linux-kernel - Re: [PATCH] riscv: Check that vdso does not contain any dynamic relocations

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Message-ID: <352f8101-01c3-45b9-9d53-ef0021cc6f46@syntacore.com>
Date: Thu, 28 Mar 2024 10:32:06 +0300
From: Vladimir Isaev <vladimir.isaev@...tacore.com>
To: Alexandre Ghiti <alexghiti@...osinc.com>, Roman Artemev
	<roman.artemev@...tacore.com>, Guo Ren <guoren@...nel.org>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou
	<aou@...s.berkeley.edu>, <linux-riscv@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: Check that vdso does not contain any dynamic
 relocations

Hi Alexandre,

26.03.2024 14:38, Alexandre Ghiti wrote:
> 
> Like other architectures, use the common cmd_vdso_check to make sure of
> that.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/kernel/vdso/Makefile | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index 9b517fe1b8a8..dd4877f25928 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -49,7 +49,7 @@ $(obj)/vdso.o: $(obj)/vdso.so
> 
>  # link rule for the .so file, .lds has to be first
>  $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
> -       $(call if_changed,vdsold)
> +       $(call if_changed,vdsold_and_check)
>  LDFLAGS_vdso.so.dbg = -shared -S -soname=linux-vdso.so.1 \
>         --build-id=sha1 --hash-style=both --eh-frame-hdr
> 
> @@ -69,7 +69,8 @@ include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
>  # actual build commands
>  # The DSO images are built using a special linker script
>  # Make sure only to export the intended __vdso_xxx symbol offsets.
> -quiet_cmd_vdsold = VDSOLD  $@
> -      cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@...p && \
> +quiet_cmd_vdsold_and_check = VDSOLD  $@
> +      cmd_vdsold_and_check = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@...p && \
>                     $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@...p $@ && \
> -                   rm $@...p
> +                   rm $@...p && \
> +                   $(cmd_vdso_check)

For some reason I thought that this check is in the common vdso code and just missed hwprobe relocation...

Tested-by: Vladimir Isaev <vladimir.isaev@...tacore.com>

> --
> 2.39.2
> 

Thank you,
Vladimir Isaev