This effectively unexports set_memory_ro and set_memory_rw functions from
commit 11d91a770f1f ("arm64: Add CONFIG_DEBUG_SET_MODULE_RONX support").No module user of those is in mainline kernel and we explicitly do not want modules to use these functions, as they i.e. protect eBPF (interpreted and JIT'ed) images from malicious modifications or bugs. Outside of eBPF scope, I believe also other set_memory_* functions should be unexported on arm64 for modules. Signed-off-by: Daniel Borkmann <[email protected]> Cc: Laura Abbott <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Acked-by: Alexei Starovoitov <[email protected]> --- arch/arm64/mm/pageattr.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index bb0ea94..8659357 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -70,7 +70,6 @@ int set_memory_ro(unsigned long addr, int numpages) __pgprot(PTE_RDONLY), __pgprot(PTE_WRITE)); } -EXPORT_SYMBOL_GPL(set_memory_ro); int set_memory_rw(unsigned long addr, int numpages) { @@ -78,7 +77,6 @@ int set_memory_rw(unsigned long addr, int numpages) __pgprot(PTE_WRITE), __pgprot(PTE_RDONLY)); } -EXPORT_SYMBOL_GPL(set_memory_rw); int set_memory_nx(unsigned long addr, int numpages) { -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
