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scs: add CONFIG_MMU dependency for vfree_atomic()

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commit 6f9dc684cae638dda0570154509884ee78d0f75c upstream.

The shadow call stack implementation fails to build without CONFIG_MMU:

  ld.lld: error: undefined symbol: vfree_atomic
  >>> referenced by scs.c
  >>>               kernel/scs.o:(scs_free) in archive vmlinux.a

Link: https://lkml.kernel.org/r/20240122175204.2371009-1-samuel.holland@sifive.com
Fixes: a2abe7cbd8fe ("scs: switch to vmapped shadow stacks")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Holland 2024-01-22 09:52:01 -08:00 committed by Greg Kroah-Hartman
parent 29b3681010
commit cd459beede
1 changed files with 1 additions and 0 deletions
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arch/Kconfig
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@ -605,6 +605,7 @@ config SHADOW_CALL_STACK
bool "Clang Shadow Call Stack"
depends on CC_IS_CLANG && ARCH_SUPPORTS_SHADOW_CALL_STACK
depends on DYNAMIC_FTRACE_WITH_REGS || !FUNCTION_GRAPH_TRACER
depends on MMU
help
This option enables Clang's Shadow Call Stack, which uses a
shadow stack to protect function return addresses from being