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gcs: add GCS constants and helper macros

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Introduce ARM64 Guarded Control Stack (GCS) constants and macros
in a new uapi header for use in both CRIU and compel.

Includes:
 - NT_ARM_GCS type
 - prctl(2) constants for GCS enable/write/push modes
 - Capability token helpers (GCS_CAP, GCS_SIGNAL_CAP)
 - HWCAP_GCS definition

These are based on upstream Linux definitions

Signed-off-by: Igor Svilenkov Bozic <svilenkov@gmail.com>
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Acked-by: Mike Rapoport <rppt@kernel.org>
This commit is contained in:
Igor Svilenkov Bozic 2025-08-13 17:48:56 +02:00 • committed by Alexander Mikhalitsyn
parent 09ade038b3
commit 7be1dbd4b5
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1 changed files with 47 additions and 0 deletions
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47
compel/arch/aarch64/src/lib/include/uapi/asm/gcs-types.h Normal file
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#ifndef __UAPI_ASM_GCS_TYPES_H__
#define __UAPI_ASM_GCS_TYPES_H__
#ifndef NT_ARM_GCS
#define NT_ARM_GCS 0x410 /* ARM GCS state */
#endif
/* Shadow Stack/Guarded Control Stack interface */
#define PR_GET_SHADOW_STACK_STATUS 74
#define PR_SET_SHADOW_STACK_STATUS 75
#define PR_LOCK_SHADOW_STACK_STATUS 76
/* When set PR_SHADOW_STACK_ENABLE flag allocates a Guarded Control Stack */
#ifndef PR_SHADOW_STACK_ENABLE
#define PR_SHADOW_STACK_ENABLE (1UL << 0)
#endif
/* Allows explicit GCS stores (eg. using GCSSTR) */
#ifndef PR_SHADOW_STACK_WRITE
#define PR_SHADOW_STACK_WRITE (1UL << 1)
#endif
/* Allows explicit GCS pushes (eg. using GCSPUSHM) */
#ifndef PR_SHADOW_STACK_PUSH
#define PR_SHADOW_STACK_PUSH (1UL << 2)
#endif
#ifndef SHADOW_STACK_SET_TOKEN
#define SHADOW_STACK_SET_TOKEN 0x1 /* Set up a restore token in the shadow stack */
#endif
#define PR_SHADOW_STACK_ALL_MODES \
PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_WRITE | PR_SHADOW_STACK_PUSH
/* copied from: arch/arm64/include/asm/sysreg.h */
#define GCS_CAP_VALID_TOKEN 0x1
#define GCS_CAP_ADDR_MASK 0xFFFFFFFFFFFFF000ULL
#define GCS_CAP(x) ((((unsigned long)x) & GCS_CAP_ADDR_MASK) | GCS_CAP_VALID_TOKEN)
#define GCS_SIGNAL_CAP(addr) (((unsigned long)addr) & GCS_CAP_ADDR_MASK)
#include <asm/hwcap.h>
#ifndef HWCAP_GCS
#define HWCAP_GCS (1UL << 32)
#endif
#endif /* __UAPI_ASM_GCS_TYPES_H__ */