| Message ID | 20230626122946.lspu73k24cinwobd@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] scripts/mksysmap: Ignore prefixed KCFI symbols | expand |
diff --git a/scripts/mksysmap b/scripts/mksysmap index 26f39772f7a5..9ba1c9da0a40 100755 --- a/scripts/mksysmap +++ b/scripts/mksysmap @@ -62,6 +62,8 @@ ${NM} -n ${1} | sed >${2} -e " # CFI type identifiers / __kcfi_typeid_/d +/ __kvm_nvhe___kcfi_typeid_/d +/ __pi___kcfi_typeid_/d # CRC from modversions / __crc_/d
The (relatively) new KCFI feature in LLVM/Clang encodes type information for C functions by generating symbols named __kcfi_typeid_<fname>, which can then be referenced from assembly. However, some custom build rules (e.g. nVHE or early PIE on arm64) use objcopy to add a prefix to all the symbols in their object files, making mksysmap's ignore filter miss those KCFI symbols. Therefore, explicitly list those twice-prefixed KCFI symbols as ignored. Alternatively, this could also be achieved in a less verbose way by ignoring any symbol containing the string "__kcfi_typeid_". However, listing the combined prefixes explicitly saves us from running the small risk of ignoring symbols that should be kept. Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> --- Changes in v2: Removed redundant filter for EFI KCFI symbol names. scripts/mksysmap | 2 ++ 1 file changed, 2 insertions(+)