#define BAD_FIQ 2
#define BAD_ERROR 3
- .macro kernel_ventry label
+ .macro kernel_ventry, el, label, regsize = 64
.align 7
+#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
+alternative_if ARM64_UNMAP_KERNEL_AT_EL0
+ .if \el == 0
+ .if \regsize == 64
+ mrs x30, tpidrro_el0
+ msr tpidrro_el0, xzr
+ .else
+ mov x30, xzr
+ .endif
+ .endif
+alternative_else_nop_endif
+#endif
+
sub sp, sp, #S_FRAME_SIZE
#ifdef CONFIG_VMAP_STACK
/*
tbnz x0, #THREAD_SHIFT, 0f
sub x0, sp, x0 // x0'' = sp' - x0' = (sp + x0) - sp = x0
sub sp, sp, x0 // sp'' = sp' - x0 = (sp + x0) - x0 = sp
- b \label
+ b el\()\el\()_\label
0:
/*
sub sp, sp, x0
mrs x0, tpidrro_el0
#endif
- b \label
+ b el\()\el\()_\label
+ .endm
+
+ .macro tramp_alias, dst, sym
+ mov_q \dst, TRAMP_VALIAS
+ add \dst, \dst, #(\sym - .entry.tramp.text)
.endm
.macro kernel_entry, el, regsize = 64
.else
add x21, sp, #S_FRAME_SIZE
get_thread_info tsk
- /* Save the task's original addr_limit and set USER_DS (TASK_SIZE_64) */
+ /* Save the task's original addr_limit and set USER_DS */
ldr x20, [tsk, #TSK_TI_ADDR_LIMIT]
str x20, [sp, #S_ORIG_ADDR_LIMIT]
- mov x20, #TASK_SIZE_64
+ mov x20, #USER_DS
str x20, [tsk, #TSK_TI_ADDR_LIMIT]
/* No need to reset PSTATE.UAO, hardware's already set it to 0 for us */
.endif /* \el == 0 */
alternative_else_nop_endif
.if \el != 0
- mrs x21, ttbr1_el1
- tst x21, #0xffff << 48 // Check for the reserved ASID
+ mrs x21, ttbr0_el1
+ tst x21, #TTBR_ASID_MASK // Check for the reserved ASID
orr x23, x23, #PSR_PAN_BIT // Set the emulated PAN in the saved SPSR
b.eq 1f // TTBR0 access already disabled
and x23, x23, #~PSR_PAN_BIT // Clear the emulated PAN in the saved SPSR
* Cavium erratum 27456 (broadcast TLBI instructions may cause I-cache
* corruption).
*/
- post_ttbr_update_workaround
+ bl post_ttbr_update_workaround
.endif
1:
.if \el != 0
.if \el == 0
ldr x23, [sp, #S_SP] // load return stack pointer
msr sp_el0, x23
+ tst x22, #PSR_MODE32_BIT // native task?
+ b.eq 3f
+
#ifdef CONFIG_ARM64_ERRATUM_845719
alternative_if ARM64_WORKAROUND_845719
- tbz x22, #4, 1f
#ifdef CONFIG_PID_IN_CONTEXTIDR
mrs x29, contextidr_el1
msr contextidr_el1, x29
#else
msr contextidr_el1, xzr
#endif
-1:
alternative_else_nop_endif
#endif
+3:
.endif
msr elr_el1, x21 // set up the return data
ldp x28, x29, [sp, #16 * 14]
ldr lr, [sp, #S_LR]
add sp, sp, #S_FRAME_SIZE // restore sp
- eret // return to kernel
+
+ .if \el == 0
+alternative_insn eret, nop, ARM64_UNMAP_KERNEL_AT_EL0
+#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
+ bne 4f
+ msr far_el1, x30
+ tramp_alias x30, tramp_exit_native
+ br x30
+4:
+ tramp_alias x30, tramp_exit_compat
+ br x30
+#endif
+ .else
+ eret
+ .endif
.endm
.macro irq_stack_entry
* x7 is reserved for the system call number in 32-bit mode.
