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[PATCH v2 3/3] arm64/boot: Disallow BSS exports to startup code

Ard Biesheuvel posted 3 patches 7 months, 1 week ago
[PATCH v2 3/3] arm64/boot: Disallow BSS exports to startup code
Posted by Ard Biesheuvel 7 months, 1 week ago 
From: Ard Biesheuvel <ardb@kernel.org>

BSS might be uninitialized when entering the startup code, so forbid the
use by the startup code of any variables that live after __bss_start in
the linker map.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/kernel/image-vars.h  | 62 +++++++++++---------
 arch/arm64/kernel/vmlinux.lds.S |  2 +
 2 files changed, 35 insertions(+), 29 deletions(-)

diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index c3b4c0479d5c..a928e0c0b45a 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -10,6 +10,12 @@
 #error This file should only be included in vmlinux.lds.S
 #endif
 
+#define PI_EXPORT_SYM(sym)		\
+	__PI_EXPORT_SYM(sym, __pi_ ## sym, Cannot export BSS symbol sym to startup code)
+#define __PI_EXPORT_SYM(sym, pisym, msg)\
+	PROVIDE(pisym = sym);		\
+	ASSERT((sym - KIMAGE_VADDR) < (__bss_start - KIMAGE_VADDR), #msg)
+
 PROVIDE(__efistub_primary_entry		= primary_entry);
 
 /*
@@ -36,37 +42,35 @@ PROVIDE(__pi___memcpy			= __pi_memcpy);
 PROVIDE(__pi___memmove			= __pi_memmove);
 PROVIDE(__pi___memset			= __pi_memset);
 
-PROVIDE(__pi_id_aa64isar1_override	= id_aa64isar1_override);
-PROVIDE(__pi_id_aa64isar2_override	= id_aa64isar2_override);
-PROVIDE(__pi_id_aa64mmfr0_override	= id_aa64mmfr0_override);
-PROVIDE(__pi_id_aa64mmfr1_override	= id_aa64mmfr1_override);
-PROVIDE(__pi_id_aa64mmfr2_override	= id_aa64mmfr2_override);
-PROVIDE(__pi_id_aa64pfr0_override	= id_aa64pfr0_override);
-PROVIDE(__pi_id_aa64pfr1_override	= id_aa64pfr1_override);
-PROVIDE(__pi_id_aa64smfr0_override	= id_aa64smfr0_override);
-PROVIDE(__pi_id_aa64zfr0_override	= id_aa64zfr0_override);
-PROVIDE(__pi_arm64_sw_feature_override	= arm64_sw_feature_override);
-PROVIDE(__pi_arm64_use_ng_mappings	= arm64_use_ng_mappings);
+PI_EXPORT_SYM(id_aa64isar1_override);
+PI_EXPORT_SYM(id_aa64isar2_override);
+PI_EXPORT_SYM(id_aa64mmfr0_override);
+PI_EXPORT_SYM(id_aa64mmfr1_override);
+PI_EXPORT_SYM(id_aa64mmfr2_override);
+PI_EXPORT_SYM(id_aa64pfr0_override);
+PI_EXPORT_SYM(id_aa64pfr1_override);
+PI_EXPORT_SYM(id_aa64smfr0_override);
+PI_EXPORT_SYM(id_aa64zfr0_override);
+PI_EXPORT_SYM(arm64_sw_feature_override);
+PI_EXPORT_SYM(arm64_use_ng_mappings);
 #ifdef CONFIG_CAVIUM_ERRATUM_27456
-PROVIDE(__pi_cavium_erratum_27456_cpus	= cavium_erratum_27456_cpus);
-PROVIDE(__pi_is_midr_in_range_list	= is_midr_in_range_list);
+PI_EXPORT_SYM(cavium_erratum_27456_cpus);
+PI_EXPORT_SYM(is_midr_in_range_list);
 #endif
-PROVIDE(__pi__ctype			= _ctype);
-PROVIDE(__pi_memstart_offset_seed	= memstart_offset_seed);
-
-PROVIDE(__pi_swapper_pg_dir		= swapper_pg_dir);
-
-PROVIDE(__pi__text			= _text);
-PROVIDE(__pi__stext               	= _stext);
-PROVIDE(__pi__etext               	= _etext);
-PROVIDE(__pi___start_rodata       	= __start_rodata);
-PROVIDE(__pi___inittext_begin     	= __inittext_begin);
-PROVIDE(__pi___inittext_end       	= __inittext_end);
-PROVIDE(__pi___initdata_begin     	= __initdata_begin);
-PROVIDE(__pi___initdata_end       	= __initdata_end);
-PROVIDE(__pi__data                	= _data);
-PROVIDE(__pi___bss_start		= __bss_start);
-PROVIDE(__pi__end			= _end);
+PI_EXPORT_SYM(_ctype);
+PI_EXPORT_SYM(memstart_offset_seed);
+
+PI_EXPORT_SYM(swapper_pg_dir);
+
+PI_EXPORT_SYM(_text);
+PI_EXPORT_SYM(_stext);
+PI_EXPORT_SYM(_etext);
+PI_EXPORT_SYM(__start_rodata);
+PI_EXPORT_SYM(__inittext_begin);
+PI_EXPORT_SYM(__inittext_end);
+PI_EXPORT_SYM(__initdata_begin);
+PI_EXPORT_SYM(__initdata_end);
+PI_EXPORT_SYM(_data);
 
