From 59078d4b96bb548f97d9fb429b929a289e4884d9 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Mon, 31 Mar 2014 18:09:36 +0200 Subject: [PATCH] uprobes/x86: Kill the "ia32_compat" check in handle_riprel_insn(), remove "mm" arg Kill the "mm->context.ia32_compat" check in handle_riprel_insn(), if it is true insn_rip_relative() must return false. validate_insn_bits() passed "ia32_compat" as !x86_64 to insn_init(), and insn_rip_relative() checks insn->x86_64. Also, remove the no longer needed "struct mm_struct *mm" argument and the unnecessary "return" at the end. Signed-off-by: Oleg Nesterov Reviewed-by: Masami Hiramatsu Reviewed-by: Jim Keniston Acked-by: Srikar Dronamraju --- arch/x86/kernel/uprobes.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index 098e56ec7954..963c121c0307 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -253,14 +253,11 @@ static int validate_insn_32bits(struct arch_uprobe *auprobe, struct insn *insn) * - The displacement is always 4 bytes. */ static void -handle_riprel_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn) +handle_riprel_insn(struct arch_uprobe *auprobe, struct insn *insn) { u8 *cursor; u8 reg; - if (mm->context.ia32_compat) - return; - if (!insn_rip_relative(insn)) return; @@ -314,7 +311,6 @@ handle_riprel_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, struct ins cursor++; memmove(cursor, cursor + insn->displacement.nbytes, insn->immediate.nbytes); } - return; } static int validate_insn_64bits(struct arch_uprobe *auprobe, struct insn *insn) @@ -343,7 +339,7 @@ static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, return validate_insn_64bits(auprobe, insn); } #else /* 32-bit: */ -static void handle_riprel_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn) +static void handle_riprel_insn(struct arch_uprobe *auprobe, struct insn *insn) { /* No RIP-relative addressing on 32-bit */ } @@ -376,7 +372,7 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, * and annotate arch_uprobe->fixups accordingly. To start with, ->fixups * is either zero or it reflects rip-related fixups. */ - handle_riprel_insn(auprobe, mm, &insn); + handle_riprel_insn(auprobe, &insn); switch (OPCODE1(&insn)) { case 0x9d: /* popf */ -- 2.20.1