0b38b5e1d0
When userspace executes a syscall or gets interrupted,
BEAR contains a kernel address when returning to userspace.
This make it pretty easy to figure out where the kernel is
mapped even with KASLR enabled. To fix this, add lpswe to
lowcore and always execute it there, so userspace sees only
the lowcore address of lpswe. For this we have to extend
both critical_cleanup and the SWITCH_ASYNC macro to also check
for lpswe addresses in lowcore.
Fixes: b2d24b97b2 ("s390/kernel: add support for kernel address space layout randomization (KASLR)")
Cc: <stable@vger.kernel.org> # v5.2+
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
183 lines
5.7 KiB
C
183 lines
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2017
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*/
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#ifndef _ASM_S390_SETUP_H
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#define _ASM_S390_SETUP_H
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#include <linux/bits.h>
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#include <uapi/asm/setup.h>
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#include <linux/build_bug.h>
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#define EP_OFFSET 0x10008
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#define EP_STRING "S390EP"
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#define PARMAREA 0x10400
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#define EARLY_SCCB_OFFSET 0x11000
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#define HEAD_END 0x12000
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#define EARLY_SCCB_SIZE PAGE_SIZE
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/*
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* Machine features detected in early.c
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*/
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#define MACHINE_FLAG_VM BIT(0)
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#define MACHINE_FLAG_KVM BIT(1)
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#define MACHINE_FLAG_LPAR BIT(2)
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#define MACHINE_FLAG_DIAG9C BIT(3)
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#define MACHINE_FLAG_ESOP BIT(4)
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#define MACHINE_FLAG_IDTE BIT(5)
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#define MACHINE_FLAG_EDAT1 BIT(7)
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#define MACHINE_FLAG_EDAT2 BIT(8)
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#define MACHINE_FLAG_TOPOLOGY BIT(10)
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#define MACHINE_FLAG_TE BIT(11)
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#define MACHINE_FLAG_TLB_LC BIT(12)
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#define MACHINE_FLAG_VX BIT(13)
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#define MACHINE_FLAG_TLB_GUEST BIT(14)
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#define MACHINE_FLAG_NX BIT(15)
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#define MACHINE_FLAG_GS BIT(16)
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#define MACHINE_FLAG_SCC BIT(17)
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#define LPP_MAGIC BIT(31)
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#define LPP_PID_MASK _AC(0xffffffff, UL)
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/* Offsets to entry points in kernel/head.S */
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#define STARTUP_NORMAL_OFFSET 0x10000
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#define STARTUP_KDUMP_OFFSET 0x10010
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/* Offsets to parameters in kernel/head.S */
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#define IPL_DEVICE_OFFSET 0x10400
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#define INITRD_START_OFFSET 0x10408
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#define INITRD_SIZE_OFFSET 0x10410
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#define OLDMEM_BASE_OFFSET 0x10418
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#define OLDMEM_SIZE_OFFSET 0x10420
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#define KERNEL_VERSION_OFFSET 0x10428
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#define COMMAND_LINE_OFFSET 0x10480
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#ifndef __ASSEMBLY__
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#include <asm/lowcore.h>
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#include <asm/types.h>
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#define IPL_DEVICE (*(unsigned long *) (IPL_DEVICE_OFFSET))
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#define INITRD_START (*(unsigned long *) (INITRD_START_OFFSET))
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#define INITRD_SIZE (*(unsigned long *) (INITRD_SIZE_OFFSET))
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#define OLDMEM_BASE (*(unsigned long *) (OLDMEM_BASE_OFFSET))
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#define OLDMEM_SIZE (*(unsigned long *) (OLDMEM_SIZE_OFFSET))
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#define COMMAND_LINE ((char *) (COMMAND_LINE_OFFSET))
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struct parmarea {
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unsigned long ipl_device; /* 0x10400 */
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unsigned long initrd_start; /* 0x10408 */
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unsigned long initrd_size; /* 0x10410 */
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unsigned long oldmem_base; /* 0x10418 */
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unsigned long oldmem_size; /* 0x10420 */
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unsigned long kernel_version; /* 0x10428 */
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char pad1[0x10480 - 0x10430]; /* 0x10430 - 0x10480 */
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char command_line[ARCH_COMMAND_LINE_SIZE]; /* 0x10480 */
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};
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extern unsigned int zlib_dfltcc_support;
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#define ZLIB_DFLTCC_DISABLED 0
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#define ZLIB_DFLTCC_FULL 1
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#define ZLIB_DFLTCC_DEFLATE_ONLY 2
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#define ZLIB_DFLTCC_INFLATE_ONLY 3
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#define ZLIB_DFLTCC_FULL_DEBUG 4
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extern int noexec_disabled;
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extern int memory_end_set;
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extern unsigned long memory_end;
