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authorArvind Sankar <nivedita@alum.mit.edu>2020-01-09 10:02:18 -0500
committerBorislav Petkov <bp@suse.de>2020-02-24 12:30:28 +0100
commit0eea39a234dc52063d14541fabcb2c64516a2328 (patch)
tree3b251df239719d616380ac7748c11ec381aea5fa /arch/x86/boot/compressed
parent3ee372ccce4d4e7c610748d0583979d3ed3a0cf4 (diff)
downloadlinux-0eea39a234dc52063d14541fabcb2c64516a2328.tar.bz2
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 <nivedita@alum.mit.edu> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Link: https://lkml.kernel.org/r/20200109150218.16544-2-nivedita@alum.mit.edu
Diffstat (limited to 'arch/x86/boot/compressed')
-rw-r--r--arch/x86/boot/compressed/vmlinux.lds.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
index 508cfa6828c5..469dcf800a2c 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)
+ }
}