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| author | Nathan Chancellor <nathan@kernel.org> | 2022-07-13 10:35:03 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-07-14 16:57:26 +0200 |
| commit | 33f32e5072b6cc84d1b130a3ad485849bcec907a (patch) | |
| tree | c2fbbeba0620fde9c734e3f7d479ab102ac506c3 /arch/arm64/net | |
| parent | 94bf6aad5dbed1c93618035ec31b37927538c276 (diff) | |
| download | lwn-33f32e5072b6cc84d1b130a3ad485849bcec907a.tar.gz lwn-33f32e5072b6cc84d1b130a3ad485849bcec907a.zip | |
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: b2ad54e1533e ("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
Diffstat (limited to 'arch/arm64/net')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index fd1cb0d2aaa6..dcc572b7d4da 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -604,6 +604,7 @@ void dummy_tramp(void); asm ( " .pushsection .text, \"ax\", @progbits\n" +" .global dummy_tramp\n" " .type dummy_tramp, %function\n" "dummy_tramp:" #if IS_ENABLED(CONFIG_ARM64_BTI_KERNEL) |