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Merge branch 'x86/auditsc' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland
* 'x86/auditsc' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland: i386 syscall audit fast-path x86_64 ia32 syscall audit fast-path x86_64 syscall audit fast-path x86_64: remove bogus optimization in sysret_signal
This commit is contained in:
Linus Torvalds
commit
338b9bb3ad
@ -15,6 +15,16 @@
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#include <asm/irqflags.h>
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#include <linux/linkage.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 int_ret_from_sys_call
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#define sysretl_audit int_ret_from_sys_call
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#endif
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#define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
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.macro IA32_ARG_FIXUP noebp=0
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@ -148,13 +158,15 @@ ENTRY(ia32_sysenter_target)
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ja ia32_badsys
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sysenter_do_call:
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IA32_ARG_FIXUP 1
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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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GET_THREAD_INFO(%r10)
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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(%r10)
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jnz int_ret_from_sys_call
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jnz sysexit_audit
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sysexit_from_sys_call:
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andl $~TS_COMPAT,TI_status(%r10)
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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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@ -170,9 +182,63 @@ sysenter_do_call:
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS_SYSEXIT32
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sysenter_tracesys:
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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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cmpl $(IA32_NR_syscalls-1),%eax
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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(%r10)
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jnz int_ret_from_sys_call
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TRACE_IRQS_ON
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sti
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movl %eax,%esi /* second arg, syscall return value */
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cmpl $0,%eax /* is it < 0? */
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setl %al /* 1 if so, 0 if not */
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movzbl %al,%edi /* zero-extend that into %edi */
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inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
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call audit_syscall_exit
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GET_THREAD_INFO(%r10)
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movl RAX-ARGOFFSET(%rsp),%eax /* reload syscall return value */
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movl RBP-ARGOFFSET(%rsp),%ebp /* reload user register value */
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
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cli
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TRACE_IRQS_OFF
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testl %edi,TI_flags(%r10)
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jnz int_with_check
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jmp \exit
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.endm
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sysenter_auditsys:
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CFI_RESTORE_STATE
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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_tracesys:
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xchgl %r9d,%ebp
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
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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 %r9,R9(%rsp)
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@ -252,13 +318,15 @@ cstar_do_call:
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cmpl $IA32_NR_syscalls-1,%eax
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ja ia32_badsys
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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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GET_THREAD_INFO(%r10)
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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(%r10)
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jnz int_ret_from_sys_call
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jnz sysretl_audit
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sysretl_from_sys_call:
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andl $~TS_COMPAT,TI_status(%r10)
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RESTORE_ARGS 1,-ARG_SKIP,1,1,1
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movl RIP-ARGOFFSET(%rsp),%ecx
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@ -270,8 +338,23 @@ cstar_do_call:
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CFI_RESTORE rsp
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USERGS_SYSRET32
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cstar_tracesys:
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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(%r10)
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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
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@ -54,6 +54,16 @@
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#include <asm/ftrace.h>
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#include <asm/irq_vectors.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 sysenter_audit syscall_trace_entry
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#define sysexit_audit syscall_exit_work
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#endif
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/*
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* We use macros for low-level operations which need to be overridden
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* for paravirtualization. The following will never clobber any registers:
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@ -333,7 +343,8 @@ sysenter_past_esp:
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/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
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testw $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
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jnz syscall_trace_entry
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jnz sysenter_audit
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sysenter_do_call:
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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call *sys_call_table(,%eax,4)
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@ -343,7 +354,8 @@ sysenter_past_esp:
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx
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jne syscall_exit_work
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jne sysexit_audit
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sysenter_exit:
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/* if something modifies registers it must also disable sysexit */
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movl PT_EIP(%esp), %edx
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movl PT_OLDESP(%esp), %ecx
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@ -351,6 +363,45 @@ sysenter_past_esp:
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TRACE_IRQS_ON
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1: mov PT_FS(%esp), %fs
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ENABLE_INTERRUPTS_SYSEXIT
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#ifdef CONFIG_AUDITSYSCALL
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sysenter_audit:
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testw $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
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jnz syscall_trace_entry
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addl $4,%esp
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CFI_ADJUST_CFA_OFFSET -4
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/* %esi already in 8(%esp) 6th arg: 4th syscall arg */
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/* %edx already in 4(%esp) 5th arg: 3rd syscall arg */
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/* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */
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movl %ebx,%ecx /* 3rd arg: 1st syscall arg */
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movl %eax,%edx /* 2nd arg: syscall number */
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movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */
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call audit_syscall_entry
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pushl %ebx
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CFI_ADJUST_CFA_OFFSET 4
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movl PT_EAX(%esp),%eax /* reload syscall number */
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jmp sysenter_do_call
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sysexit_audit:
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testw $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %cx
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jne syscall_exit_work
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_ANY)
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movl %eax,%edx /* second arg, syscall return value */
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cmpl $0,%eax /* is it < 0? */
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setl %al /* 1 if so, 0 if not */
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movzbl %al,%eax /* zero-extend that */
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inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
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call audit_syscall_exit
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DISABLE_INTERRUPTS(CLBR_ANY)
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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testw $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %cx
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jne syscall_exit_work
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movl PT_EAX(%esp),%eax /* reload syscall return value */
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jmp sysenter_exit
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#endif
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CFI_ENDPROC
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.pushsection .fixup,"ax"
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2: movl $0,PT_FS(%esp)
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@ -53,6 +53,12 @@
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#include <asm/paravirt.h>
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#include <asm/ftrace.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_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
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#define __AUDIT_ARCH_64BIT 0x80000000
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#define __AUDIT_ARCH_LE 0x40000000
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.code64
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#ifdef CONFIG_FTRACE
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@ -351,6 +357,7 @@ ENTRY(system_call_after_swapgs)
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GET_THREAD_INFO(%rcx)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%rcx)
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jnz tracesys
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system_call_fastpath:
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cmpq $__NR_syscall_max,%rax
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ja badsys
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movq %r10,%rcx
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@ -402,16 +409,16 @@ sysret_careful:
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sysret_signal:
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_NONE)
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testl $_TIF_DO_NOTIFY_MASK,%edx
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jz 1f
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/* Really a signal */
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#ifdef CONFIG_AUDITSYSCALL
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bt $TIF_SYSCALL_AUDIT,%edx
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jc sysret_audit
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#endif
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/* edx: work flags (arg3) */
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leaq do_notify_resume(%rip),%rax
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leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1
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xorl %esi,%esi # oldset -> arg2
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call ptregscall_common
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1: movl $_TIF_WORK_MASK,%edi
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movl $_TIF_WORK_MASK,%edi
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/* Use IRET because user could have changed frame. This
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works because ptregscall_common has called FIXUP_TOP_OF_STACK. */
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DISABLE_INTERRUPTS(CLBR_NONE)
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@ -422,8 +429,45 @@ badsys:
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movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
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jmp ret_from_sys_call
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#ifdef CONFIG_AUDITSYSCALL
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/*
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* Fast path for syscall audit without full syscall trace.
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* We just call audit_syscall_entry() directly, and then
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* jump back to the normal fast path.
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*/
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auditsys:
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movq %r10,%r9 /* 6th arg: 4th syscall arg */
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movq %rdx,%r8 /* 5th arg: 3rd syscall arg */
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movq %rsi,%rcx /* 4th arg: 2nd syscall arg */
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movq %rdi,%rdx /* 3rd arg: 1st syscall arg */
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movq %rax,%rsi /* 2nd arg: syscall number */
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movl $AUDIT_ARCH_X86_64,%edi /* 1st arg: audit arch */
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call audit_syscall_entry
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LOAD_ARGS 0 /* reload call-clobbered registers */
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jmp system_call_fastpath
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/*
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* Return fast path for syscall audit. Call audit_syscall_exit()
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* directly and then jump back to the fast path with TIF_SYSCALL_AUDIT
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* masked off.
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*/
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sysret_audit:
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movq %rax,%rsi /* second arg, syscall return value */
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cmpq $0,%rax /* is it < 0? */
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setl %al /* 1 if so, 0 if not */
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movzbl %al,%edi /* zero-extend that into %edi */
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inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
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call audit_syscall_exit
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
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jmp sysret_check
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#endif /* CONFIG_AUDITSYSCALL */
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/* Do syscall tracing */
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tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx)
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jz auditsys
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#endif
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SAVE_REST
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movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
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FIXUP_TOP_OF_STACK %rdi
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@ -448,6 +492,7 @@ tracesys:
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* Has correct top of stack, but partial stack frame.
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*/
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.globl int_ret_from_sys_call
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.globl int_with_check
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int_ret_from_sys_call:
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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@ -1476,7 +1476,8 @@ void audit_syscall_entry(int arch, int major,
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struct audit_context *context = tsk->audit_context;
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enum audit_state state;
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BUG_ON(!context);
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if (unlikely(!context))
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return;
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/*
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* This happens only on certain architectures that make system
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