mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-09-21 11:53:01 +00:00
621be26198
commit 653bc77af60911ead1f423e588f54fc2547c4957 upstream.
Rusty noticed a Really Bad Bug (tm) in my NT fix. The entry code
reads out of bounds, causing the NT fix to be unreliable. But, and
this is much, much worse, if your stack is somehow just below the
top of the direct map (or a hole), you read out of bounds and crash.
Excerpt from the crash:
[ 1.129513] RSP: 0018:ffff88001da4bf88 EFLAGS: 00010296
2b:* f7 84 24 90 00 00 00 testl $0x4000,0x90(%rsp)
That read is deterministically above the top of the stack. I
thought I even single-stepped through this code when I wrote it to
check the offset, but I clearly screwed it up.
Fixes: 8c7aa698baca ("x86_64, entry: Filter RFLAGS.NT on entry from userspace")
Reported-by: Rusty Russell <rusty@ozlabs.org>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
515 lines
14 KiB
ArmAsm
515 lines
14 KiB
ArmAsm
/*
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* Compatibility mode system call entry point for x86-64.
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*
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* Copyright 2000-2002 Andi Kleen, SuSE Labs.
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*/
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#include <asm/dwarf2.h>
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#include <asm/calling.h>
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#include <asm/asm-offsets.h>
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#include <asm/current.h>
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#include <asm/errno.h>
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#include <asm/ia32_unistd.h>
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#include <asm/thread_info.h>
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#include <asm/segment.h>
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#include <asm/irqflags.h>
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#include <asm/asm.h>
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#include <asm/smap.h>
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#include <linux/linkage.h>
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#include <linux/err.h>
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/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
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#include <linux/elf-em.h>
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#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
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#define __AUDIT_ARCH_LE 0x40000000
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#ifndef CONFIG_AUDITSYSCALL
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#define sysexit_audit ia32_ret_from_sys_call
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#define sysretl_audit ia32_ret_from_sys_call
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#endif
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.section .entry.text, "ax"
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.macro IA32_ARG_FIXUP noebp=0
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movl %edi,%r8d
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.if \noebp
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.else
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movl %ebp,%r9d
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.endif
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xchg %ecx,%esi
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movl %ebx,%edi
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movl %edx,%edx /* zero extension */
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.endm
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/* clobbers %eax */
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.macro CLEAR_RREGS offset=0, _r9=rax
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xorl %eax,%eax
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movq %rax,\offset+R11(%rsp)
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movq %rax,\offset+R10(%rsp)
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movq %\_r9,\offset+R9(%rsp)
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movq %rax,\offset+R8(%rsp)
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.endm
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/*
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* Reload arg registers from stack in case ptrace changed them.
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* We don't reload %eax because syscall_trace_enter() returned
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* the %rax value we should see. Instead, we just truncate that
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* value to 32 bits again as we did on entry from user mode.
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* If it's a new value set by user_regset during entry tracing,
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* this matches the normal truncation of the user-mode value.
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* If it's -1 to make us punt the syscall, then (u32)-1 is still
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* an appropriately invalid value.
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*/
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.macro LOAD_ARGS32 offset, _r9=0
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.if \_r9
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movl \offset+16(%rsp),%r9d
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.endif
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movl \offset+40(%rsp),%ecx
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movl \offset+48(%rsp),%edx
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movl \offset+56(%rsp),%esi
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movl \offset+64(%rsp),%edi
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movl %eax,%eax /* zero extension */
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.endm
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.macro CFI_STARTPROC32 simple
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CFI_STARTPROC \simple
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CFI_UNDEFINED r8
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CFI_UNDEFINED r9
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CFI_UNDEFINED r10
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CFI_UNDEFINED r11
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CFI_UNDEFINED r12
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CFI_UNDEFINED r13
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CFI_UNDEFINED r14
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CFI_UNDEFINED r15
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.endm
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#ifdef CONFIG_PARAVIRT
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ENTRY(native_usergs_sysret32)
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swapgs
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sysretl
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ENDPROC(native_usergs_sysret32)
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ENTRY(native_irq_enable_sysexit)
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swapgs
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sti
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sysexit
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ENDPROC(native_irq_enable_sysexit)
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#endif
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/*
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* 32bit SYSENTER instruction entry.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx Arg2
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp user stack
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* 0(%ebp) Arg6
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*
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* Interrupts off.
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*
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* This is purely a fast path. For anything complicated we use the int 0x80
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* path below. Set up a complete hardware stack frame to share code
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* with the int 0x80 path.
