On Wed, 25 Jan 2017 12:23:47 -0800 Ricardo Neri <[email protected]> wrote:
> The function insn_get_reg_offset requires a type to indicate whether > the returned offset is that given by by the ModRM or the SIB byte. > Callers of this function would need the definition of the type struct. > This is not needed. Instead, auxiliary functions can be defined for > this purpose. > > When the operand is a register, the emulation code for User-Mode > Instruction Prevention needs to know the offset of the register indicated > in the r/m part of the ModRM byte. Thus, start by adding an auxiliary > function for this purpose. Hmm, why wouldn't you just rename it to insn_get_reg_offset() and export it? Thank you, > > Cc: Dave Hansen <[email protected]> > Cc: Adam Buchbinder <[email protected]> > Cc: Colin Ian King <[email protected]> > Cc: Lorenzo Stoakes <[email protected]> > Cc: Qiaowei Ren <[email protected]> > Cc: Arnaldo Carvalho de Melo <[email protected]> > Cc: Masami Hiramatsu <[email protected]> > Cc: Adrian Hunter <[email protected]> > Cc: Kees Cook <[email protected]> > Cc: Thomas Garnier <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Dmitry Vyukov <[email protected]> > Cc: Ravi V. Shankar <[email protected]> > Cc: [email protected] > Signed-off-by: Ricardo Neri <[email protected]> > --- > arch/x86/include/asm/insn-kernel.h | 1 + > arch/x86/lib/insn-kernel.c | 5 +++++ > 2 files changed, 6 insertions(+) > > diff --git a/arch/x86/include/asm/insn-kernel.h > b/arch/x86/include/asm/insn-kernel.h > index aef416a..3f34649 100644 > --- a/arch/x86/include/asm/insn-kernel.h > +++ b/arch/x86/include/asm/insn-kernel.h > @@ -12,5 +12,6 @@ > #include <asm/ptrace.h> > > void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs); > +int insn_get_reg_offset_rm(struct insn *insn, struct pt_regs *regs); > > #endif /* _ASM_X86_INSN_KERNEL_H */ > diff --git a/arch/x86/lib/insn-kernel.c b/arch/x86/lib/insn-kernel.c > index 8072abe..267cab4 100644 > --- a/arch/x86/lib/insn-kernel.c > +++ b/arch/x86/lib/insn-kernel.c > @@ -95,6 +95,11 @@ static int get_reg_offset(struct insn *insn, struct > pt_regs *regs, > return regoff[regno]; > } > > +int insn_get_reg_offset_rm(struct insn *insn, struct pt_regs *regs) > +{ > + return get_reg_offset(insn, regs, REG_TYPE_RM); > +} > + > /* > * return the address being referenced be instruction > * for rm=3 returning the content of the rm reg > -- > 2.9.3 > -- Masami Hiramatsu <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
