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| author | Michael Neuling <mikey@neuling.org> | 2018-09-14 04:14:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-13 10:27:28 +0300 |
| commit | 609fbeddb24c4035d24fc32d82dc08b30ae3dfc0 (patch) | |
| tree | 8fd8d59ba5c731ffcb9cc0508e4b28e6223aab30 /arch/powerpc/lib | |
| parent | 4e43fbc8ef2598cfea7704f6e496db70fe86e6d1 (diff) | |
| download | linux-609fbeddb24c4035d24fc32d82dc08b30ae3dfc0.tar.xz | |
powerpc: Avoid code patching freed init sections
commit 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3 upstream.
This stops us from doing code patching in init sections after they've
been freed.
In this chain:
kvm_guest_init() ->
kvm_use_magic_page() ->
fault_in_pages_readable() ->
__get_user() ->
__get_user_nocheck() ->
barrier_nospec();
We have a code patching location at barrier_nospec() and
kvm_guest_init() is an init function. This whole chain gets inlined,
so when we free the init section (hence kvm_guest_init()), this code
goes away and hence should no longer be patched.
We seen this as userspace memory corruption when using a memory
checker while doing partition migration testing on powervm (this
starts the code patching post migration via
/sys/kernel/mobility/migration). In theory, it could also happen when
using /sys/kernel/debug/powerpc/barrier_nospec.
Cc: stable@vger.kernel.org # 4.13+
Signed-off-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index e1c58937281f..0054b0be8985 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -22,12 +22,19 @@ #include <asm/page.h> #include <asm/code-patching.h> #include <asm/setup.h> +#include <asm/sections.h> static int __patch_instruction(unsigned int *exec_addr, unsigned int instr, unsigned int *patch_addr) { int err; + /* Make sure we aren't patching a freed init section */ + if (init_mem_is_free && init_section_contains(exec_addr, 4)) { + pr_debug("Skipping init section patching addr: 0x%px\n", exec_addr); + return 0; + } + __put_user_size(instr, patch_addr, 4, err); if (err) return err; |