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* [PATCH 1/2] Revert "riscv: Fixup static_obj() fail"
@ 2020-10-07 15:08 guoren
  2020-10-07 15:08 ` [PATCH 2/2] riscv: Fixup static_obj() fail v2 guoren
  2020-10-07 18:52 ` [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" Atish Patra
  0 siblings, 2 replies; 10+ messages in thread
From: guoren @ 2020-10-07 15:08 UTC (permalink / raw)
  To: palmerdabbelt
  Cc: Guo Ren, linux-kernel, schwab, atishp, linux-riscv, aurelien

From: Guo Ren <guoren@linux.alibaba.com>

This reverts commit 6184358da0004c8fd940afda6c0a0fa4027dc911.

It will cause bootup failure with HARDENED_USERCOPY.

As Aurelien has reported:

[    3.484586] AppArmor: AppArmor sha1 policy hashing enabled
[    4.749835] Freeing unused kernel memory: 492K
[    4.752017] Run /init as init process
[    4.753571] usercopy: Kernel memory overwrite attempt detected to kernel text (offset 507879, size 11)!
[    4.754838] ------------[ cut here ]------------
[    4.755651] kernel BUG at mm/usercopy.c:99!
[    4.756445] Kernel BUG [#1]
[    4.756815] Modules linked in:
[    4.757542] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.8.0-1-riscv64 #1 Debian 5.8.7-1
[    4.758372] epc: ffffffe0003b5120 ra : ffffffe0003b5120 sp : ffffffe07f783ca0
[    4.758960]  gp : ffffffe000cc7230 tp : ffffffe07f77cec0 t0 : ffffffe000cdafc0
[    4.759772]  t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffe07f783cf0
[    4.760534]  s1 : ffffffe00095d780 a0 : 000000000000005b a1 : 0000000000000020
[    4.761309]  a2 : 0000000000000005 a3 : 0000000000000000 a4 : ffffffe000c1f340
[    4.761848]  a5 : ffffffe000c1f340 a6 : 0000000000000000 a7 : 0000000000000087
[    4.762684]  s2 : ffffffe000941848 s3 : 000000000007bfe7 s4 : 000000000000000b
[    4.763500]  s5 : 0000000000000000 s6 : ffffffe00091cc00 s7 : fffffffffffff000
[    4.764376]  s8 : 0000003ffffff000 s9 : ffffffe0769f3200 s10: 000000000000000b
[    4.765208]  s11: ffffffe07d548c40 t3 : 0000000000000000 t4 : 000000000001dcd0
[    4.766059]  t5 : ffffffe000cc8510 t6 : ffffffe000cd64aa
[    4.766712] status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003
[    4.768308] ---[ end trace 1f8e733e834d4c3e ]---
[    4.769129] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    4.770070] SMP: stopping secondary CPUs
[    4.771110] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Atish Patra <atishp@atishpatra.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
---
 arch/riscv/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index f3586e3..e6f8016 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -22,7 +22,6 @@ SECTIONS
 	/* Beginning of code and text segment */
 	. = LOAD_OFFSET;
 	_start = .;
-	_stext = .;
 	HEAD_TEXT_SECTION
 	. = ALIGN(PAGE_SIZE);
 
@@ -55,6 +54,7 @@ SECTIONS
 	. = ALIGN(SECTION_ALIGN);
 	.text : {
 		_text = .;
+		_stext = .;
 		TEXT_TEXT
 		SCHED_TEXT
 		CPUIDLE_TEXT
-- 
2.7.4


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http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-07 15:08 [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" guoren
@ 2020-10-07 15:08 ` guoren
  2020-10-07 19:46   ` Atish Patra
  2020-10-08  3:54   ` Palmer Dabbelt
  2020-10-07 18:52 ` [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" Atish Patra
  1 sibling, 2 replies; 10+ messages in thread
From: guoren @ 2020-10-07 15:08 UTC (permalink / raw)
  To: palmerdabbelt
  Cc: Guo Ren, linux-kernel, schwab, atishp, linux-riscv, aurelien

From: Guo Ren <guoren@linux.alibaba.com>

v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
been reverted.

When enable LOCKDEP, static_obj() will cause error:

[    0.067192] INFO: trying to register non-static key.
[    0.067325] the code is fine but needs lockdep annotation.
[    0.067449] turning off the locking correctness validator.
[    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
[    0.067945] Call Trace:
[    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
[    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
[    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
[    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
[    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
[    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
[    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
[    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
[    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
[    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
[    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
[    0.069953] [<ffffffe000001092>] 0xffffffe000001092

Because some __initdata static variables is before _stext:

static int static_obj(const void *obj)
{
        unsigned long start = (unsigned long) &_stext,
                      end   = (unsigned long) &_end,
                      addr  = (unsigned long) obj;

        /*
         * static variable?
         */
        if ((addr >= start) && (addr < end))
                return 1;

	if (arch_is_kernel_data(addr))
		return 1;

We could implement arch_is_kernel_data to fixup it.

Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Atish Patra <atishp@atishpatra.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
---
 arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
 arch/riscv/kernel/setup.c         |  9 +++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 arch/riscv/include/asm/sections.h

diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
new file mode 100644
index 00000000..2317b9e
--- /dev/null
+++ b/arch/riscv/include/asm/sections.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ASM_RISCV_SECTIONS_H
+#define _ASM_RISCV_SECTIONS_H
+
+#define arch_is_kernel_data arch_is_kernel_data
+
+#include <asm-generic/sections.h>
+
+extern bool init_mem_is_free;
+
+static inline int arch_is_kernel_data(unsigned long addr)
+{
+	if (init_mem_is_free)
+		return 0;
+
+	return addr >= (unsigned long)__init_begin &&
+		addr < (unsigned long)__init_end;
+}
+#endif /* _ASM_RISCV_SECTIONS_H */
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 2c6dd32..9ebd5eb4 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -17,6 +17,7 @@
 #include <linux/sched/task.h>
 #include <linux/swiotlb.h>
 #include <linux/smp.h>
+#include <linux/poison.h>
 
 #include <asm/cpu_ops.h>
 #include <asm/setup.h>
@@ -112,3 +113,11 @@ static int __init topology_init(void)
 	return 0;
 }
 subsys_initcall(topology_init);
+
+bool init_mem_is_free = false;
+
+void free_initmem(void)
+{
+	free_initmem_default(POISON_FREE_INITMEM);
+	init_mem_is_free = true;
+}
-- 
2.7.4


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 1/2] Revert "riscv: Fixup static_obj() fail"
  2020-10-07 15:08 [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" guoren
  2020-10-07 15:08 ` [PATCH 2/2] riscv: Fixup static_obj() fail v2 guoren
@ 2020-10-07 18:52 ` Atish Patra
  1 sibling, 0 replies; 10+ messages in thread
From: Atish Patra @ 2020-10-07 18:52 UTC (permalink / raw)
  To: Guo Ren
  Cc: Guo Ren, Palmer Dabbelt, linux-kernel@vger.kernel.org List,
	Andreas Schwab, linux-riscv, aurelien

On Wed, Oct 7, 2020 at 8:09 AM <guoren@kernel.org> wrote:
>
> From: Guo Ren <guoren@linux.alibaba.com>
>
> This reverts commit 6184358da0004c8fd940afda6c0a0fa4027dc911.
>
> It will cause bootup failure with HARDENED_USERCOPY.
>
> As Aurelien has reported:
>
> [    3.484586] AppArmor: AppArmor sha1 policy hashing enabled
> [    4.749835] Freeing unused kernel memory: 492K
> [    4.752017] Run /init as init process
> [    4.753571] usercopy: Kernel memory overwrite attempt detected to kernel text (offset 507879, size 11)!
> [    4.754838] ------------[ cut here ]------------
> [    4.755651] kernel BUG at mm/usercopy.c:99!
> [    4.756445] Kernel BUG [#1]
> [    4.756815] Modules linked in:
> [    4.757542] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.8.0-1-riscv64 #1 Debian 5.8.7-1
> [    4.758372] epc: ffffffe0003b5120 ra : ffffffe0003b5120 sp : ffffffe07f783ca0
> [    4.758960]  gp : ffffffe000cc7230 tp : ffffffe07f77cec0 t0 : ffffffe000cdafc0
> [    4.759772]  t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffe07f783cf0
> [    4.760534]  s1 : ffffffe00095d780 a0 : 000000000000005b a1 : 0000000000000020
> [    4.761309]  a2 : 0000000000000005 a3 : 0000000000000000 a4 : ffffffe000c1f340
> [    4.761848]  a5 : ffffffe000c1f340 a6 : 0000000000000000 a7 : 0000000000000087
> [    4.762684]  s2 : ffffffe000941848 s3 : 000000000007bfe7 s4 : 000000000000000b
> [    4.763500]  s5 : 0000000000000000 s6 : ffffffe00091cc00 s7 : fffffffffffff000
> [    4.764376]  s8 : 0000003ffffff000 s9 : ffffffe0769f3200 s10: 000000000000000b
> [    4.765208]  s11: ffffffe07d548c40 t3 : 0000000000000000 t4 : 000000000001dcd0
> [    4.766059]  t5 : ffffffe000cc8510 t6 : ffffffe000cd64aa
> [    4.766712] status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003
> [    4.768308] ---[ end trace 1f8e733e834d4c3e ]---
> [    4.769129] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> [    4.770070] SMP: stopping secondary CPUs
> [    4.771110] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---
>
> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> Cc: Atish Patra <atishp@atishpatra.org>
> Cc: Andreas Schwab <schwab@linux-m68k.org>
> ---
>  arch/riscv/kernel/vmlinux.lds.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
> index f3586e3..e6f8016 100644
> --- a/arch/riscv/kernel/vmlinux.lds.S
> +++ b/arch/riscv/kernel/vmlinux.lds.S
> @@ -22,7 +22,6 @@ SECTIONS
>         /* Beginning of code and text segment */
>         . = LOAD_OFFSET;
>         _start = .;
> -       _stext = .;
>         HEAD_TEXT_SECTION
>         . = ALIGN(PAGE_SIZE);
>
> @@ -55,6 +54,7 @@ SECTIONS
>         . = ALIGN(SECTION_ALIGN);
>         .text : {
>                 _text = .;
> +               _stext = .;
>                 TEXT_TEXT
>                 SCHED_TEXT
>                 CPUIDLE_TEXT
> --
> 2.7.4
>

Reviewed-by: Atish Patra <atish.patra@wdc.com>

-- 
Regards,
Atish

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-07 15:08 ` [PATCH 2/2] riscv: Fixup static_obj() fail v2 guoren
@ 2020-10-07 19:46   ` Atish Patra
  2020-10-08  2:30     ` Guo Ren
  2020-10-08  3:54   ` Palmer Dabbelt
  1 sibling, 1 reply; 10+ messages in thread
From: Atish Patra @ 2020-10-07 19:46 UTC (permalink / raw)
  To: Guo Ren
  Cc: Guo Ren, Palmer Dabbelt, linux-kernel@vger.kernel.org List,
	Andreas Schwab, linux-riscv, aurelien