 #ifdef CONFIG_KVM
 
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 466544c47dca..e4a525a865c1 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -319,6 +319,7 @@ SECTIONS
 
 	/* start of zero-init region */
 	BSS_SECTION(SBSS_ALIGN, 0, 0)
+	__pi___bss_start = __bss_start;
 
 	. = ALIGN(PAGE_SIZE);
 	__pi_init_pg_dir = .;
@@ -332,6 +333,7 @@ SECTIONS
 	. = ALIGN(SEGMENT_ALIGN);
 	__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
 	_end = .;
+	__pi__end = .;
 
 	STABS_DEBUG
 	DWARF_DEBUG
-- 
2.49.0.987.g0cc8ee98dc-goog
Re: [PATCH v2 3/3] arm64/boot: Disallow BSS exports to startup code
Posted by Yeoreum Yun 7 months, 1 week ago 
Hi Ard,

> From: Ard Biesheuvel <ardb@kernel.org>
>
> BSS might be uninitialized when entering the startup code, so forbid the
> use by the startup code of any variables that live after __bss_start in
> the linker map.
>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  arch/arm64/kernel/image-vars.h  | 62 +++++++++++---------
>  arch/arm64/kernel/vmlinux.lds.S |  2 +
>  2 files changed, 35 insertions(+), 29 deletions(-)
>
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index c3b4c0479d5c..a928e0c0b45a 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -10,6 +10,12 @@
>  #error This file should only be included in vmlinux.lds.S
>  #endif
>
> +#define PI_EXPORT_SYM(sym)		\
> +	__PI_EXPORT_SYM(sym, __pi_ ## sym, Cannot export BSS symbol sym to startup code)
> +#define __PI_EXPORT_SYM(sym, pisym, msg)\
> +	PROVIDE(pisym = sym);		\
> +	ASSERT((sym - KIMAGE_VADDR) < (__bss_start - KIMAGE_VADDR), #msg)
> +
>  PROVIDE(__efistub_primary_entry		= primary_entry);
>
>  /*
> @@ -36,37 +42,35 @@ PROVIDE(__pi___memcpy			= __pi_memcpy);
>  PROVIDE(__pi___memmove			= __pi_memmove);
>  PROVIDE(__pi___memset			= __pi_memset);
>
> -PROVIDE(__pi_id_aa64isar1_override	= id_aa64isar1_override);
> -PROVIDE(__pi_id_aa64isar2_override	= id_aa64isar2_override);
> -PROVIDE(__pi_id_aa64mmfr0_override	= id_aa64mmfr0_override);
> -PROVIDE(__pi_id_aa64mmfr1_override	= id_aa64mmfr1_override);
> -PROVIDE(__pi_id_aa64mmfr2_override	= id_aa64mmfr2_override);
> -PROVIDE(__pi_id_aa64pfr0_override	= id_aa64pfr0_override);
> -PROVIDE(__pi_id_aa64pfr1_override	= id_aa64pfr1_override);
> -PROVIDE(__pi_id_aa64smfr0_override	= id_aa64smfr0_override);
> -PROVIDE(__pi_id_aa64zfr0_override	= id_aa64zfr0_override);
> -PROVIDE(__pi_arm64_sw_feature_override	= arm64_sw_feature_override);
> -PROVIDE(__pi_arm64_use_ng_mappings	= arm64_use_ng_mappings);
> +PI_EXPORT_SYM(id_aa64isar1_override);
> +PI_EXPORT_SYM(id_aa64isar2_override);
> +PI_EXPORT_SYM(id_aa64mmfr0_override);
> +PI_EXPORT_SYM(id_aa64mmfr1_override);
> +PI_EXPORT_SYM(id_aa64mmfr2_override);
> +PI_EXPORT_SYM(id_aa64pfr0_override);
> +PI_EXPORT_SYM(id_aa64pfr1_override);
> +PI_EXPORT_SYM(id_aa64smfr0_override);
> +PI_EXPORT_SYM(id_aa64zfr0_override);
> +PI_EXPORT_SYM(arm64_sw_feature_override);
> +PI_EXPORT_SYM(arm64_use_ng_mappings);
>  #ifdef CONFIG_CAVIUM_ERRATUM_27456
> -PROVIDE(__pi_cavium_erratum_27456_cpus	= cavium_erratum_27456_cpus);
> -PROVIDE(__pi_is_midr_in_range_list	= is_midr_in_range_list);
> +PI_EXPORT_SYM(cavium_erratum_27456_cpus);
> +PI_EXPORT_SYM(is_midr_in_range_list);