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*/
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ENTRY(ia32_sysenter_target)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,0
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CFI_REGISTER rsp,rbp
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SWAPGS_UNSAFE_STACK
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movq PER_CPU_VAR(kernel_stack), %rsp
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addq $(KERNEL_STACK_OFFSET),%rsp
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs, here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %ebp,%ebp /* zero extension */
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pushq_cfi $__USER32_DS
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/*CFI_REL_OFFSET ss,0*/
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pushq_cfi %rbp
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CFI_REL_OFFSET rsp,0
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pushfq_cfi
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/*CFI_REL_OFFSET rflags,0*/
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movl TI_sysenter_return+THREAD_INFO(%rsp,3*8-KERNEL_STACK_OFFSET),%r10d
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CFI_REGISTER rip,r10
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pushq_cfi $__USER32_CS
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/*CFI_REL_OFFSET cs,0*/
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movl %eax, %eax
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pushq_cfi %r10
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CFI_REL_OFFSET rip,0
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pushq_cfi %rax
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cld
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SAVE_ARGS 0,1,0
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/* no need to do an access_ok check here because rbp has been
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32bit zero extended */
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ASM_STAC
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1: movl (%rbp),%ebp
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_ASM_EXTABLE(1b,ia32_badarg)
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ASM_CLAC
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/*
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* Sysenter doesn't filter flags, so we need to clear NT
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* ourselves. To save a few cycles, we can check whether
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* NT was set instead of doing an unconditional popfq.
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*/
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testl $X86_EFLAGS_NT,EFLAGS-ARGOFFSET(%rsp)
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jnz sysenter_fix_flags
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sysenter_flags_fixed:
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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CFI_REMEMBER_STATE
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jnz sysenter_tracesys
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cmpq $(IA32_NR_syscalls-1),%rax
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ja ia32_badsys
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sysenter_do_call:
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IA32_ARG_FIXUP
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sysenter_dispatch:
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX-ARGOFFSET(%rsp)
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz sysexit_audit
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sysexit_from_sys_call:
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andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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/* clear IF, that popfq doesn't enable interrupts early */
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andl $~0x200,EFLAGS-R11(%rsp)
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movl RIP-R11(%rsp),%edx /* User %eip */
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CFI_REGISTER rip,rdx
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RESTORE_ARGS 0,24,0,0,0,0
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xorq %r8,%r8
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xorq %r9,%r9
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xorq %r10,%r10
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xorq %r11,%r11
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popfq_cfi
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/*CFI_RESTORE rflags*/
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popq_cfi %rcx /* User %esp */
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CFI_REGISTER rsp,rcx
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS_SYSEXIT32
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CFI_RESTORE_STATE
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#ifdef CONFIG_AUDITSYSCALL
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.macro auditsys_entry_common
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movl %esi,%r9d /* 6th arg: 4th syscall arg */
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movl %edx,%r8d /* 5th arg: 3rd syscall arg */
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/* (already in %ecx) 4th arg: 2nd syscall arg */
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movl %ebx,%edx /* 3rd arg: 1st syscall arg */
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movl %eax,%esi /* 2nd arg: syscall number */
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movl $AUDIT_ARCH_I386,%edi /* 1st arg: audit arch */
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call __audit_syscall_entry
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movl RAX-ARGOFFSET(%rsp),%eax /* reload syscall number */
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cmpq $(IA32_NR_syscalls-1),%rax
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ja ia32_badsys
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movl %ebx,%edi /* reload 1st syscall arg */
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movl RCX-ARGOFFSET(%rsp),%esi /* reload 2nd syscall arg */
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movl RDX-ARGOFFSET(%rsp),%edx /* reload 3rd syscall arg */
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movl RSI-ARGOFFSET(%rsp),%ecx /* reload 4th syscall arg */
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movl RDI-ARGOFFSET(%rsp),%r8d /* reload 5th syscall arg */
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.endm
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.macro auditsys_exit exit
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testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz ia32_ret_from_sys_call
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %eax,%esi /* second arg, syscall return value */
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cmpl $-MAX_ERRNO,%eax /* is it an error ? */
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jbe 1f
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movslq %eax, %rsi /* if error sign extend to 64 bits */
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1: setbe %al /* 1 if error, 0 if not */
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movzbl %al,%edi /* zero-extend that into %edi */
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call __audit_syscall_exit
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movq RAX-ARGOFFSET(%rsp),%rax /* reload syscall return value */
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl %edi,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz \exit
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CLEAR_RREGS -ARGOFFSET
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jmp int_with_check
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.endm
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sysenter_auditsys:
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auditsys_entry_common
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movl %ebp,%r9d /* reload 6th syscall arg */
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jmp sysenter_dispatch
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sysexit_audit:
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auditsys_exit sysexit_from_sys_call
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#endif
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sysenter_fix_flags:
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pushq_cfi $(X86_EFLAGS_IF|X86_EFLAGS_FIXED)
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popfq_cfi
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jmp sysenter_flags_fixed
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sysenter_tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz sysenter_auditsys
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#endif
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SAVE_REST
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CLEAR_RREGS
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movq $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
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RESTORE_REST
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cmpq $(IA32_NR_syscalls-1),%rax
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ja int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
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jmp sysenter_do_call
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CFI_ENDPROC
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ENDPROC(ia32_sysenter_target)
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/*
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* 32bit SYSCALL instruction entry.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx return EIP
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp Arg2 [note: not saved in the stack frame, should not be touched]
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* %esp user stack
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* 0(%esp) Arg6
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*
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* Interrupts off.
