linux-kernel - [PATCH 4.4 105/159] kprobes/x86: Prohibit probing on exception masking instructions

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Message-Id: <20191122100823.611923386@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:28:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Francis Deslauriers <francis.deslauriers@...icios.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, Yonghong Song <yhs@...com>,
        Borislav Petkov <bp@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 105/159] kprobes/x86: Prohibit probing on exception masking instructions

From: Masami Hiramatsu <mhiramat@...nel.org>

commit ee6a7354a3629f9b65bc18dbe393503e9440d6f5 upstream.

Since MOV SS and POP SS instructions will delay the exceptions until the
next instruction is executed, single-stepping on it by kprobes must be
prohibited.

However, kprobes usually executes those instructions directly on trampoline
buffer (a.k.a. kprobe-booster), except for the kprobes which has
post_handler. Thus if kprobe user probes MOV SS with post_handler, it will
do single-stepping on the MOV SS.

This means it is safe that if it is used via ftrace or perf/bpf since those
don't use the post_handler.

Anyway, since the stack switching is a rare case, it is safer just
rejecting kprobes on such instructions.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc: Francis Deslauriers <francis.deslauriers@...icios.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: "H . Peter Anvin" <hpa@...or.com>
Cc: Yonghong Song <yhs@...com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "David S . Miller" <davem@...emloft.net>
Link: https://lkml.kernel.org/r/152587069574.17316.3311695234863248641.stgit@devbox
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/insn.h    |   18 ++++++++++++++++++
 arch/x86/kernel/kprobes/core.c |    4 ++++
 2 files changed, 22 insertions(+)

--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -198,4 +198,22 @@ static inline int insn_offset_immediate(
 	return insn_offset_displacement(insn) + insn->displacement.nbytes;
 }

+#define POP_SS_OPCODE 0x1f
+#define MOV_SREG_OPCODE 0x8e
+
+/*
+ * Intel SDM Vol.3A 6.8.3 states;
+ * "Any single-step trap that would be delivered following the MOV to SS
+ * instruction or POP to SS instruction (because EFLAGS.TF is 1) is
+ * suppressed."
+ * This function returns true if @insn is MOV SS or POP SS. On these
+ * instructions, single stepping is suppressed.
+ */
+static inline int insn_masking_exception(struct insn *insn)
+{
+	return insn->opcode.bytes[0] == POP_SS_OPCODE ||
+		(insn->opcode.bytes[0] == MOV_SREG_OPCODE &&
+		 X86_MODRM_REG(insn->modrm.bytes[0]) == 2);
+}
+
 #endif /* _ASM_X86_INSN_H */
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -372,6 +372,10 @@ int __copy_instruction(u8 *dest, u8 *src
 		return 0;
 	memcpy(dest, insn.kaddr, length);

+	/* We should not singlestep on the exception masking instructions */
+	if (insn_masking_exception(&insn))
+		return 0;
+
 #ifdef CONFIG_X86_64
 	if (insn_rip_relative(&insn)) {
 		s64 newdisp;