From: Arvind Sankar Date: Thu, 9 Jan 2020 15:02:18 +0000 (-0500) Subject: x86/boot/compressed: Remove .eh_frame section from bzImage X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0eea39a234dc52063d14541fabcb2c64516a2328;p=linux.git x86/boot/compressed: Remove .eh_frame section from bzImage Discarding unnecessary sections with "*(*)" (see thread at Link: below) works fine with the bfd linker but fails with lld: $ make -j$(nproc) -s CC=clang LD=ld.lld O=out.x86_64 distclean defconfig bzImage ld.lld: error: discarding .shstrtab section is not allowed lld tries to also discard essential sections like .shstrtab, .symtab and .strtab, which results in the link failing since .shstrtab is required by the ELF specification: the e_shstrndx field in the ELF header is the index of .shstrtab, and each section in the section table is required to have an sh_name that points into the .shstrtab. .symtab and .strtab are also necessary to generate the zoffset.h file for the bzImage header. Since the only sizeable section that can be discarded is .eh_frame, restrict the discard to only .eh_frame to be safe. [ bp: Flesh out commit message and replace offending commit with this one. ] Signed-off-by: Arvind Sankar Signed-off-by: Borislav Petkov Tested-by: Nathan Chancellor Link: https://lkml.kernel.org/r/20200109150218.16544-2-nivedita@alum.mit.edu --- diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 508cfa6828c5d..469dcf800a2c1 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -73,4 +73,9 @@ SECTIONS #endif . = ALIGN(PAGE_SIZE); /* keep ZO size page aligned */ _end = .; + + /* Discard .eh_frame to save some space */ + /DISCARD/ : { + *(.eh_frame) + } }