small nit:
Would you rebase this patchset after
commit 117c3b21d3c7 ("arm64: Rework checks for broken Cavium HW in the PI code")?
Otherwise, I experience boot failure because of SCS related code:

  ffff80008009fbc0 <is_midr_in_range_list>:
  ffff80008009fbc0: d503245f   	bti	c
  ffff80008009fbc4: d503201f   	nop
  ffff80008009fbc8: d503201f   	nop
  ffff80008009fbcc: f800865e   	str	x30, [x18], #0x8 ---- (1)
  ffff80008009fbd0: d503233f   	paciasp
  ...

At pi phase, platform register initialized properly...
So it makes panic on (1).

Thanks!


>  #endif
> -PROVIDE(__pi__ctype			= _ctype);
> -PROVIDE(__pi_memstart_offset_seed	= memstart_offset_seed);
> -
> -PROVIDE(__pi_swapper_pg_dir		= swapper_pg_dir);
> -
> -PROVIDE(__pi__text			= _text);
> -PROVIDE(__pi__stext               	= _stext);
> -PROVIDE(__pi__etext               	= _etext);
> -PROVIDE(__pi___start_rodata       	= __start_rodata);
> -PROVIDE(__pi___inittext_begin     	= __inittext_begin);
> -PROVIDE(__pi___inittext_end       	= __inittext_end);
> -PROVIDE(__pi___initdata_begin     	= __initdata_begin);
> -PROVIDE(__pi___initdata_end       	= __initdata_end);
> -PROVIDE(__pi__data                	= _data);
> -PROVIDE(__pi___bss_start		= __bss_start);
> -PROVIDE(__pi__end			= _end);
> +PI_EXPORT_SYM(_ctype);
> +PI_EXPORT_SYM(memstart_offset_seed);
> +
> +PI_EXPORT_SYM(swapper_pg_dir);
> +
> +PI_EXPORT_SYM(_text);
> +PI_EXPORT_SYM(_stext);
> +PI_EXPORT_SYM(_etext);
> +PI_EXPORT_SYM(__start_rodata);
> +PI_EXPORT_SYM(__inittext_begin);
> +PI_EXPORT_SYM(__inittext_end);
> +PI_EXPORT_SYM(__initdata_begin);
> +PI_EXPORT_SYM(__initdata_end);
> +PI_EXPORT_SYM(_data);
>
>  #ifdef CONFIG_KVM
>
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> index 466544c47dca..e4a525a865c1 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -319,6 +319,7 @@ SECTIONS
>
>  	/* start of zero-init region */
>  	BSS_SECTION(SBSS_ALIGN, 0, 0)
> +	__pi___bss_start = __bss_start;
>
>  	. = ALIGN(PAGE_SIZE);
>  	__pi_init_pg_dir = .;
> @@ -332,6 +333,7 @@ SECTIONS
>  	. = ALIGN(SEGMENT_ALIGN);
>  	__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
>  	_end = .;
> +	__pi__end = .;
>
>  	STABS_DEBUG
>  	DWARF_DEBUG
> --
> 2.49.0.987.g0cc8ee98dc-goog
>

