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The audit system previously expected arches calling to audit_syscall_exit to supply as arguments if the syscall was a success and what the return code was. Audit also provides a helper AUDITSC_RESULT which was supposed to simplify things by converting from negative retcodes to an audit internal magic value stating success or failure. This helper was wrong and could indicate that a valid pointer returned to userspace was a failed syscall. The fix is to fix the layering foolishness. We now pass audit_syscall_exit a struct pt_reg and it in turns calls back into arch code to collect the return value and to determine if the syscall was a success or failure. We also define a generic is_syscall_success() macro which determines success/failure based on if the value is < -MAX_ERRNO. This works for arches like x86 which do not use a separate mechanism to indicate syscall failure. We make both the is_syscall_success() and regs_return_value() static inlines instead of macros. The reason is because the audit function must take a void* for the regs. (uml calls theirs struct uml_pt_regs instead of just struct pt_regs so audit_syscall_exit can't take a struct pt_regs). Since the audit function takes a void* we need to use static inlines to cast it back to the arch correct structure to dereference it. The other major change is that on some arches, like ia64, MIPS and ppc, we change regs_return_value() to give us the negative value on syscall failure. THE only other user of this macro, kretprobe_example.c, won't notice and it makes the value signed consistently for the audit functions across all archs. In arch/sh/kernel/ptrace_64.c I see that we were using regs[9] in the old audit code as the return value. But the ptrace_64.h code defined the macro regs_return_value() as regs[3]. I have no idea which one is correct, but this patch now uses the regs_return_value() function, so it now uses regs[3]. For powerpc we previously used regs->result but now use the regs_return_value() function which uses regs->gprs[3]. regs->gprs[3] is always positive so the regs_return_value(), much like ia64 makes it negative before calling the audit code when appropriate. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: H. Peter Anvin <hpa@zytor.com> [for x86 portion] Acked-by: Tony Luck <tony.luck@intel.com> [for ia64] Acked-by: Richard Weinberger <richard@nod.at> [for uml] Acked-by: David S. Miller <davem@davemloft.net> [for sparc] Acked-by: Ralf Baechle <ralf@linux-mips.org> [for mips] Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [for ppc]
84 lines
2 KiB
C
84 lines
2 KiB
C
/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_PTRACE_H
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#define _ASM_MICROBLAZE_PTRACE_H
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#ifndef __ASSEMBLY__
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typedef unsigned long microblaze_reg_t;
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struct pt_regs {
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microblaze_reg_t r0;
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microblaze_reg_t r1;
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microblaze_reg_t r2;
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microblaze_reg_t r3;
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microblaze_reg_t r4;
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microblaze_reg_t r5;
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microblaze_reg_t r6;
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microblaze_reg_t r7;
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microblaze_reg_t r8;
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microblaze_reg_t r9;
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microblaze_reg_t r10;
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microblaze_reg_t r11;
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microblaze_reg_t r12;
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microblaze_reg_t r13;
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microblaze_reg_t r14;
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microblaze_reg_t r15;
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microblaze_reg_t r16;
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microblaze_reg_t r17;
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microblaze_reg_t r18;
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microblaze_reg_t r19;
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microblaze_reg_t r20;
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microblaze_reg_t r21;
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microblaze_reg_t r22;
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microblaze_reg_t r23;
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microblaze_reg_t r24;
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microblaze_reg_t r25;
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microblaze_reg_t r26;
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microblaze_reg_t r27;
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microblaze_reg_t r28;
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microblaze_reg_t r29;
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microblaze_reg_t r30;
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microblaze_reg_t r31;
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microblaze_reg_t pc;
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microblaze_reg_t msr;
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microblaze_reg_t ear;
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microblaze_reg_t esr;
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microblaze_reg_t fsr;
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int pt_mode;
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};
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#ifdef __KERNEL__
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#define kernel_mode(regs) ((regs)->pt_mode)
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#define user_mode(regs) (!kernel_mode(regs))
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return regs->r3;
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}
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#else /* __KERNEL__ */
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/* pt_regs offsets used by gdbserver etc in ptrace syscalls */
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#define PT_GPR(n) ((n) * sizeof(microblaze_reg_t))
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#define PT_PC (32 * sizeof(microblaze_reg_t))
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#define PT_MSR (33 * sizeof(microblaze_reg_t))
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#define PT_EAR (34 * sizeof(microblaze_reg_t))
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#define PT_ESR (35 * sizeof(microblaze_reg_t))
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#define PT_FSR (36 * sizeof(microblaze_reg_t))
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#define PT_KERNEL_MODE (37 * sizeof(microblaze_reg_t))
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#endif /* __KERNEL */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_PTRACE_H */
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