On Wed, Oct 7, 2020 at 8:09 AM <guoren@kernel.org> wrote:
>
> From: Guo Ren <guoren@linux.alibaba.com>
>
> v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> been reverted.
>
> When enable LOCKDEP, static_obj() will cause error:
>
> [    0.067192] INFO: trying to register non-static key.
> [    0.067325] the code is fine but needs lockdep annotation.
> [    0.067449] turning off the locking correctness validator.
> [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> [    0.067945] Call Trace:
> [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
>
> Because some __initdata static variables is before _stext:
>
> static int static_obj(const void *obj)
> {
>         unsigned long start = (unsigned long) &_stext,
>                       end   = (unsigned long) &_end,
>                       addr  = (unsigned long) obj;
>
>         /*
>          * static variable?
>          */
>         if ((addr >= start) && (addr < end))
>                 return 1;
>
>         if (arch_is_kernel_data(addr))
>                 return 1;
>
> We could implement arch_is_kernel_data to fixup it.
>
> Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> Cc: Atish Patra <atishp@atishpatra.org>
> Cc: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> ---
>  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
>  arch/riscv/kernel/setup.c         |  9 +++++++++
>  2 files changed, 29 insertions(+)
>  create mode 100644 arch/riscv/include/asm/sections.h
>
> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> new file mode 100644
> index 00000000..2317b9e
> --- /dev/null
> +++ b/arch/riscv/include/asm/sections.h

You may want to rebase it on top of for-next as UEFI series also adds this file.
.

> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef _ASM_RISCV_SECTIONS_H
> +#define _ASM_RISCV_SECTIONS_H
> +
> +#define arch_is_kernel_data arch_is_kernel_data
> +
> +#include <asm-generic/sections.h>
> +
> +extern bool init_mem_is_free;
> +
> +static inline int arch_is_kernel_data(unsigned long addr)
> +{
> +       if (init_mem_is_free)
> +               return 0;
> +
> +       return addr >= (unsigned long)__init_begin &&
> +               addr < (unsigned long)__init_end;
> +}
> +#endif /* _ASM_RISCV_SECTIONS_H */
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 2c6dd32..9ebd5eb4 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -17,6 +17,7 @@
>  #include <linux/sched/task.h>
>  #include <linux/swiotlb.h>
>  #include <linux/smp.h>
> +#include <linux/poison.h>
>
>  #include <asm/cpu_ops.h>
>  #include <asm/setup.h>
> @@ -112,3 +113,11 @@ static int __init topology_init(void)
>         return 0;
>  }
>  subsys_initcall(topology_init);
> +
> +bool init_mem_is_free = false;
> +
> +void free_initmem(void)
> +{
> +       free_initmem_default(POISON_FREE_INITMEM);
> +       init_mem_is_free = true;
> +}
> --
> 2.7.4
>

Looks good. Much cleaner than the first approach.
FYI: I am still looking into separating __init text & data so that
different permissions can be applied to them.
With this patch, we can just separate it on top of _stext.


Reviewed-by: Atish Patra <atish.patra@wdc.com>

-- 
Regards,
Atish

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-07 19:46   ` Atish Patra
@ 2020-10-08  2:30     ` Guo Ren
  0 siblings, 0 replies; 10+ messages in thread
From: Guo Ren @ 2020-10-08  2:30 UTC (permalink / raw)
  To: Atish Patra
  Cc: Guo Ren, Palmer Dabbelt, linux-kernel@vger.kernel.org List,
	Andreas Schwab, linux-riscv, aurelien

On Thu, Oct 8, 2020 at 3:46 AM Atish Patra <atishp@atishpatra.org> wrote:
>
> On Wed, Oct 7, 2020 at 8:09 AM <guoren@kernel.org> wrote:
> >
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> > been reverted.
> >
> > When enable LOCKDEP, static_obj() will cause error:
> >
> > [    0.067192] INFO: trying to register non-static key.
> > [    0.067325] the code is fine but needs lockdep annotation.
> > [    0.067449] turning off the locking correctness validator.
> > [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> > [    0.067945] Call Trace:
> > [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> > [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> > [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> > [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> > [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> > [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> > [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> > [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> > [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> > [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> > [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> > [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
> >
> > Because some __initdata static variables is before _stext:
> >
> > static int static_obj(const void *obj)
> > {
> >         unsigned long start = (unsigned long) &_stext,
> >                       end   = (unsigned long) &_end,
> >                       addr  = (unsigned long) obj;
> >
> >         /*
> >          * static variable?
> >          */
> >         if ((addr >= start) && (addr < end))
> >                 return 1;
> >
> >         if (arch_is_kernel_data(addr))
> >                 return 1;
> >
> > We could implement arch_is_kernel_data to fixup it.
> >
> > Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> > Cc: Atish Patra <atishp@atishpatra.org>
> > Cc: Andreas Schwab <schwab@linux-m68k.org>
> > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > ---
> >  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
> >  arch/riscv/kernel/setup.c         |  9 +++++++++
> >  2 files changed, 29 insertions(+)
> >  create mode 100644 arch/riscv/include/asm/sections.h
> >
> > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> > new file mode 100644
> > index 00000000..2317b9e
> > --- /dev/null
> > +++ b/arch/riscv/include/asm/sections.h
>
> You may want to rebase it on top of for-next as UEFI series also adds this file.
ok