--
Sincerely,
Yeoreum Yun
Re: [PATCH v2 3/3] arm64/boot: Disallow BSS exports to startup code
Posted by Ard Biesheuvel 7 months, 1 week ago 
On Thu, 8 May 2025 at 15:34, Yeoreum Yun <yeoreum.yun@arm.com> wrote:
>
> Hi Ard,
>
> > From: Ard Biesheuvel <ardb@kernel.org>
> >
> > BSS might be uninitialized when entering the startup code, so forbid the
> > use by the startup code of any variables that live after __bss_start in
> > the linker map.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> > ---
> >  arch/arm64/kernel/image-vars.h  | 62 +++++++++++---------
> >  arch/arm64/kernel/vmlinux.lds.S |  2 +
> >  2 files changed, 35 insertions(+), 29 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> > index c3b4c0479d5c..a928e0c0b45a 100644
> > --- a/arch/arm64/kernel/image-vars.h
> > +++ b/arch/arm64/kernel/image-vars.h
> > @@ -10,6 +10,12 @@
> >  #error This file should only be included in vmlinux.lds.S
> >  #endif
> >
> > +#define PI_EXPORT_SYM(sym)           \
> > +     __PI_EXPORT_SYM(sym, __pi_ ## sym, Cannot export BSS symbol sym to startup code)
> > +#define __PI_EXPORT_SYM(sym, pisym, msg)\
> > +     PROVIDE(pisym = sym);           \
> > +     ASSERT((sym - KIMAGE_VADDR) < (__bss_start - KIMAGE_VADDR), #msg)
> > +
> >  PROVIDE(__efistub_primary_entry              = primary_entry);
> >
> >  /*
> > @@ -36,37 +42,35 @@ PROVIDE(__pi___memcpy                     = __pi_memcpy);
> >  PROVIDE(__pi___memmove                       = __pi_memmove);
> >  PROVIDE(__pi___memset                        = __pi_memset);
> >
> > -PROVIDE(__pi_id_aa64isar1_override   = id_aa64isar1_override);
> > -PROVIDE(__pi_id_aa64isar2_override   = id_aa64isar2_override);
> > -PROVIDE(__pi_id_aa64mmfr0_override   = id_aa64mmfr0_override);
> > -PROVIDE(__pi_id_aa64mmfr1_override   = id_aa64mmfr1_override);
> > -PROVIDE(__pi_id_aa64mmfr2_override   = id_aa64mmfr2_override);
> > -PROVIDE(__pi_id_aa64pfr0_override    = id_aa64pfr0_override);
> > -PROVIDE(__pi_id_aa64pfr1_override    = id_aa64pfr1_override);
> > -PROVIDE(__pi_id_aa64smfr0_override   = id_aa64smfr0_override);
> > -PROVIDE(__pi_id_aa64zfr0_override    = id_aa64zfr0_override);
> > -PROVIDE(__pi_arm64_sw_feature_override       = arm64_sw_feature_override);
> > -PROVIDE(__pi_arm64_use_ng_mappings   = arm64_use_ng_mappings);
> > +PI_EXPORT_SYM(id_aa64isar1_override);
> > +PI_EXPORT_SYM(id_aa64isar2_override);
> > +PI_EXPORT_SYM(id_aa64mmfr0_override);
> > +PI_EXPORT_SYM(id_aa64mmfr1_override);
> > +PI_EXPORT_SYM(id_aa64mmfr2_override);
> > +PI_EXPORT_SYM(id_aa64pfr0_override);
> > +PI_EXPORT_SYM(id_aa64pfr1_override);
> > +PI_EXPORT_SYM(id_aa64smfr0_override);
> > +PI_EXPORT_SYM(id_aa64zfr0_override);
> > +PI_EXPORT_SYM(arm64_sw_feature_override);
> > +PI_EXPORT_SYM(arm64_use_ng_mappings);
> >  #ifdef CONFIG_CAVIUM_ERRATUM_27456
> > -PROVIDE(__pi_cavium_erratum_27456_cpus       = cavium_erratum_27456_cpus);
> > -PROVIDE(__pi_is_midr_in_range_list   = is_midr_in_range_list);
> > +PI_EXPORT_SYM(cavium_erratum_27456_cpus);
> > +PI_EXPORT_SYM(is_midr_in_range_list);
>
> small nit:
> Would you rebase this patchset after
> commit 117c3b21d3c7 ("arm64: Rework checks for broken Cavium HW in the PI code")?
> Otherwise, I experience boot failure because of SCS related code:
>
>   ffff80008009fbc0 <is_midr_in_range_list>:
>   ffff80008009fbc0: d503245f    bti     c
>   ffff80008009fbc4: d503201f    nop
>   ffff80008009fbc8: d503201f    nop
>   ffff80008009fbcc: f800865e    str     x30, [x18], #0x8 ---- (1)
>   ffff80008009fbd0: d503233f    paciasp
>   ...
>
> At pi phase, platform register initialized properly...
> So it makes panic on (1).
>

That commit is not in the arm64 tree, so it will be up to Marc and
Catalin to resolve the conflict.

