Commit-ID: 2ae1f49ae1978fedb6ad607e1f8b084aa9752f95
Gitweb: http://git.kernel.org/tip/2ae1f49ae1978fedb6ad607e1f8b084aa9752f95
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Sat, 19 Apr 2014 14:03:05 +0200
Committer: Oleg Nesterov <oleg@xxxxxxxxxx>
CommitDate: Wed, 30 Apr 2014 19:10:33 +0200
uprobes/x86: Add is_64bit_mm(), kill validate_insn_bits()
1. Extract the ->ia32_compat check from 64bit validate_insn_bits()
into the new helper, is_64bit_mm(), it will have more users.
TODO: this checks is actually wrong if mm owner is X32 task,
we need another fix which changes set_personality_ia32().
TODO: even worse, the whole 64-or-32-bit logic is very broken
and the fix is not simple, we need the nontrivial changes in
the core uprobes code.
2. Kill validate_insn_bits() and change its single caller to use
uprobe_init_insn(is_64bit_mm(mm).
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Reviewed-by: Jim Keniston <jkenisto@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/uprobes.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index b4aff6a..b3b25dd 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -231,6 +231,11 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool
}
#ifdef CONFIG_X86_64
+static inline bool is_64bit_mm(struct mm_struct *mm)
+{
+ return !config_enabled(CONFIG_IA32_EMULATION) ||
+ !mm->context.ia32_compat;
+}
/*
* If arch_uprobe->insn doesn't use rip-relative addressing, return
* immediately. Otherwise, rewrite the instruction so that it accesses
@@ -355,13 +360,11 @@ handle_riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs, long *
*correction += 4;
}
}
-
-static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
+#else /* 32-bit: */
+static inline bool is_64bit_mm(struct mm_struct *mm)
{
- bool x86_64 = !mm->context.ia32_compat;
- return uprobe_init_insn(auprobe, insn, x86_64);
+ return false;
}
-#else /* 32-bit: */
/*
* No RIP-relative addressing on 32-bit
*/
@@ -376,11 +379,6 @@ static void handle_riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *
long *correction)
{
}
-
-static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm, struct insn *insn)
-{
- return uprobe_init_insn(auprobe, insn, false);
-}
#endif /* CONFIG_X86_64 */
struct uprobe_xol_ops {
@@ -625,7 +623,7 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
bool fix_ip = true, fix_call = false;
int ret;
- ret = validate_insn_bits(auprobe, mm, &insn);
+ ret = uprobe_init_insn(auprobe, &insn, is_64bit_mm(mm));
if (ret)
return ret;
--
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