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133 lines
3.3 KiB
133 lines
3.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _PKEYS_POWERPC_H |
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#define _PKEYS_POWERPC_H |
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#ifndef SYS_mprotect_key |
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# define SYS_mprotect_key 386 |
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#endif |
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#ifndef SYS_pkey_alloc |
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# define SYS_pkey_alloc 384 |
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# define SYS_pkey_free 385 |
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#endif |
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#define REG_IP_IDX PT_NIP |
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#define REG_TRAPNO PT_TRAP |
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#define gregs gp_regs |
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#define fpregs fp_regs |
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#define si_pkey_offset 0x20 |
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#undef PKEY_DISABLE_ACCESS |
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#define PKEY_DISABLE_ACCESS 0x3 /* disable read and write */ |
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#undef PKEY_DISABLE_WRITE |
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#define PKEY_DISABLE_WRITE 0x2 |
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#define NR_PKEYS 32 |
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#define NR_RESERVED_PKEYS_4K 27 /* pkey-0, pkey-1, exec-only-pkey |
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and 24 other keys that cannot be |
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represented in the PTE */ |
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#define NR_RESERVED_PKEYS_64K_3KEYS 3 /* PowerNV and KVM: pkey-0, |
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pkey-1 and exec-only key */ |
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#define NR_RESERVED_PKEYS_64K_4KEYS 4 /* PowerVM: pkey-0, pkey-1, |
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pkey-31 and exec-only key */ |
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#define PKEY_BITS_PER_PKEY 2 |
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#define HPAGE_SIZE (1UL << 24) |
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#define PAGE_SIZE sysconf(_SC_PAGESIZE) |
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static inline u32 pkey_bit_position(int pkey) |
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{ |
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return (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY; |
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} |
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static inline u64 __read_pkey_reg(void) |
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{ |
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u64 pkey_reg; |
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asm volatile("mfspr %0, 0xd" : "=r" (pkey_reg)); |
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return pkey_reg; |
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} |
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static inline void __write_pkey_reg(u64 pkey_reg) |
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{ |
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u64 amr = pkey_reg; |
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dprintf4("%s() changing %016llx to %016llx\n", |
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__func__, __read_pkey_reg(), pkey_reg); |
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asm volatile("isync; mtspr 0xd, %0; isync" |
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: : "r" ((unsigned long)(amr)) : "memory"); |
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dprintf4("%s() pkey register after changing %016llx to %016llx\n", |
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__func__, __read_pkey_reg(), pkey_reg); |
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} |
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static inline int cpu_has_pkeys(void) |
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{ |
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/* No simple way to determine this */ |
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return 1; |
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} |
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static inline bool arch_is_powervm() |
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{ |
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struct stat buf; |
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if ((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) && |
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(stat("/sys/firmware/devicetree/base/hmc-managed?", &buf) == 0) && |
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(stat("/sys/firmware/devicetree/base/chosen/qemu,graphic-width", &buf) == -1) ) |
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return true; |
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return false; |
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} |
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static inline int get_arch_reserved_keys(void) |
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{ |
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if (sysconf(_SC_PAGESIZE) == 4096) |
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return NR_RESERVED_PKEYS_4K; |
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else |
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if (arch_is_powervm()) |
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return NR_RESERVED_PKEYS_64K_4KEYS; |
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else |
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return NR_RESERVED_PKEYS_64K_3KEYS; |
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} |
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void expect_fault_on_read_execonly_key(void *p1, int pkey) |
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{ |
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/* |
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* powerpc does not allow userspace to change permissions of exec-only |
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* keys since those keys are not allocated by userspace. The signal |
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* handler wont be able to reset the permissions, which means the code |
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* will infinitely continue to segfault here. |
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*/ |
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return; |
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} |
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/* 4-byte instructions * 16384 = 64K page */ |
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#define __page_o_noops() asm(".rept 16384 ; nop; .endr") |
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void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey) |
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{ |
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void *ptr; |
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int ret; |
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dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__, |
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size, prot, pkey); |
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pkey_assert(pkey < NR_PKEYS); |
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ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); |
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pkey_assert(ptr != (void *)-1); |
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ret = syscall(__NR_subpage_prot, ptr, size, NULL); |
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if (ret) { |
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perror("subpage_perm"); |
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return PTR_ERR_ENOTSUP; |
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} |
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ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey); |
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pkey_assert(!ret); |
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record_pkey_malloc(ptr, size, prot); |
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dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr); |
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return ptr; |
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} |
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#endif /* _PKEYS_POWERPC_H */
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