*/
wsc_nr .req w25 // number of system calls
+xsc_nr .req x25 // number of system calls (zero-extended)
wscno .req w26 // syscall number
xscno .req x26 // syscall number (zero-extended)
stbl .req x27 // syscall table pointer
.align 11
ENTRY(vectors)
- kernel_ventry el1_sync_invalid // Synchronous EL1t
- kernel_ventry el1_irq_invalid // IRQ EL1t
- kernel_ventry el1_fiq_invalid // FIQ EL1t
- kernel_ventry el1_error_invalid // Error EL1t
+ kernel_ventry 1, sync_invalid // Synchronous EL1t
+ kernel_ventry 1, irq_invalid // IRQ EL1t
+ kernel_ventry 1, fiq_invalid // FIQ EL1t
+ kernel_ventry 1, error_invalid // Error EL1t
- kernel_ventry el1_sync // Synchronous EL1h
- kernel_ventry el1_irq // IRQ EL1h
- kernel_ventry el1_fiq_invalid // FIQ EL1h
- kernel_ventry el1_error_invalid // Error EL1h
+ kernel_ventry 1, sync // Synchronous EL1h
+ kernel_ventry 1, irq // IRQ EL1h
+ kernel_ventry 1, fiq_invalid // FIQ EL1h
+ kernel_ventry 1, error_invalid // Error EL1h
- kernel_ventry el0_sync // Synchronous 64-bit EL0
- kernel_ventry el0_irq // IRQ 64-bit EL0
- kernel_ventry el0_fiq_invalid // FIQ 64-bit EL0
- kernel_ventry el0_error_invalid // Error 64-bit EL0
+ kernel_ventry 0, sync // Synchronous 64-bit EL0
+ kernel_ventry 0, irq // IRQ 64-bit EL0
+ kernel_ventry 0, fiq_invalid // FIQ 64-bit EL0
+ kernel_ventry 0, error_invalid // Error 64-bit EL0
#ifdef CONFIG_COMPAT
- kernel_ventry el0_sync_compat // Synchronous 32-bit EL0
- kernel_ventry el0_irq_compat // IRQ 32-bit EL0
- kernel_ventry el0_fiq_invalid_compat // FIQ 32-bit EL0
- kernel_ventry el0_error_invalid_compat // Error 32-bit EL0
+ kernel_ventry 0, sync_compat, 32 // Synchronous 32-bit EL0
+ kernel_ventry 0, irq_compat, 32 // IRQ 32-bit EL0
+ kernel_ventry 0, fiq_invalid_compat, 32 // FIQ 32-bit EL0
+ kernel_ventry 0, error_invalid_compat, 32 // Error 32-bit EL0
#else
- kernel_ventry el0_sync_invalid // Synchronous 32-bit EL0
- kernel_ventry el0_irq_invalid // IRQ 32-bit EL0
- kernel_ventry el0_fiq_invalid // FIQ 32-bit EL0
- kernel_ventry el0_error_invalid // Error 32-bit EL0
+ kernel_ventry 0, sync_invalid, 32 // Synchronous 32-bit EL0
+ kernel_ventry 0, irq_invalid, 32 // IRQ 32-bit EL0
+ kernel_ventry 0, fiq_invalid, 32 // FIQ 32-bit EL0
+ kernel_ventry 0, error_invalid, 32 // Error 32-bit EL0
#endif
END(vectors)
b.ne __sys_trace
cmp wscno, wsc_nr // check upper syscall limit
b.hs ni_sys
+ mask_nospec64 xscno, xsc_nr, x19 // enforce bounds for syscall number
ldr x16, [stbl, xscno, lsl #3] // address in the syscall table
blr x16 // call sys_* routine
b ret_fast_syscall
sub \tmp, \tmp, #(SWAPPER_DIR_SIZE + RESERVED_TTBR0_SIZE)
bic \tmp, \tmp, #USER_ASID_FLAG
msr ttbr1_el1, \tmp
+#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
+alternative_if ARM64_WORKAROUND_QCOM_FALKOR_E1003
+ /* ASID already in \tmp[63:48] */
+ movk \tmp, #:abs_g2_nc:(TRAMP_VALIAS >> 12)
+ movk \tmp, #:abs_g1_nc:(TRAMP_VALIAS >> 12)
+ /* 2MB boundary containing the vectors, so we nobble the walk cache */
+ movk \tmp, #:abs_g0_nc:((TRAMP_VALIAS & ~(SZ_2M - 1)) >> 12)
+ isb
+ tlbi vae1, \tmp
+ dsb nsh
+alternative_else_nop_endif
+#endif /* CONFIG_QCOM_FALKOR_ERRATUM_1003 */
.endm
.macro tramp_unmap_kernel, tmp
orr \tmp, \tmp, #USER_ASID_FLAG
msr ttbr1_el1, \tmp
/*
- * We avoid running the post_ttbr_update_workaround here because the
- * user and kernel ASIDs don't have conflicting mappings, so any
- * "blessing" as described in:
- *
- * http://lkml.kernel.org/r/56BB848A.6060603@caviumnetworks.com
- *
- * will not hurt correctness. Whilst this may partially defeat the
- * point of using split ASIDs in the first place, it avoids
- * the hit of invalidating the entire I-cache on every return to
- * userspace.
+ * We avoid running the post_ttbr_update_workaround here because
+ * it's only needed by Cavium ThunderX, which requires KPTI to be
+ * disabled.
*/
.endm
.if \regsize == 64
msr tpidrro_el0, x30 // Restored in kernel_ventry
.endif
+ /*
+ * Defend against branch aliasing attacks by pushing a dummy
+ * entry onto the return stack and using a RET instruction to
+ * enter the full-fat kernel vectors.
+ */
+ bl 2f
+ b .
+2:
tramp_map_kernel x30
+#ifdef CONFIG_RANDOMIZE_BASE
+ adr x30, tramp_vectors + PAGE_SIZE
+alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003
+ ldr x30, [x30]
+#else
ldr x30, =vectors
+#endif
prfm plil1strm, [x30, #(1b - tramp_vectors)]
msr vbar_el1, x30
add x30, x30, #(1b - tramp_vectors)
isb
- br x30
+ ret
.endm
.macro tramp_exit, regsize = 64
.ltorg
.popsection // .entry.tramp.text
+#ifdef CONFIG_RANDOMIZE_BASE
+ .pushsection ".rodata", "a"
+ .align PAGE_SHIFT
+ .globl __entry_tramp_data_start
+__entry_tramp_data_start:
+ .quad vectors
+ .popsection // .rodata
+#endif /* CONFIG_RANDOMIZE_BASE */
#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
/*
projects / mirror_ubuntu-artful-kernel.git / blobdiff