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*
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* This is purely a fast path. For anything complicated we use the int 0x80
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* path below. Set up a complete hardware stack frame to share code
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* with the int 0x80 path.
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*/
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ENTRY(ia32_cstar_target)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,KERNEL_STACK_OFFSET
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CFI_REGISTER rip,rcx
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/*CFI_REGISTER rflags,r11*/
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SWAPGS_UNSAFE_STACK
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movl %esp,%r8d
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CFI_REGISTER rsp,r8
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movq PER_CPU_VAR(kernel_stack),%rsp
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs and here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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SAVE_ARGS 8,0,0
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movl %eax,%eax /* zero extension */
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movq %rax,ORIG_RAX-ARGOFFSET(%rsp)
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movq %rcx,RIP-ARGOFFSET(%rsp)
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CFI_REL_OFFSET rip,RIP-ARGOFFSET
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movq %rbp,RCX-ARGOFFSET(%rsp) /* this lies slightly to ptrace */
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movl %ebp,%ecx
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movq $__USER32_CS,CS-ARGOFFSET(%rsp)
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movq $__USER32_DS,SS-ARGOFFSET(%rsp)
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movq %r11,EFLAGS-ARGOFFSET(%rsp)
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/*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
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movq %r8,RSP-ARGOFFSET(%rsp)
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CFI_REL_OFFSET rsp,RSP-ARGOFFSET
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/* no need to do an access_ok check here because r8 has been
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32bit zero extended */
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/* hardware stack frame is complete now */
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ASM_STAC
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1: movl (%r8),%r9d
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_ASM_EXTABLE(1b,ia32_badarg)
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ASM_CLAC
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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CFI_REMEMBER_STATE
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jnz cstar_tracesys
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cmpq $IA32_NR_syscalls-1,%rax
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ja ia32_badsys
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cstar_do_call:
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IA32_ARG_FIXUP 1
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cstar_dispatch:
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX-ARGOFFSET(%rsp)
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz sysretl_audit
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sysretl_from_sys_call:
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andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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RESTORE_ARGS 0,-ARG_SKIP,0,0,0
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movl RIP-ARGOFFSET(%rsp),%ecx
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CFI_REGISTER rip,rcx
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movl EFLAGS-ARGOFFSET(%rsp),%r11d
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/*CFI_REGISTER rflags,r11*/
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xorq %r10,%r10
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xorq %r9,%r9
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xorq %r8,%r8
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TRACE_IRQS_ON
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movl RSP-ARGOFFSET(%rsp),%esp
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CFI_RESTORE rsp
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USERGS_SYSRET32
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#ifdef CONFIG_AUDITSYSCALL
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cstar_auditsys:
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CFI_RESTORE_STATE
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movl %r9d,R9-ARGOFFSET(%rsp) /* register to be clobbered by call */
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auditsys_entry_common
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movl R9-ARGOFFSET(%rsp),%r9d /* reload 6th syscall arg */
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jmp cstar_dispatch
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sysretl_audit:
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auditsys_exit sysretl_from_sys_call
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#endif
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cstar_tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz cstar_auditsys
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#endif
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xchgl %r9d,%ebp
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SAVE_REST
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CLEAR_RREGS 0, r9
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movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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LOAD_ARGS32 ARGOFFSET, 1 /* reload args from stack in case ptrace changed it */
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RESTORE_REST
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xchgl %ebp,%r9d
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cmpq $(IA32_NR_syscalls-1),%rax
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ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
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jmp cstar_do_call
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END(ia32_cstar_target)
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ia32_badarg:
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ASM_CLAC
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movq $-EFAULT,%rax
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jmp ia32_sysret
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CFI_ENDPROC
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/*
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* Emulated IA32 system calls via int 0x80.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx Arg2
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp Arg6 [note: not saved in the stack frame, should not be touched]
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*
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* Notes:
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* Uses the same stack frame as the x86-64 version.
