposes only in the GCC info pages:
>
> https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
Oh, thx for the link.
>
>
>
>
> > Actually, we've already init tp later.
> >
> > > and all the functions that it calls does not seem to be part of the
> > > functions where the canary check is done, but in the following commits,
> > > some functions will.
> > >
> > > Fixes: f2c9699f65557a31 ("riscv: Add STACKPROTECTOR supported")
> > > Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
> > > ---
> > > arch/riscv/kernel/head.S | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> > > index c3c0ed559770..86f7ee3d210d 100644
> > > --- a/arch/riscv/kernel/head.S
> > > +++ b/arch/riscv/kernel/head.S
> > > @@ -302,6 +302,7 @@ clear_bss_done:
> > > REG_S a0, (a2)
> > >
> > > /* Initialize page tables and relocate to virtual addresses */
> > > + la tp, init_task
> > > la sp, init_thread_union + THREAD_SIZE
> > > XIP_FIXUP_OFFSET sp
> > > #ifdef CONFIG_BUILTIN_DTB
> > > --
> > > 2.32.0
> > >
> >
> >
> > --
> > Best Regards
> > Guo Ren
> >
> > ML: https://lore.kernel.org/linux-csky/
--
Best Regards
Guo Ren
ML: https://lore.kernel.org/linux-csky/
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2021-12-20 13:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 10:46 [PATCH v3 00/13] Introduce sv48 support without relocatable kernel Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 01/13] riscv: Move KASAN mapping next to the kernel mapping Alexandre Ghiti
2021-12-06 16:18 ` Jisheng Zhang
2021-12-06 10:46 ` [PATCH v3 02/13] riscv: Split early kasan mapping to prepare sv48 introduction Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 03/13] riscv: Introduce functions to switch pt_ops Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 04/13] riscv: Allow to dynamically define VA_BITS Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 05/13] riscv: Get rid of MAXPHYSMEM configs Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 06/13] asm-generic: Prepare for riscv use of pud_alloc_one and pud_free Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 07/13] riscv: Implement sv48 support Alexandre Ghiti
2021-12-06 11:05 ` Alexandre ghiti
2021-12-09 4:32 ` 潘庆霖
2021-12-26 8:59 ` Jisheng Zhang
2022-01-04 12:44 ` Alexandre Ghiti
2021-12-29 3:42 ` Guo Ren
2022-01-04 12:42 ` Alexandre Ghiti
2022-04-26 5:57 ` Nick Kossifidis
2021-12-06 10:46 ` [PATCH v3 08/13] riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 09/13] riscv: Explicit comment about user virtual address space size Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 10/13] riscv: Improve virtual kernel memory layout dump Alexandre Ghiti
2021-12-09 4:18 ` 潘庆霖
2021-12-09 9:09 ` Alexandre ghiti
2021-12-06 10:46 ` [PATCH v3 11/13] Documentation: riscv: Add sv48 description to VM layout Alexandre Ghiti
2021-12-06 10:46 ` [PATCH v3 12/13] riscv: Initialize thread pointer before calling C functions Alexandre Ghiti
2021-12-20 9:11 ` Guo Ren
2021-12-20 9:17 ` Ard Biesheuvel
2021-12-20 13:40 ` Guo Ren [this message]
2022-01-10 8:03 ` Alexandre ghiti
2021-12-06 10:46 ` [PATCH v3 13/13] riscv: Allow user to downgrade to sv39 when hw supports sv48 if !KASAN Alexandre Ghiti
2021-12-06 11:08 ` [PATCH v3 00/13] Introduce sv48 support without relocatable kernel Alexandre ghiti
2022-01-20 4:18 ` Palmer Dabbelt
2022-01-20 7:30 ` Alexandre Ghiti
2022-01-20 10:05 ` Alexandre Ghiti
2022-02-18 10:45 ` Alexandre Ghiti
2022-04-01 12:56 ` Alexandre Ghiti
2022-04-23 1:50 ` Palmer Dabbelt
2022-06-02 3:43 ` Palmer Dabbelt
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=CAJF2gTR2pDN8vvknmE2s1nj2WSuCfTkXYkU074rCck+CCwQv7Q@mail.gmail.com \
--to=guoren@kernel.org \
--cc=Atish.Patra@rivosinc.com \
--cc=alexandre.ghiti@canonical.com \
--cc=andreyknvl@gmail.com \
--cc=anup@brainfault.org \
--cc=aou@eecs.berkeley.edu \
--cc=ardb@kernel.org \
--cc=arnd@arndb.de \
--cc=corbet@lwn.net \
--cc=dvyukov@google.com \
--cc=glider@google.com \
--cc=guoren@linux.alibaba.com \
--cc=hch@lst.de \
--cc=heinrich.schuchardt@canonical.com \
--cc=kasan-dev@googlegroups.com \
--cc=keescook@chromium.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=mchitale@ventanamicro.com \
--cc=palmer@dabbelt.com \
--cc=panqinglin2020@iscas.ac.cn \
--cc=paul.walmsley@sifive.com \
--cc=ryabinin.a.a@gmail.com \
--cc=zong.li@sifive.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).