137 lines
2.8 KiB
C
137 lines
2.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright 2020, Sandipan Das, IBM Corp.
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*/
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#ifndef _SELFTESTS_POWERPC_PKEYS_H
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#define _SELFTESTS_POWERPC_PKEYS_H
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#include <sys/mman.h>
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#include "reg.h"
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#include "utils.h"
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/*
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* Older versions of libc use the Intel-specific access rights.
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* Hence, override the definitions as they might be incorrect.
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*/
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#undef PKEY_DISABLE_ACCESS
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#define PKEY_DISABLE_ACCESS 0x3
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#undef PKEY_DISABLE_WRITE
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#define PKEY_DISABLE_WRITE 0x2
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#undef PKEY_DISABLE_EXECUTE
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#define PKEY_DISABLE_EXECUTE 0x4
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/* Older versions of libc do not not define this */
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#ifndef SEGV_PKUERR
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#define SEGV_PKUERR 4
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#endif
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#define SI_PKEY_OFFSET 0x20
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#define __NR_pkey_mprotect 386
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#define __NR_pkey_alloc 384
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#define __NR_pkey_free 385
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#define PKEY_BITS_PER_PKEY 2
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#define NR_PKEYS 32
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#define PKEY_BITS_MASK ((1UL << PKEY_BITS_PER_PKEY) - 1)
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inline unsigned long pkeyreg_get(void)
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{
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return mfspr(SPRN_AMR);
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}
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inline void pkeyreg_set(unsigned long amr)
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{
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set_amr(amr);
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}
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void pkey_set_rights(int pkey, unsigned long rights)
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{
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unsigned long amr, shift;
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shift = (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY;
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amr = pkeyreg_get();
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amr &= ~(PKEY_BITS_MASK << shift);
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amr |= (rights & PKEY_BITS_MASK) << shift;
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pkeyreg_set(amr);
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}
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int sys_pkey_mprotect(void *addr, size_t len, int prot, int pkey)
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{
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return syscall(__NR_pkey_mprotect, addr, len, prot, pkey);
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}
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int sys_pkey_alloc(unsigned long flags, unsigned long rights)
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{
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return syscall(__NR_pkey_alloc, flags, rights);
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}
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int sys_pkey_free(int pkey)
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{
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return syscall(__NR_pkey_free, pkey);
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}
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int pkeys_unsupported(void)
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{
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bool hash_mmu = false;
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int pkey;
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/* Protection keys are currently supported on Hash MMU only */
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FAIL_IF(using_hash_mmu(&hash_mmu));
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SKIP_IF(!hash_mmu);
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/* Check if the system call is supported */
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pkey = sys_pkey_alloc(0, 0);
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SKIP_IF(pkey < 0);
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sys_pkey_free(pkey);
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return 0;
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}
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int siginfo_pkey(siginfo_t *si)
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{
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/*
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* In older versions of libc, siginfo_t does not have si_pkey as
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* a member.
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*/
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#ifdef si_pkey
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return si->si_pkey;
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#else
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return *((int *)(((char *) si) + SI_PKEY_OFFSET));
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#endif
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}
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#define pkey_rights(r) ({ \
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static char buf[4] = "rwx"; \
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unsigned int amr_bits; \
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if ((r) & PKEY_DISABLE_EXECUTE) \
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buf[2] = '-'; \
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amr_bits = (r) & PKEY_BITS_MASK; \
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if (amr_bits & PKEY_DISABLE_WRITE) \
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buf[1] = '-'; \
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if (amr_bits & PKEY_DISABLE_ACCESS & ~PKEY_DISABLE_WRITE) \
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buf[0] = '-'; \
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buf; \
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})
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unsigned long next_pkey_rights(unsigned long rights)
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{
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if (rights == PKEY_DISABLE_ACCESS)
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return PKEY_DISABLE_EXECUTE;
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else if (rights == (PKEY_DISABLE_ACCESS | PKEY_DISABLE_EXECUTE))
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return 0;
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if ((rights & PKEY_BITS_MASK) == 0)
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rights |= PKEY_DISABLE_WRITE;
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else if ((rights & PKEY_BITS_MASK) == PKEY_DISABLE_WRITE)
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rights |= PKEY_DISABLE_ACCESS;
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return rights;
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}
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#endif /* _SELFTESTS_POWERPC_PKEYS_H */
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