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6d4a0fbd34
Disallow a module to load if SCS dynamic patching fails for its code. For module loading, instead of running a dry-run to check for patching errors, try to run patching in the first run and propagate any errors so module loading will fail. Signed-off-by: Adrian Barnaś <abarnas@google.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Will Deacon <will@kernel.org>
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SCS_H
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#define _ASM_SCS_H
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#ifdef __ASSEMBLY__
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#include <asm/asm-offsets.h>
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#include <asm/sysreg.h>
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#ifdef CONFIG_SHADOW_CALL_STACK
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scs_sp .req x18
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.macro scs_load_current
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get_current_task scs_sp
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ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP]
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.endm
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.macro scs_save tsk
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str scs_sp, [\tsk, #TSK_TI_SCS_SP]
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.endm
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#else
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.macro scs_load_current
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.endm
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.macro scs_save tsk
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.endm
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#endif /* CONFIG_SHADOW_CALL_STACK */
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#else
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#include <linux/scs.h>
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#include <asm/cpufeature.h>
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#ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS
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static inline void dynamic_scs_init(void)
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{
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extern bool __pi_dynamic_scs_is_enabled;
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if (__pi_dynamic_scs_is_enabled) {
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pr_info("Enabling dynamic shadow call stack\n");
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static_branch_enable(&dynamic_scs_enabled);
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}
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}
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#else
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static inline void dynamic_scs_init(void) {}
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#endif
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enum {
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EDYNSCS_INVALID_CIE_HEADER = 1,
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EDYNSCS_INVALID_CIE_SDATA_SIZE = 2,
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EDYNSCS_INVALID_FDE_AUGM_DATA_SIZE = 3,
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EDYNSCS_INVALID_CFA_OPCODE = 4,
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};
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int __pi_scs_patch(const u8 eh_frame[], int size, bool skip_dry_run);
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#endif /* __ASSEMBLY __ */
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#endif /* _ASM_SCS_H */
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