> .
>
> > @@ -0,0 +1,20 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +
> > +#ifndef _ASM_RISCV_SECTIONS_H
> > +#define _ASM_RISCV_SECTIONS_H
> > +
> > +#define arch_is_kernel_data arch_is_kernel_data
> > +
> > +#include <asm-generic/sections.h>
> > +
> > +extern bool init_mem_is_free;
> > +
> > +static inline int arch_is_kernel_data(unsigned long addr)
> > +{
> > +       if (init_mem_is_free)
> > +               return 0;
> > +
> > +       return addr >= (unsigned long)__init_begin &&
> > +               addr < (unsigned long)__init_end;
> > +}
> > +#endif /* _ASM_RISCV_SECTIONS_H */
> > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > index 2c6dd32..9ebd5eb4 100644
> > --- a/arch/riscv/kernel/setup.c
> > +++ b/arch/riscv/kernel/setup.c
> > @@ -17,6 +17,7 @@
> >  #include <linux/sched/task.h>
> >  #include <linux/swiotlb.h>
> >  #include <linux/smp.h>
> > +#include <linux/poison.h>
> >
> >  #include <asm/cpu_ops.h>
> >  #include <asm/setup.h>
> > @@ -112,3 +113,11 @@ static int __init topology_init(void)
> >         return 0;
> >  }
> >  subsys_initcall(topology_init);
> > +
> > +bool init_mem_is_free = false;
> > +
> > +void free_initmem(void)
> > +{
> > +       free_initmem_default(POISON_FREE_INITMEM);
> > +       init_mem_is_free = true;
> > +}
> > --
> > 2.7.4
> >
>
> Looks good. Much cleaner than the first approach.
> FYI: I am still looking into separating __init text & data so that
> different permissions can be applied to them.
> With this patch, we can just separate it on top of _stext.
>
>
> Reviewed-by: Atish Patra <atish.patra@wdc.com>
>
> --
> Regards,
> Atish



-- 
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

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-07 15:08 ` [PATCH 2/2] riscv: Fixup static_obj() fail v2 guoren
  2020-10-07 19:46   ` Atish Patra
@ 2020-10-08  3:54   ` Palmer Dabbelt
  2020-10-08 17:57     ` Atish Patra
  2020-10-09  1:53     ` Guo Ren
  1 sibling, 2 replies; 10+ messages in thread
From: Palmer Dabbelt @ 2020-10-08  3:54 UTC (permalink / raw)
  To: guoren; +Cc: guoren, linux-kernel, schwab, atishp, linux-riscv, aurelien

On Wed, 07 Oct 2020 08:08:33 PDT (-0700), guoren@kernel.org wrote:
> From: Guo Ren <guoren@linux.alibaba.com>
>
> v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> been reverted.
>
> When enable LOCKDEP, static_obj() will cause error:
>
> [    0.067192] INFO: trying to register non-static key.
> [    0.067325] the code is fine but needs lockdep annotation.
> [    0.067449] turning off the locking correctness validator.
> [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> [    0.067945] Call Trace:
> [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
>
> Because some __initdata static variables is before _stext:
>
> static int static_obj(const void *obj)
> {
>         unsigned long start = (unsigned long) &_stext,
>                       end   = (unsigned long) &_end,
>                       addr  = (unsigned long) obj;
>
>         /*
>          * static variable?
>          */
>         if ((addr >= start) && (addr < end))
>                 return 1;
>
> 	if (arch_is_kernel_data(addr))
> 		return 1;
>
> We could implement arch_is_kernel_data to fixup it.
>
> Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> Cc: Atish Patra <atishp@atishpatra.org>
> Cc: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> ---
>  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
>  arch/riscv/kernel/setup.c         |  9 +++++++++
>  2 files changed, 29 insertions(+)
>  create mode 100644 arch/riscv/include/asm/sections.h
>
> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> new file mode 100644
> index 00000000..2317b9e
> --- /dev/null
> +++ b/arch/riscv/include/asm/sections.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef _ASM_RISCV_SECTIONS_H
> +#define _ASM_RISCV_SECTIONS_H
> +
> +#define arch_is_kernel_data arch_is_kernel_data
> +
> +#include <asm-generic/sections.h>
> +
> +extern bool init_mem_is_free;
> +
> +static inline int arch_is_kernel_data(unsigned long addr)
> +{
> +	if (init_mem_is_free)
> +		return 0;
> +
> +	return addr >= (unsigned long)__init_begin &&
> +		addr < (unsigned long)__init_end;
> +}
> +#endif /* _ASM_RISCV_SECTIONS_H */
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 2c6dd32..9ebd5eb4 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -17,6 +17,7 @@
>  #include <linux/sched/task.h>
>  #include <linux/swiotlb.h>
>  #include <linux/smp.h>
> +#include <linux/poison.h>
>
>  #include <asm/cpu_ops.h>
>  #include <asm/setup.h>
> @@ -112,3 +113,11 @@ static int __init topology_init(void)
>  	return 0;
>  }
>  subsys_initcall(topology_init);
> +
> +bool init_mem_is_free = false;
> +
> +void free_initmem(void)
> +{
> +	free_initmem_default(POISON_FREE_INITMEM);
> +	init_mem_is_free = true;
> +}

I'm a bit confused as to what you're trying to do here.  Yesterday I got
another version of this patch set that moves init data around, today a
different one.  Yesterday's is tested and simpler, and given it's so late in
the process I'm inclined to take that as I don't want to break anything.

Right now I have

84814460eef9 ("riscv: Fixup bootup failure with HARDENED_USERCOPY")
a78c6f5956a9 ("RISC-V: Make sure memblock reserves the memory containing DT")
549738f15da0 ("Linux 5.9-rc8")

Unless there's some functional bug, that's what I'm going to send out for 5.9
-- I'm not all that worried about lacking the ability to free init data.  The
above seems like fine 5.10 material.

Let me know if I'm missing something here.

