mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 22:06:45 +07:00
bd38967d40
This patch moves the directly coded alternatives for turning PAN on/off
into separate uaccess_{enable,disable} macros or functions. The asm
macros take a few arguments which will be used in subsequent patches.
Note that any (unlikely) access that the compiler might generate between
uaccess_enable() and uaccess_disable(), other than those explicitly
specified by the user access code, will not be protected by PAN.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_FUTEX_H
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#define __ASM_FUTEX_H
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#ifdef __KERNEL__
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#include <linux/futex.h>
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#include <linux/uaccess.h>
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#include <asm/errno.h>
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#define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg) \
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do { \
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uaccess_enable(); \
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asm volatile( \
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" prfm pstl1strm, %2\n" \
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"1: ldxr %w1, %2\n" \
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insn "\n" \
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"2: stlxr %w3, %w0, %2\n" \
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" cbnz %w3, 1b\n" \
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" dmb ish\n" \
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"3:\n" \
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" .pushsection .fixup,\"ax\"\n" \
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" .align 2\n" \
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"4: mov %w0, %w5\n" \
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" b 3b\n" \
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" .popsection\n" \
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_ASM_EXTABLE(1b, 4b) \
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_ASM_EXTABLE(2b, 4b) \
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: "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp) \
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: "r" (oparg), "Ir" (-EFAULT) \
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: "memory"); \
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uaccess_disable(); \
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} while (0)
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static inline int
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futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
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{
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int op = (encoded_op >> 28) & 7;
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int cmp = (encoded_op >> 24) & 15;
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int oparg = (encoded_op << 8) >> 20;
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int cmparg = (encoded_op << 20) >> 20;
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int oldval = 0, ret, tmp;
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if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
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oparg = 1 << oparg;
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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
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return -EFAULT;
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pagefault_disable();
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switch (op) {
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case FUTEX_OP_SET:
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__futex_atomic_op("mov %w0, %w4",
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ret, oldval, uaddr, tmp, oparg);
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break;
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case FUTEX_OP_ADD:
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__futex_atomic_op("add %w0, %w1, %w4",
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ret, oldval, uaddr, tmp, oparg);
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break;
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case FUTEX_OP_OR:
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__futex_atomic_op("orr %w0, %w1, %w4",
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ret, oldval, uaddr, tmp, oparg);
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break;
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case FUTEX_OP_ANDN:
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__futex_atomic_op("and %w0, %w1, %w4",
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ret, oldval, uaddr, tmp, ~oparg);
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break;
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case FUTEX_OP_XOR:
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__futex_atomic_op("eor %w0, %w1, %w4",
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ret, oldval, uaddr, tmp, oparg);
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break;
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default:
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ret = -ENOSYS;
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}
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pagefault_enable();
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if (!ret) {
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switch (cmp) {
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case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
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case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
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case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
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case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
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case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
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case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
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default: ret = -ENOSYS;
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}
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}
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return ret;
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}
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static inline int
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futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
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u32 oldval, u32 newval)
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{
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int ret = 0;
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u32 val, tmp;
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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
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return -EFAULT;
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uaccess_enable();
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asm volatile("// futex_atomic_cmpxchg_inatomic\n"
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" prfm pstl1strm, %2\n"
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"1: ldxr %w1, %2\n"
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" sub %w3, %w1, %w4\n"
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" cbnz %w3, 3f\n"
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"2: stlxr %w3, %w5, %2\n"
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" cbnz %w3, 1b\n"
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" dmb ish\n"
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"3:\n"
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" .pushsection .fixup,\"ax\"\n"
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"4: mov %w0, %w6\n"
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" b 3b\n"
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" .popsection\n"
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_ASM_EXTABLE(1b, 4b)
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_ASM_EXTABLE(2b, 4b)
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: "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp)
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: "r" (oldval), "r" (newval), "Ir" (-EFAULT)
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: "memory");
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uaccess_disable();
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*uval = val;
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return ret;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_FUTEX_H */
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