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uprobes/x86: Add uprobe_init_insn(), kill validate_insn_{32,64}bits() 

validate_insn_32bits() and validate_insn_64bits() are very similar,
turn them into the single uprobe_init_insn() which has the additional
"bool x86_64" argument which can be passed to insn_init() and used to
choose between good_insns_64/good_insns_32.

Also kill UPROBE_FIX_NONE, it has no users.

Note: the current code doesn't use ifdef's consistently, good_insns_64
depends on CONFIG_X86_64 but good_insns_32 is unconditional. This patch
removes ifdef around good_insns_64, we will add it back later along with
the similar one for good_insns_32.

Signed-off-by: Oleg Nesterov <oleg@redhat.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 2014-04-19 12:34:02 +02:00
parent 250bbd12c2
commit 73175d0d19
1 changed files with 13 additions and 32 deletions
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45
arch/x86/kernel/uprobes.c
View File

@ -32,9 +32,6 @@
/* Post-execution fixups. */
/* No fixup needed */
#define UPROBE_FIX_NONE 0x0
/* Adjust IP back to vicinity of actual insn */
#define UPROBE_FIX_IP 0x1
@ -114,7 +111,6 @@ static volatile u32 good_2byte_insns[256 / 32] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
};
#ifdef CONFIG_X86_64
/* Good-instruction tables for 64-bit apps */
static volatile u32 good_insns_64[256 / 32] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
@ -138,7 +134,6 @@ static volatile u32 good_insns_64[256 / 32] = {
/* ---------------------------------------------- */
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
};
#endif
#undef W
/*
@ -209,16 +204,22 @@ static bool is_prefix_bad(struct insn *insn)
return false;
}
static int validate_insn_32bits(struct arch_uprobe *auprobe, struct insn *insn)
static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool x86_64)
{
insn_init(insn, auprobe->insn, false);
u32 volatile *good_insns;
insn_init(insn, auprobe->insn, x86_64);
/* Skip good instruction prefixes; reject "bad" ones. */
insn_get_opcode(insn);
if (is_prefix_bad(insn))
return -ENOTSUPP;
if (test_bit(OPCODE1(insn), (unsigned long *)good_insns_32))
if (x86_64)
good_insns = good_insns_64;
else
good_insns = good_insns_32;
if (test_bit(OPCODE1(insn), (unsigned long *)good_insns))
return 0;
if (insn->opcode.nbytes == 2) {
@ -355,30 +356,10 @@ handle_riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs, long *
}
}
static int validate_insn_64bits(struct arch_uprobe *auprobe, struct insn *insn)
{
insn_init(insn, auprobe->insn, true);
/* Skip good instruction prefixes; reject "bad" ones. */
insn_get_opcode(insn);
if (is_prefix_bad(insn))
return -ENOTSUPP;
if (test_bit(OPCODE1(insn), (unsigned long *)good_insns_64))
return 0;
if (insn->opcode.nbytes == 2) {
if (test_bit(OPCODE2(insn), (unsigned long *)good_2byte_insns))
return 0;
}
return -ENOTSUPP;
}
static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
{
if (mm->context.ia32_compat)
return validate_insn_32bits(auprobe, insn);
return validate_insn_64bits(auprobe, insn);
bool x86_64 = !mm->context.ia32_compat;
return uprobe_init_insn(auprobe, insn, x86_64);
}
#else /* 32-bit: */
/*
@ -398,7 +379,7 @@ static void handle_riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *
static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
{
return validate_insn_32bits(auprobe, insn);
return uprobe_init_insn(auprobe, insn, false);
}
#endif /* CONFIG_X86_64 */