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kernel: add MODULE_ALLOW_BTF_MISMATCH option

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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 config 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.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
This commit is contained in:
Tianling Shen 2023-05-16 12:38:53 +08:00 committed by Christian Lamparter
parent 8217f02a1c
commit c07038da27
1 changed files with 10 additions and 0 deletions
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10
config/Config-kernel.in
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@ -373,6 +373,16 @@ config KERNEL_DEBUG_INFO_BTF
Required to run BPF CO-RE applications.
config KERNEL_MODULE_ALLOW_BTF_MISMATCH
bool "Allow loading modules with non-matching BTF type info"
depends on KERNEL_DEBUG_INFO_BTF
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 KERNEL_DEBUG_INFO_REDUCED
bool "Reduce debugging information"
default y