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uprobes/x86: Kill the "ia32_compat" check in handle_riprel_insn(), remove "mm" arg

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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 <oleg@redhat.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Jim Keniston <jkenisto@us.ibm.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2014-03-31 18:09:36 +02:00
parent ddb69f276c
commit 59078d4b96
1 changed files with 3 additions and 7 deletions
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10
arch/x86/kernel/uprobes.c
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@ -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 */