_______________________________________________
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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-08  3:54   ` Palmer Dabbelt
@ 2020-10-08 17:57     ` Atish Patra
  2020-10-09  1:53     ` Guo Ren
  1 sibling, 0 replies; 10+ messages in thread
From: Atish Patra @ 2020-10-08 17:57 UTC (permalink / raw)
  To: Palmer Dabbelt
  Cc: Guo Ren, linux-kernel@vger.kernel.org List, Andreas Schwab,
	Guo Ren, linux-riscv, aurelien

On Wed, Oct 7, 2020 at 8:54 PM Palmer Dabbelt <palmerdabbelt@google.com> wrote:
>
> On Wed, 07 Oct 2020 08:08:33 PDT (-0700), guoren@kernel.org wrote:
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> > been reverted.
> >
> > When enable LOCKDEP, static_obj() will cause error:
> >
> > [    0.067192] INFO: trying to register non-static key.
> > [    0.067325] the code is fine but needs lockdep annotation.
> > [    0.067449] turning off the locking correctness validator.
> > [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> > [    0.067945] Call Trace:
> > [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> > [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> > [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> > [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> > [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> > [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> > [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> > [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> > [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> > [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> > [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> > [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
> >
> > Because some __initdata static variables is before _stext:
> >
> > static int static_obj(const void *obj)
> > {
> >         unsigned long start = (unsigned long) &_stext,
> >                       end   = (unsigned long) &_end,
> >                       addr  = (unsigned long) obj;
> >
> >         /*
> >          * static variable?
> >          */
> >         if ((addr >= start) && (addr < end))
> >                 return 1;
> >
> >       if (arch_is_kernel_data(addr))
> >               return 1;
> >
> > We could implement arch_is_kernel_data to fixup it.
> >
> > Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> > Cc: Atish Patra <atishp@atishpatra.org>
> > Cc: Andreas Schwab <schwab@linux-m68k.org>
> > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > ---
> >  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
> >  arch/riscv/kernel/setup.c         |  9 +++++++++
> >  2 files changed, 29 insertions(+)
> >  create mode 100644 arch/riscv/include/asm/sections.h
> >
> > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> > new file mode 100644
> > index 00000000..2317b9e
> > --- /dev/null
> > +++ b/arch/riscv/include/asm/sections.h
> > @@ -0,0 +1,20 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +
> > +#ifndef _ASM_RISCV_SECTIONS_H
> > +#define _ASM_RISCV_SECTIONS_H
> > +
> > +#define arch_is_kernel_data arch_is_kernel_data
> > +
> > +#include <asm-generic/sections.h>
> > +
> > +extern bool init_mem_is_free;
> > +
> > +static inline int arch_is_kernel_data(unsigned long addr)
> > +{
> > +     if (init_mem_is_free)
> > +             return 0;
> > +
> > +     return addr >= (unsigned long)__init_begin &&
> > +             addr < (unsigned long)__init_end;
> > +}
> > +#endif /* _ASM_RISCV_SECTIONS_H */
> > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > index 2c6dd32..9ebd5eb4 100644
> > --- a/arch/riscv/kernel/setup.c
> > +++ b/arch/riscv/kernel/setup.c
> > @@ -17,6 +17,7 @@
> >  #include <linux/sched/task.h>
> >  #include <linux/swiotlb.h>
> >  #include <linux/smp.h>
> > +#include <linux/poison.h>
> >
> >  #include <asm/cpu_ops.h>
> >  #include <asm/setup.h>
> > @@ -112,3 +113,11 @@ static int __init topology_init(void)
> >       return 0;
> >  }
> >  subsys_initcall(topology_init);
> > +
> > +bool init_mem_is_free = false;
> > +
> > +void free_initmem(void)
> > +{
> > +     free_initmem_default(POISON_FREE_INITMEM);
> > +     init_mem_is_free = true;
> > +}
>
> I'm a bit confused as to what you're trying to do here.  Yesterday I got
> another version of this patch set that moves init data around, today a
> different one.  Yesterday's is tested and simpler, and given it's so late in
> the process I'm inclined to take that as I don't want to break anything.
>

I agree. This version will have some more conflicts with other patches
and it's too late in cycle.
It's best to merge it in 5.10.

> Right now I have
>
> 84814460eef9 ("riscv: Fixup bootup failure with HARDENED_USERCOPY")
> a78c6f5956a9 ("RISC-V: Make sure memblock reserves the memory containing DT")
> 549738f15da0 ("Linux 5.9-rc8")
>
> Unless there's some functional bug, that's what I'm going to send out for 5.9
> -- I'm not all that worried about lacking the ability to free init data.  The
> above seems like fine 5.10 material.
>
> Let me know if I'm missing something here.



-- 
Regards,
Atish

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-08  3:54   ` Palmer Dabbelt
  2020-10-08 17:57     ` Atish Patra
@ 2020-10-09  1:53     ` Guo Ren
  2020-10-09 21:16       ` Atish Patra
  1 sibling, 1 reply; 10+ messages in thread
From: Guo Ren @ 2020-10-09  1:53 UTC (permalink / raw)
  To: Palmer Dabbelt
  Cc: Guo Ren, Linux Kernel Mailing List, Andreas Schwab, Atish Patra,
	linux-riscv, aurelien