Your commit

363cd2b81cfd arm64: cpufeature: Move arm64_use_ng_mappings to the
.data section to prevent wrong idmap generation

is not in the kvmarm tree, so the build will not even complete if you
rebase it on that.

For testing, please merge the kvmarm tree and resolve the conflict by hand.
Re: [PATCH v2 3/3] arm64/boot: Disallow BSS exports to startup code
Posted by Yeoreum Yun 7 months, 1 week ago 
On Thu, May 08, 2025 at 02:34:12PM +0100, Yeoreum Yun wrote:
> Hi Ard,
>
> > From: Ard Biesheuvel <ardb@kernel.org>
> >
> > BSS might be uninitialized when entering the startup code, so forbid the
> > use by the startup code of any variables that live after __bss_start in
> > the linker map.
> >
> > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> > ---
> >  arch/arm64/kernel/image-vars.h  | 62 +++++++++++---------
> >  arch/arm64/kernel/vmlinux.lds.S |  2 +
> >  2 files changed, 35 insertions(+), 29 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> > index c3b4c0479d5c..a928e0c0b45a 100644
> > --- a/arch/arm64/kernel/image-vars.h
> > +++ b/arch/arm64/kernel/image-vars.h
> > @@ -10,6 +10,12 @@
> >  #error This file should only be included in vmlinux.lds.S
> >  #endif
> >
> > +#define PI_EXPORT_SYM(sym)		\
> > +	__PI_EXPORT_SYM(sym, __pi_ ## sym, Cannot export BSS symbol sym to startup code)
> > +#define __PI_EXPORT_SYM(sym, pisym, msg)\
> > +	PROVIDE(pisym = sym);		\
> > +	ASSERT((sym - KIMAGE_VADDR) < (__bss_start - KIMAGE_VADDR), #msg)
> > +
> >  PROVIDE(__efistub_primary_entry		= primary_entry);
> >
> >  /*
> > @@ -36,37 +42,35 @@ PROVIDE(__pi___memcpy			= __pi_memcpy);
> >  PROVIDE(__pi___memmove			= __pi_memmove);
> >  PROVIDE(__pi___memset			= __pi_memset);
> >
> > -PROVIDE(__pi_id_aa64isar1_override	= id_aa64isar1_override);
> > -PROVIDE(__pi_id_aa64isar2_override	= id_aa64isar2_override);
> > -PROVIDE(__pi_id_aa64mmfr0_override	= id_aa64mmfr0_override);
> > -PROVIDE(__pi_id_aa64mmfr1_override	= id_aa64mmfr1_override);
> > -PROVIDE(__pi_id_aa64mmfr2_override	= id_aa64mmfr2_override);
> > -PROVIDE(__pi_id_aa64pfr0_override	= id_aa64pfr0_override);
> > -PROVIDE(__pi_id_aa64pfr1_override	= id_aa64pfr1_override);
> > -PROVIDE(__pi_id_aa64smfr0_override	= id_aa64smfr0_override);
> > -PROVIDE(__pi_id_aa64zfr0_override	= id_aa64zfr0_override);
> > -PROVIDE(__pi_arm64_sw_feature_override	= arm64_sw_feature_override);
> > -PROVIDE(__pi_arm64_use_ng_mappings	= arm64_use_ng_mappings);
> > +PI_EXPORT_SYM(id_aa64isar1_override);
> > +PI_EXPORT_SYM(id_aa64isar2_override);
> > +PI_EXPORT_SYM(id_aa64mmfr0_override);
> > +PI_EXPORT_SYM(id_aa64mmfr1_override);
> > +PI_EXPORT_SYM(id_aa64mmfr2_override);
> > +PI_EXPORT_SYM(id_aa64pfr0_override);
> > +PI_EXPORT_SYM(id_aa64pfr1_override);
> > +PI_EXPORT_SYM(id_aa64smfr0_override);
> > +PI_EXPORT_SYM(id_aa64zfr0_override);
> > +PI_EXPORT_SYM(arm64_sw_feature_override);
> > +PI_EXPORT_SYM(arm64_use_ng_mappings);
> >  #ifdef CONFIG_CAVIUM_ERRATUM_27456
> > -PROVIDE(__pi_cavium_erratum_27456_cpus	= cavium_erratum_27456_cpus);
> > -PROVIDE(__pi_is_midr_in_range_list	= is_midr_in_range_list);
> > +PI_EXPORT_SYM(cavium_erratum_27456_cpus);
> > +PI_EXPORT_SYM(is_midr_in_range_list);
>
> small nit:
> Would you rebase this patchset after
> commit 117c3b21d3c7 ("arm64: Rework checks for broken Cavium HW in the PI code")?
> Otherwise, I experience boot failure because of SCS related code:
>
>   ffff80008009fbc0 <is_midr_in_range_list>:
>   ffff80008009fbc0: d503245f   	bti	c
>   ffff80008009fbc4: d503201f   	nop
>   ffff80008009fbc8: d503201f   	nop
>   ffff80008009fbcc: f800865e   	str	x30, [x18], #0x8 ---- (1)
>   ffff80008009fbd0: d503233f   	paciasp
>   ...
>
> At pi phase, platform register initialized properly...
> So it makes panic on (1).

