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mman: Add map_shadow_stack() flags

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In preparation for adding arm64 GCS support make the map_shadow_stack()
SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing
flag indicates that a token usable for stack switch should be added to
the top of the newly mapped GCS region while the new flag indicates that
a top of stack marker suitable for use by unwinders should be added
above that.

For arm64 the top of stack marker is all bits 0.

Reviewed-by: Thiago Jung Bauermann <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Acked-by: Yury Khrustalev <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Mark Brown authored and Catalin Marinas committed 2024-10-04 12:04:33 +01:00
1 parent 91e102e797
commit 3630e82ab6
2 files changed
+4 -3
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arch/x86/include/uapi/asm/mman.h
-3
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@@ -5,9 +5,6 @@
#define MAP_32BIT 0x40 /* only give out 32bit addresses */
#define MAP_ABOVE4G 0x80 /* only map above 4GB */
/* Flags for map_shadow_stack(2) */
#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */
#include <asm-generic/mman.h>
#endif /* _ASM_X86_MMAN_H */
include/uapi/asm-generic/mman.h
+4
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@@ -19,4 +19,8 @@
#define MCL_FUTURE 2 /* lock all future mappings */
#define MCL_ONFAULT 4 /* lock all pages that are faulted in */
#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */
#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack marker in the shadow stack */
#endif /* __ASM_GENERIC_MMAN_H */