On Thu, Oct 8, 2020 at 11:54 AM Palmer Dabbelt <palmerdabbelt@google.com> wrote:
>
> On Wed, 07 Oct 2020 08:08:33 PDT (-0700), guoren@kernel.org wrote:
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> > been reverted.
> >
> > When enable LOCKDEP, static_obj() will cause error:
> >
> > [    0.067192] INFO: trying to register non-static key.
> > [    0.067325] the code is fine but needs lockdep annotation.
> > [    0.067449] turning off the locking correctness validator.
> > [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> > [    0.067945] Call Trace:
> > [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> > [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> > [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> > [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> > [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> > [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> > [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> > [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> > [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> > [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> > [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> > [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
> >
> > Because some __initdata static variables is before _stext:
> >
> > static int static_obj(const void *obj)
> > {
> >         unsigned long start = (unsigned long) &_stext,
> >                       end   = (unsigned long) &_end,
> >                       addr  = (unsigned long) obj;
> >
> >         /*
> >          * static variable?
> >          */
> >         if ((addr >= start) && (addr < end))
> >                 return 1;
> >
> >       if (arch_is_kernel_data(addr))
> >               return 1;
> >
> > We could implement arch_is_kernel_data to fixup it.
> >
> > Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> > Cc: Atish Patra <atishp@atishpatra.org>
> > Cc: Andreas Schwab <schwab@linux-m68k.org>
> > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > ---
> >  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
> >  arch/riscv/kernel/setup.c         |  9 +++++++++
> >  2 files changed, 29 insertions(+)
> >  create mode 100644 arch/riscv/include/asm/sections.h
> >
> > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> > new file mode 100644
> > index 00000000..2317b9e
> > --- /dev/null
> > +++ b/arch/riscv/include/asm/sections.h
> > @@ -0,0 +1,20 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +
> > +#ifndef _ASM_RISCV_SECTIONS_H
> > +#define _ASM_RISCV_SECTIONS_H
> > +
> > +#define arch_is_kernel_data arch_is_kernel_data
> > +
> > +#include <asm-generic/sections.h>
> > +
> > +extern bool init_mem_is_free;
> > +
> > +static inline int arch_is_kernel_data(unsigned long addr)
> > +{
> > +     if (init_mem_is_free)
> > +             return 0;
> > +
> > +     return addr >= (unsigned long)__init_begin &&
> > +             addr < (unsigned long)__init_end;
> > +}
> > +#endif /* _ASM_RISCV_SECTIONS_H */
> > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > index 2c6dd32..9ebd5eb4 100644
> > --- a/arch/riscv/kernel/setup.c
> > +++ b/arch/riscv/kernel/setup.c
> > @@ -17,6 +17,7 @@
> >  #include <linux/sched/task.h>
> >  #include <linux/swiotlb.h>
> >  #include <linux/smp.h>
> > +#include <linux/poison.h>
> >
> >  #include <asm/cpu_ops.h>
> >  #include <asm/setup.h>
> > @@ -112,3 +113,11 @@ static int __init topology_init(void)
> >       return 0;
> >  }
> >  subsys_initcall(topology_init);
> > +
> > +bool init_mem_is_free = false;
> > +
> > +void free_initmem(void)
> > +{
> > +     free_initmem_default(POISON_FREE_INITMEM);
> > +     init_mem_is_free = true;
> > +}
>
> I'm a bit confused as to what you're trying to do here.  Yesterday I got
> another version of this patch set that moves init data around, today a
> different one.  Yesterday's is tested and simpler, and given it's so late in
> the process I'm inclined to take that as I don't want to break anything.
>
> Right now I have
>
> 84814460eef9 ("riscv: Fixup bootup failure with HARDENED_USERCOPY")
> a78c6f5956a9 ("RISC-V: Make sure memblock reserves the memory containing DT")
> 549738f15da0 ("Linux 5.9-rc8")
>
> Unless there's some functional bug, that's what I'm going to send out for 5.9
> -- I'm not all that worried about lacking the ability to free init data.  The
> above seems like fine 5.10 material.
>
> Let me know if I'm missing something here.
84814460eef9 could resolve the problem and Atish ask for any other
idea? So It's another choice, I forgot RFC in prefix.

6184358da0004c8fd940afda6c0a0fa4027dc911("riscv: Fixup static_obj()
fail") is a sloppy patch that introduces another problem. Sorry about
that.

-- 
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

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-09  1:53     ` Guo Ren
@ 2020-10-09 21:16       ` Atish Patra
  2020-10-09 21:23         ` Palmer Dabbelt
  0 siblings, 1 reply; 10+ messages in thread
From: Atish Patra @ 2020-10-09 21:16 UTC (permalink / raw)
  To: Guo Ren
  Cc: Guo Ren, Palmer Dabbelt, Linux Kernel Mailing List,
	Andreas Schwab, linux-riscv, aurelien

