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55b22075f7
Add SECCOMP and SECCOMP_FILTER support to the Alpha architecture and fix syscall entry and ptrace issues uncovered by the seccomp-bpf selftests. The syscall entry path is reworked to consistently track syscall state using r0, r1 and r2: - r1 holds the active syscall number - r2 preserves the original syscall number for restart - r0 carries the return value, with r19 (a3) indicating success/error This allows syscall restarts to be permitted only for valid ERESTART* return codes and prevents kernel-internal restart values from leaking to userspace. The syscall tracing error marker is corrected to use the saved syscall number slot, matching the Alpha ABI. Additionally, implement minimal PTRACE_GETREGSET and PTRACE_SETREGSET support for NT_PRSTATUS, exporting struct pt_regs directly. This fixes ptrace-based seccomp tests that previously failed with -EIO. With these changes, seccomp-bpf and ptrace syscall tests pass reliably on Alpha. Tested-by: Michael Cree <mcree@orcon.net.nz> Signed-off-by: Magnus Lindholm <linmag7@gmail.com> Link: https://lore.kernel.org/r/20260409171439.8759-2-linmag7@gmail.com Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
14 lines
375 B
C
14 lines
375 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_ALPHA_SECCOMP_H
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#define _ASM_ALPHA_SECCOMP_H
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#include <asm/unistd.h>
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#include <asm-generic/seccomp.h>
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#include <uapi/linux/audit.h>
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#define SECCOMP_ARCH_NATIVE AUDIT_ARCH_ALPHA
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#define SECCOMP_ARCH_NATIVE_NR NR_syscalls
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#define SECCOMP_ARCH_NATIVE_NAME "alpha"
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#endif /* _ASM_ALPHA_SECCOMP_H */
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