Doesn't initialize properly...
Sorry for typo.


>
> Thanks!
>
>
> >  #endif
> > -PROVIDE(__pi__ctype			= _ctype);
> > -PROVIDE(__pi_memstart_offset_seed	= memstart_offset_seed);
> > -
> > -PROVIDE(__pi_swapper_pg_dir		= swapper_pg_dir);
> > -
> > -PROVIDE(__pi__text			= _text);
> > -PROVIDE(__pi__stext               	= _stext);
> > -PROVIDE(__pi__etext               	= _etext);
> > -PROVIDE(__pi___start_rodata       	= __start_rodata);
> > -PROVIDE(__pi___inittext_begin     	= __inittext_begin);
> > -PROVIDE(__pi___inittext_end       	= __inittext_end);
> > -PROVIDE(__pi___initdata_begin     	= __initdata_begin);
> > -PROVIDE(__pi___initdata_end       	= __initdata_end);
> > -PROVIDE(__pi__data                	= _data);
> > -PROVIDE(__pi___bss_start		= __bss_start);
> > -PROVIDE(__pi__end			= _end);
> > +PI_EXPORT_SYM(_ctype);
> > +PI_EXPORT_SYM(memstart_offset_seed);
> > +
> > +PI_EXPORT_SYM(swapper_pg_dir);
> > +
> > +PI_EXPORT_SYM(_text);
> > +PI_EXPORT_SYM(_stext);
> > +PI_EXPORT_SYM(_etext);
> > +PI_EXPORT_SYM(__start_rodata);
> > +PI_EXPORT_SYM(__inittext_begin);
> > +PI_EXPORT_SYM(__inittext_end);
> > +PI_EXPORT_SYM(__initdata_begin);
> > +PI_EXPORT_SYM(__initdata_end);
> > +PI_EXPORT_SYM(_data);
> >
> >  #ifdef CONFIG_KVM
> >
> > diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> > index 466544c47dca..e4a525a865c1 100644
> > --- a/arch/arm64/kernel/vmlinux.lds.S
> > +++ b/arch/arm64/kernel/vmlinux.lds.S
> > @@ -319,6 +319,7 @@ SECTIONS
> >
> >  	/* start of zero-init region */
> >  	BSS_SECTION(SBSS_ALIGN, 0, 0)
> > +	__pi___bss_start = __bss_start;
> >
> >  	. = ALIGN(PAGE_SIZE);
> >  	__pi_init_pg_dir = .;
> > @@ -332,6 +333,7 @@ SECTIONS
> >  	. = ALIGN(SEGMENT_ALIGN);
> >  	__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
> >  	_end = .;
> > +	__pi__end = .;
> >
> >  	STABS_DEBUG
> >  	DWARF_DEBUG
> > --
> > 2.49.0.987.g0cc8ee98dc-goog
> >
>
> --
> Sincerely,
> Yeoreum Yun
>

--
Sincerely,
Yeoreum Yun

Patchew 2.1-devel-b67e4c2

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