On Thu, Oct 8, 2020 at 6:53 PM Guo Ren <guoren@kernel.org> wrote:
>
> On Thu, Oct 8, 2020 at 11:54 AM Palmer Dabbelt <palmerdabbelt@google.com> wrote:
> >
> > On Wed, 07 Oct 2020 08:08:33 PDT (-0700), guoren@kernel.org wrote:
> > > From: Guo Ren <guoren@linux.alibaba.com>
> > >
> > > v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
> > > been reverted.
> > >
> > > When enable LOCKDEP, static_obj() will cause error:
> > >
> > > [    0.067192] INFO: trying to register non-static key.
> > > [    0.067325] the code is fine but needs lockdep annotation.
> > > [    0.067449] turning off the locking correctness validator.
> > > [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
> > > [    0.067945] Call Trace:
> > > [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
> > > [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
> > > [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
> > > [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
> > > [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
> > > [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
> > > [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
> > > [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
> > > [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
> > > [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
> > > [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
> > > [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
> > >
> > > Because some __initdata static variables is before _stext:
> > >
> > > static int static_obj(const void *obj)
> > > {
> > >         unsigned long start = (unsigned long) &_stext,
> > >                       end   = (unsigned long) &_end,
> > >                       addr  = (unsigned long) obj;
> > >
> > >         /*
> > >          * static variable?
> > >          */
> > >         if ((addr >= start) && (addr < end))
> > >                 return 1;
> > >
> > >       if (arch_is_kernel_data(addr))
> > >               return 1;
> > >
> > > We could implement arch_is_kernel_data to fixup it.
> > >
> > > Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
> > > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > > Reported-by: Aurelien Jarno <aurelien@aurel32.net>
> > > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
> > > Cc: Atish Patra <atishp@atishpatra.org>
> > > Cc: Andreas Schwab <schwab@linux-m68k.org>
> > > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > > ---
> > >  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
> > >  arch/riscv/kernel/setup.c         |  9 +++++++++
> > >  2 files changed, 29 insertions(+)
> > >  create mode 100644 arch/riscv/include/asm/sections.h
> > >
> > > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> > > new file mode 100644
> > > index 00000000..2317b9e
> > > --- /dev/null
> > > +++ b/arch/riscv/include/asm/sections.h
> > > @@ -0,0 +1,20 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-only */
> > > +
> > > +#ifndef _ASM_RISCV_SECTIONS_H
> > > +#define _ASM_RISCV_SECTIONS_H
> > > +
> > > +#define arch_is_kernel_data arch_is_kernel_data
> > > +
> > > +#include <asm-generic/sections.h>
> > > +
> > > +extern bool init_mem_is_free;
> > > +
> > > +static inline int arch_is_kernel_data(unsigned long addr)
> > > +{
> > > +     if (init_mem_is_free)
> > > +             return 0;
> > > +
> > > +     return addr >= (unsigned long)__init_begin &&
> > > +             addr < (unsigned long)__init_end;
> > > +}
> > > +#endif /* _ASM_RISCV_SECTIONS_H */
> > > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > > index 2c6dd32..9ebd5eb4 100644
> > > --- a/arch/riscv/kernel/setup.c
> > > +++ b/arch/riscv/kernel/setup.c
> > > @@ -17,6 +17,7 @@
> > >  #include <linux/sched/task.h>
> > >  #include <linux/swiotlb.h>
> > >  #include <linux/smp.h>
> > > +#include <linux/poison.h>
> > >
> > >  #include <asm/cpu_ops.h>
> > >  #include <asm/setup.h>
> > > @@ -112,3 +113,11 @@ static int __init topology_init(void)
> > >       return 0;
> > >  }
> > >  subsys_initcall(topology_init);
> > > +
> > > +bool init_mem_is_free = false;
> > > +
> > > +void free_initmem(void)
> > > +{
> > > +     free_initmem_default(POISON_FREE_INITMEM);
> > > +     init_mem_is_free = true;
> > > +}
> >
> > I'm a bit confused as to what you're trying to do here.  Yesterday I got
> > another version of this patch set that moves init data around, today a
> > different one.  Yesterday's is tested and simpler, and given it's so late in
> > the process I'm inclined to take that as I don't want to break anything.
> >
> > Right now I have
> >
> > 84814460eef9 ("riscv: Fixup bootup failure with HARDENED_USERCOPY")
> > a78c6f5956a9 ("RISC-V: Make sure memblock reserves the memory containing DT")
> > 549738f15da0 ("Linux 5.9-rc8")
> >
> > Unless there's some functional bug, that's what I'm going to send out for 5.9
> > -- I'm not all that worried about lacking the ability to free init data.  The
> > above seems like fine 5.10 material.
> >
> > Let me know if I'm missing something here.
> 84814460eef9 could resolve the problem and Atish ask for any other
> idea? So It's another choice, I forgot RFC in prefix.
>

I prefer this fix as it is cleaner and doesn't waste memory. I have
sent another series
on top of this fix, that addresses the init section protections we
talked about. All of these are definitely
next merge window material.

> 6184358da0004c8fd940afda6c0a0fa4027dc911("riscv: Fixup static_obj()
> fail") is a sloppy patch that introduces another problem. Sorry about
> that.
>
> --
> Best Regards
>  Guo Ren
>
> ML: https://lore.kernel.org/linux-csky/



-- 
Regards,
Atish

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH 2/2] riscv: Fixup static_obj() fail v2
  2020-10-09 21:16       ` Atish Patra
@ 2020-10-09 21:23         ` Palmer Dabbelt
  0 siblings, 0 replies; 10+ messages in thread
From: Palmer Dabbelt @ 2020-10-09 21:23 UTC (permalink / raw)
  To: atishp; +Cc: guoren, linux-kernel, schwab, guoren, linux-riscv, aurelien

