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| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-03-01 13:14:39 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-03-19 13:43:56 +0300 |
| commit | e6a2e1b6c24a3993ffbb69a05dda202d2830ad90 (patch) | |
| tree | e966e4a334395baec1fa3b9e98c4a5f8e6925803 | |
| parent | a8fcd8b192bb15debe1db276e073c6ba9a3fc953 (diff) | |
| download | linux-e6a2e1b6c24a3993ffbb69a05dda202d2830ad90.tar.xz | |
arm64: mm: unexport set_memory_ro and set_memory_rw
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. RO-protect eBPF (interpreted and
JIT'ed) images from malicious modifications/bugs.
Outside of eBPF scope, I believe also other set_memory_* functions should
be unexported on arm64 due to non-existant mainline module user. Laura
mentioned that they have some uses for modules doing set_memory_*, but
none that are in mainline and it's unclear if they would ever get there.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/mm/pageattr.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 1d3ec3ddd84b..e47ed1c5dce1 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -73,7 +73,6 @@ 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) { @@ -81,7 +80,6 @@ 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) { |