Messages in this thread Patch in this message | | | From | "H.J. Lu" <> | Subject | [PATCH 1/2] x86: Discard .note.gnu.property sections in vDSO | Date | Fri, 24 Jan 2020 10:18:18 -0800 |
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With the command-line option, -mx86-used-note=yes, the x86 assembler in binutils 2.32 and above generates a program property note in a note section, .note.gnu.property, to encode used x86 ISAs and features. X86 kernel vDSO linker script only contains a signle NOTE segment:
PHDRS { text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ note PT_NOTE FLAGS(4); /* PF_R */ eh_frame_hdr 0x6474e550; }
which may not be incompatible with note.gnu.property sections. Since note.gnu.property section in vDSO is not used by dynamic linker, this patch discards .note.gnu.property sections in vDSO by adding
/DISCARD/ : { *(.note.gnu.property) }
before .notes sections.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> --- arch/x86/entry/vdso/vdso-layout.lds.S | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S index 93c6dc7812d0..b604da6cc024 100644 --- a/arch/x86/entry/vdso/vdso-layout.lds.S +++ b/arch/x86/entry/vdso/vdso-layout.lds.S @@ -52,6 +52,10 @@ SECTIONS *(.gnu.linkonce.b.*) } :text + /* .note.gnu.property sections should be discarded */ + /DISCARD/ : { + *(.note.gnu.property) + } .note : { *(.note.*) } :text :note .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr -- 2.24.1
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