On Fri, 09 Oct 2020 14:16:00 PDT (-0700), atishp@atishpatra.org wrote:
> On Thu, Oct 8, 2020 at 6:53 PM Guo Ren <guoren@kernel.org> wrote:
>>
>> On Thu, Oct 8, 2020 at 11:54 AM Palmer Dabbelt <palmerdabbelt@google.com> wrote:
>> >
>> > On Wed, 07 Oct 2020 08:08:33 PDT (-0700), guoren@kernel.org wrote:
>> > > From: Guo Ren <guoren@linux.alibaba.com>
>> > >
>> > > v1 is commit: 6184358da0004c8fd940afda6c0a0fa4027dc911 which has
>> > > been reverted.
>> > >
>> > > When enable LOCKDEP, static_obj() will cause error:
>> > >
>> > > [    0.067192] INFO: trying to register non-static key.
>> > > [    0.067325] the code is fine but needs lockdep annotation.
>> > > [    0.067449] turning off the locking correctness validator.
>> > > [    0.067718] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc7-dirty #44
>> > > [    0.067945] Call Trace:
>> > > [    0.068369] [<ffffffe00020323c>] walk_stackframe+0x0/0xa4
>> > > [    0.068506] [<ffffffe000203422>] show_stack+0x2a/0x34
>> > > [    0.068631] [<ffffffe000521e4e>] dump_stack+0x94/0xca
>> > > [    0.068757] [<ffffffe000255a4e>] register_lock_class+0x5b8/0x5bc
>> > > [    0.068969] [<ffffffe000255abe>] __lock_acquire+0x6c/0x1d5c
>> > > [    0.069101] [<ffffffe0002550fe>] lock_acquire+0xae/0x312
>> > > [    0.069228] [<ffffffe000989a8e>] _raw_spin_lock_irqsave+0x40/0x5a
>> > > [    0.069357] [<ffffffe000247c64>] complete+0x1e/0x50
>> > > [    0.069479] [<ffffffe000984c38>] rest_init+0x1b0/0x28a
>> > > [    0.069660] [<ffffffe0000016a2>] 0xffffffe0000016a2
>> > > [    0.069779] [<ffffffe000001b84>] 0xffffffe000001b84
>> > > [    0.069953] [<ffffffe000001092>] 0xffffffe000001092
>> > >
>> > > Because some __initdata static variables is before _stext:
>> > >
>> > > static int static_obj(const void *obj)
>> > > {
>> > >         unsigned long start = (unsigned long) &_stext,
>> > >                       end   = (unsigned long) &_end,
>> > >                       addr  = (unsigned long) obj;
>> > >
>> > >         /*
>> > >          * static variable?
>> > >          */
>> > >         if ((addr >= start) && (addr < end))
>> > >                 return 1;
>> > >
>> > >       if (arch_is_kernel_data(addr))
>> > >               return 1;
>> > >
>> > > We could implement arch_is_kernel_data to fixup it.
>> > >
>> > > Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
>> > > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
>> > > Reported-by: Aurelien Jarno <aurelien@aurel32.net>
>> > > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
>> > > Cc: Atish Patra <atishp@atishpatra.org>
>> > > Cc: Andreas Schwab <schwab@linux-m68k.org>
>> > > Cc: Aurelien Jarno <aurelien@aurel32.net>
>> > > ---
>> > >  arch/riscv/include/asm/sections.h | 20 ++++++++++++++++++++
>> > >  arch/riscv/kernel/setup.c         |  9 +++++++++
>> > >  2 files changed, 29 insertions(+)
>> > >  create mode 100644 arch/riscv/include/asm/sections.h
>> > >
>> > > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
>> > > new file mode 100644
>> > > index 00000000..2317b9e
>> > > --- /dev/null
>> > > +++ b/arch/riscv/include/asm/sections.h
>> > > @@ -0,0 +1,20 @@
>> > > +/* SPDX-License-Identifier: GPL-2.0-only */
>> > > +
>> > > +#ifndef _ASM_RISCV_SECTIONS_H
>> > > +#define _ASM_RISCV_SECTIONS_H
>> > > +
>> > > +#define arch_is_kernel_data arch_is_kernel_data
>> > > +
>> > > +#include <asm-generic/sections.h>
>> > > +
>> > > +extern bool init_mem_is_free;
>> > > +
>> > > +static inline int arch_is_kernel_data(unsigned long addr)
>> > > +{
>> > > +     if (init_mem_is_free)
>> > > +             return 0;
>> > > +
>> > > +     return addr >= (unsigned long)__init_begin &&
>> > > +             addr < (unsigned long)__init_end;
>> > > +}
>> > > +#endif /* _ASM_RISCV_SECTIONS_H */
>> > > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
>> > > index 2c6dd32..9ebd5eb4 100644
>> > > --- a/arch/riscv/kernel/setup.c
>> > > +++ b/arch/riscv/kernel/setup.c
>> > > @@ -17,6 +17,7 @@
>> > >  #include <linux/sched/task.h>
>> > >  #include <linux/swiotlb.h>
>> > >  #include <linux/smp.h>
>> > > +#include <linux/poison.h>
>> > >
>> > >  #include <asm/cpu_ops.h>
>> > >  #include <asm/setup.h>
>> > > @@ -112,3 +113,11 @@ static int __init topology_init(void)
>> > >       return 0;
>> > >  }
>> > >  subsys_initcall(topology_init);
>> > > +
>> > > +bool init_mem_is_free = false;
>> > > +
>> > > +void free_initmem(void)
>> > > +{
>> > > +     free_initmem_default(POISON_FREE_INITMEM);
>> > > +     init_mem_is_free = true;
>> > > +}
>> >
>> > I'm a bit confused as to what you're trying to do here.  Yesterday I got
>> > another version of this patch set that moves init data around, today a
>> > different one.  Yesterday's is tested and simpler, and given it's so late in
>> > the process I'm inclined to take that as I don't want to break anything.
>> >
>> > Right now I have
>> >
>> > 84814460eef9 ("riscv: Fixup bootup failure with HARDENED_USERCOPY")
>> > a78c6f5956a9 ("RISC-V: Make sure memblock reserves the memory containing DT")
>> > 549738f15da0 ("Linux 5.9-rc8")
>> >
>> > Unless there's some functional bug, that's what I'm going to send out for 5.9
>> > -- I'm not all that worried about lacking the ability to free init data.  The
>> > above seems like fine 5.10 material.
>> >
>> > Let me know if I'm missing something here.
>> 84814460eef9 could resolve the problem and Atish ask for any other
>> idea? So It's another choice, I forgot RFC in prefix.
>>
>
> I prefer this fix as it is cleaner and doesn't waste memory. I have
> sent another series
> on top of this fix, that addresses the init section protections we
> talked about. All of these are definitely
> next merge window material.

Thanks, I'll take a look.

>
>> 6184358da0004c8fd940afda6c0a0fa4027dc911("riscv: Fixup static_obj()
>> fail") is a sloppy patch that introduces another problem. Sorry about
>> that.
>>
>> --
>> 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

^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, back to index

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-07 15:08 [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" guoren
2020-10-07 15:08 ` [PATCH 2/2] riscv: Fixup static_obj() fail v2 guoren
2020-10-07 19:46   ` Atish Patra
2020-10-08  2:30     ` Guo Ren
2020-10-08  3:54   ` Palmer Dabbelt
2020-10-08 17:57     ` Atish Patra
2020-10-09  1:53     ` Guo Ren
2020-10-09 21:16       ` Atish Patra
2020-10-09 21:23         ` Palmer Dabbelt
2020-10-07 18:52 ` [PATCH 1/2] Revert "riscv: Fixup static_obj() fail" Atish Patra

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