OrgACRN
/
acrn-kernel
mirror of https://github.com/projectacrn/acrn-kernel.git
1
0
Fork 0
Code Issues Releases Wiki Activity

bpf, arm64: Mark dummy_tramp as global 

When building with clang + CONFIG_CFI_CLANG=y, the following error
occurs at link time:

  ld.lld: error: undefined symbol: dummy_tramp

dummy_tramp is declared globally in C but its definition in inline
assembly does not use .global, which prevents clang from properly
resolving the references to it when creating the CFI jump tables.

Mark dummy_tramp as global so that the reference can be properly
resolved.

Fixes: b2ad54e153 ("bpf, arm64: Implement bpf_arch_text_poke() for arm64")
Suggested-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1661
Link: https://lore.kernel.org/bpf/20220713173503.3889486-1-nathan@kernel.org
This commit is contained in:
Nathan Chancellor 2022-07-13 10:35:03 -07:00 committed by Daniel Borkmann
parent 94bf6aad5d
commit 33f32e5072
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/net/bpf_jit_comp.c
View File

@ -604,6 +604,7 @@ void dummy_tramp(void);
asm ( asm (
" .pushsection .text, \"ax\", @progbits\n" " .pushsection .text, \"ax\", @progbits\n"
" .global dummy_tramp\n"
" .type dummy_tramp, %function\n" " .type dummy_tramp, %function\n"
"dummy_tramp:" "dummy_tramp:"
#if IS_ENABLED(CONFIG_ARM64_BTI_KERNEL) #if IS_ENABLED(CONFIG_ARM64_BTI_KERNEL)