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* All registers except %eax must be saved (but ptrace may violate that)
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* Arguments are zero extended. For system calls that want sign extension and
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* take long arguments a wrapper is needed. Most calls can just be called
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* directly.
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* Assumes it is only called from user space and entered with interrupts off.
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*/
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ENTRY(ia32_syscall)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,SS+8-RIP
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/*CFI_REL_OFFSET ss,SS-RIP*/
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CFI_REL_OFFSET rsp,RSP-RIP
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/*CFI_REL_OFFSET rflags,EFLAGS-RIP*/
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/*CFI_REL_OFFSET cs,CS-RIP*/
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CFI_REL_OFFSET rip,RIP-RIP
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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SWAPGS
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs and here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %eax,%eax
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pushq_cfi %rax
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cld
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/* note the registers are not zero extended to the sf.
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this could be a problem. */
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SAVE_ARGS 0,1,0
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
|
|
testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
|
|
jnz ia32_tracesys
|
|
cmpq $(IA32_NR_syscalls-1),%rax
|
|
ja ia32_badsys
|
|
ia32_do_call:
|
|
IA32_ARG_FIXUP
|
|
call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
|
|
ia32_sysret:
|
|
movq %rax,RAX-ARGOFFSET(%rsp)
|
|
ia32_ret_from_sys_call:
|
|
CLEAR_RREGS -ARGOFFSET
|
|
jmp int_ret_from_sys_call
|
|
|
|
ia32_tracesys:
|
|
SAVE_REST
|
|
CLEAR_RREGS
|
|
movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
|
|
movq %rsp,%rdi /* &pt_regs -> arg1 */
|
|
call syscall_trace_enter
|
|
LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
|
|
RESTORE_REST
|
|
cmpq $(IA32_NR_syscalls-1),%rax
|
|
ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */
|
|
jmp ia32_do_call
|
|
END(ia32_syscall)
|
|
|
|
ia32_badsys:
|
|
movq $0,ORIG_RAX-ARGOFFSET(%rsp)
|
|
movq $-ENOSYS,%rax
|
|
jmp ia32_sysret
|
|
|
|
CFI_ENDPROC
|
|
|
|
.macro PTREGSCALL label, func, arg
|
|
ALIGN
|
|
GLOBAL(\label)
|
|
leaq \func(%rip),%rax
|
|
jmp ia32_ptregs_common
|
|
.endm
|
|
|
|
CFI_STARTPROC32
|
|
|
|
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn
|
|
PTREGSCALL stub32_sigreturn, sys32_sigreturn
|
|
PTREGSCALL stub32_execve, compat_sys_execve
|
|
PTREGSCALL stub32_fork, sys_fork
|
|
PTREGSCALL stub32_vfork, sys_vfork
|
|
|
|
ALIGN
|
|
GLOBAL(stub32_clone)
|
|
leaq sys_clone(%rip),%rax
|
|
mov %r8, %rcx
|
|
jmp ia32_ptregs_common
|
|
|
|
ALIGN
|
|
ia32_ptregs_common:
|
|
popq %r11
|
|
CFI_ENDPROC
|
|
CFI_STARTPROC32 simple
|
|
CFI_SIGNAL_FRAME
|
|
CFI_DEF_CFA rsp,SS+8-ARGOFFSET
|
|
CFI_REL_OFFSET rax,RAX-ARGOFFSET
|
|
CFI_REL_OFFSET rcx,RCX-ARGOFFSET
|
|
CFI_REL_OFFSET rdx,RDX-ARGOFFSET
|
|
CFI_REL_OFFSET rsi,RSI-ARGOFFSET
|
|
CFI_REL_OFFSET rdi,RDI-ARGOFFSET
|
|
CFI_REL_OFFSET rip,RIP-ARGOFFSET
|
|
/* CFI_REL_OFFSET cs,CS-ARGOFFSET*/
|
|
/* CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
|
|
CFI_REL_OFFSET rsp,RSP-ARGOFFSET
|
|
/* CFI_REL_OFFSET ss,SS-ARGOFFSET*/
|
|
SAVE_REST
|
|
call *%rax
|
|
RESTORE_REST
|
|
jmp ia32_sysret /* misbalances the return cache */
|
|
CFI_ENDPROC
|
|
END(ia32_ptregs_common)
|