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extern unsigned long vmalloc_size;
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extern unsigned long max_physmem_end;
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extern unsigned long __swsusp_reset_dma;
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#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
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#define MACHINE_IS_KVM (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
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#define MACHINE_IS_LPAR (S390_lowcore.machine_flags & MACHINE_FLAG_LPAR)
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#define MACHINE_HAS_DIAG9C (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG9C)
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#define MACHINE_HAS_ESOP (S390_lowcore.machine_flags & MACHINE_FLAG_ESOP)
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#define MACHINE_HAS_IDTE (S390_lowcore.machine_flags & MACHINE_FLAG_IDTE)
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#define MACHINE_HAS_EDAT1 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT1)
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#define MACHINE_HAS_EDAT2 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT2)
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#define MACHINE_HAS_TOPOLOGY (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
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#define MACHINE_HAS_TE (S390_lowcore.machine_flags & MACHINE_FLAG_TE)
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#define MACHINE_HAS_TLB_LC (S390_lowcore.machine_flags & MACHINE_FLAG_TLB_LC)
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#define MACHINE_HAS_VX (S390_lowcore.machine_flags & MACHINE_FLAG_VX)
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#define MACHINE_HAS_TLB_GUEST (S390_lowcore.machine_flags & MACHINE_FLAG_TLB_GUEST)
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#define MACHINE_HAS_NX (S390_lowcore.machine_flags & MACHINE_FLAG_NX)
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#define MACHINE_HAS_GS (S390_lowcore.machine_flags & MACHINE_FLAG_GS)
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#define MACHINE_HAS_SCC (S390_lowcore.machine_flags & MACHINE_FLAG_SCC)
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/*
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* Console mode. Override with conmode=
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*/
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extern unsigned int console_mode;
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extern unsigned int console_devno;
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extern unsigned int console_irq;
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extern char vmhalt_cmd[];
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extern char vmpoff_cmd[];
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#define CONSOLE_IS_UNDEFINED (console_mode == 0)
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#define CONSOLE_IS_SCLP (console_mode == 1)
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#define CONSOLE_IS_3215 (console_mode == 2)
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#define CONSOLE_IS_3270 (console_mode == 3)
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#define CONSOLE_IS_VT220 (console_mode == 4)
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#define CONSOLE_IS_HVC (console_mode == 5)
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#define SET_CONSOLE_SCLP do { console_mode = 1; } while (0)
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#define SET_CONSOLE_3215 do { console_mode = 2; } while (0)
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#define SET_CONSOLE_3270 do { console_mode = 3; } while (0)
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#define SET_CONSOLE_VT220 do { console_mode = 4; } while (0)
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#define SET_CONSOLE_HVC do { console_mode = 5; } while (0)
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#ifdef CONFIG_PFAULT
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extern int pfault_init(void);
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extern void pfault_fini(void);
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#else /* CONFIG_PFAULT */
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#define pfault_init() ({-1;})
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#define pfault_fini() do { } while (0)
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#endif /* CONFIG_PFAULT */
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#ifdef CONFIG_VMCP
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void vmcp_cma_reserve(void);
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#else
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static inline void vmcp_cma_reserve(void) { }
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#endif
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void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault);
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void cmma_init(void);
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void cmma_init_nodat(void);
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extern void (*_machine_restart)(char *command);
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extern void (*_machine_halt)(void);
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extern void (*_machine_power_off)(void);
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extern unsigned long __kaslr_offset;
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static inline unsigned long kaslr_offset(void)
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{
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return __kaslr_offset;
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}
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static inline u32 gen_lpswe(unsigned long addr)
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{
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BUILD_BUG_ON(addr > 0xfff);
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return 0xb2b20000 | addr;
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}
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#else /* __ASSEMBLY__ */
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#define IPL_DEVICE (IPL_DEVICE_OFFSET)
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#define INITRD_START (INITRD_START_OFFSET)
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#define INITRD_SIZE (INITRD_SIZE_OFFSET)
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#define OLDMEM_BASE (OLDMEM_BASE_OFFSET)
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#define OLDMEM_SIZE (OLDMEM_SIZE_OFFSET)
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#define COMMAND_LINE (COMMAND_LINE_OFFSET)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_S390_SETUP_H */
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