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authorConnor O'Brien <connoro@google.com>2022-02-23 01:28:14 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2022-02-28 14:17:10 +0100
commit5e214f2e43e453d862ebbbd2a4f7ee3fe650f209 (patch)
tree457e120feecafe35cc3475dcd897f4f25dea12f1 /lib
parentdda7596c109fc382876118627e29db7607cde35d (diff)
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bpf: Add config to allow loading modules with BTF mismatches
BTF mismatch can occur for a separately-built module even when the ABI is otherwise compatible and nothing else would prevent successfully loading. Add a new Kconfig to control how mismatches are handled. By default, preserve the current behavior of refusing to load the module. If MODULE_ALLOW_BTF_MISMATCH is enabled, load the module but ignore its BTF information. Suggested-by: Yonghong Song <yhs@fb.com> Suggested-by: Michal Suchánek <msuchanek@suse.de> Signed-off-by: Connor O'Brien <connoro@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/CAADnVQJ+OVPnBz8z3vNu8gKXX42jCUqfuvhWAyCQDu8N_yqqwQ@mail.gmail.com Link: https://lore.kernel.org/bpf/20220223012814.1898677-1-connoro@google.com
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1555da672275..72ca4684beda 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -339,6 +339,16 @@ config DEBUG_INFO_BTF_MODULES
help
Generate compact split BTF type information for kernel modules.
+config MODULE_ALLOW_BTF_MISMATCH
+ bool "Allow loading modules with non-matching BTF type info"
+ depends on DEBUG_INFO_BTF_MODULES
+ help
+ For modules whose split BTF does not match vmlinux, load without
+ BTF rather than refusing to load. The default behavior with
+ module BTF enabled is to reject modules with such mismatches;
+ this option will still load module BTF where possible but ignore
+ it when a mismatch is found.
+
config GDB_SCRIPTS
bool "Provide GDB scripts for kernel debugging"
help