MIPS: Prevent unaligned accesses during stack unwinding

During stack unwinding we call a number of functions to determine what
type of instruction we're looking at. The union mips_instruction pointer
provided to them may be pointing at a 2 byte, but not 4 byte, aligned
address & we thus cannot directly access the 4 byte wide members of the
union mips_instruction. To avoid this is_ra_save_ins() copies the
required half-words of the microMIPS instruction to a correctly aligned
union mips_instruction on the stack, which it can then access safely.
The is_jump_ins() & is_sp_move_ins() functions do not correctly perform
this temporary copy, and instead attempt to directly dereference 4 byte
fields which may be misaligned and lead to an address exception.

Fix this by copying the instruction halfwords to a temporary union
mips_instruction in get_frame_info() such that we can provide a 4 byte
aligned union mips_instruction to the is_*_ins() functions and they do
not need to deal with misalignment themselves.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 34c2f668d0f6 ("MIPS: microMIPS: Add unaligned access support.")
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # v3.10+
Patchwork: https://patchwork.linux-mips.org/patch/14529/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 213278d..8dddaef 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -199,8 +199,6 @@ struct mips_frame_info {
 static inline int is_ra_save_ins(union mips_instruction *ip)
 {
 #ifdef CONFIG_CPU_MICROMIPS
-       union mips_instruction mmi;
-
        /*
         * swsp ra,offset
         * swm16 reglist,offset(sp)
@@ -210,23 +208,20 @@ static inline int is_ra_save_ins(union mips_instruction *ip)
         *
         * microMIPS is way more fun...
         */
-       if (mm_insn_16bit(ip->halfword[0])) {
-               mmi.word = (ip->halfword[0] << 16);
-               return (mmi.mm16_r5_format.opcode == mm_swsp16_op &&
-                       mmi.mm16_r5_format.rt == 31) ||
-                      (mmi.mm16_m_format.opcode == mm_pool16c_op &&
-                       mmi.mm16_m_format.func == mm_swm16_op);
+       if (mm_insn_16bit(ip->halfword[1])) {
+               return (ip->mm16_r5_format.opcode == mm_swsp16_op &&
+                       ip->mm16_r5_format.rt == 31) ||
+                      (ip->mm16_m_format.opcode == mm_pool16c_op &&
+                       ip->mm16_m_format.func == mm_swm16_op);
        }
        else {
-               mmi.halfword[0] = ip->halfword[1];
-               mmi.halfword[1] = ip->halfword[0];
-               return (mmi.mm_m_format.opcode == mm_pool32b_op &&
-                       mmi.mm_m_format.rd > 9 &&
-                       mmi.mm_m_format.base == 29 &&
-                       mmi.mm_m_format.func == mm_swm32_func) ||
-                      (mmi.i_format.opcode == mm_sw32_op &&
-                       mmi.i_format.rs == 29 &&
-                       mmi.i_format.rt == 31);
+               return (ip->mm_m_format.opcode == mm_pool32b_op &&
+                       ip->mm_m_format.rd > 9 &&
+                       ip->mm_m_format.base == 29 &&
+                       ip->mm_m_format.func == mm_swm32_func) ||
+                      (ip->i_format.opcode == mm_sw32_op &&
+                       ip->i_format.rs == 29 &&
+                       ip->i_format.rt == 31);
        }
 #else
        /* sw / sd $ra, offset($sp) */
@@ -247,12 +242,8 @@ static inline int is_jump_ins(union mips_instruction *ip)
         *
         * microMIPS is kind of more fun...
         */
-       union mips_instruction mmi;
-
-       mmi.word = (ip->halfword[0] << 16);
-
-       if ((mmi.mm16_r5_format.opcode == mm_pool16c_op &&
-           (mmi.mm16_r5_format.rt & mm_jr16_op) == mm_jr16_op) ||
+       if ((ip->mm16_r5_format.opcode == mm_pool16c_op &&
+           (ip->mm16_r5_format.rt & mm_jr16_op) == mm_jr16_op) ||
            ip->j_format.opcode == mm_jal32_op)
                return 1;
        if (ip->r_format.opcode != mm_pool32a_op ||
@@ -281,15 +272,13 @@ static inline int is_sp_move_ins(union mips_instruction *ip)
         *
         * microMIPS is not more fun...
         */
-       if (mm_insn_16bit(ip->halfword[0])) {
-               union mips_instruction mmi;
-
-               mmi.word = (ip->halfword[0] << 16);
-               return (mmi.mm16_r3_format.opcode == mm_pool16d_op &&
-                       mmi.mm16_r3_format.simmediate && mm_addiusp_func) ||
-                      (mmi.mm16_r5_format.opcode == mm_pool16d_op &&
-                       mmi.mm16_r5_format.rt == 29);
+       if (mm_insn_16bit(ip->halfword[1])) {
+               return (ip->mm16_r3_format.opcode == mm_pool16d_op &&
+                       ip->mm16_r3_format.simmediate && mm_addiusp_func) ||
+                      (ip->mm16_r5_format.opcode == mm_pool16d_op &&
+                       ip->mm16_r5_format.rt == 29);
        }
+
        return ip->mm_i_format.opcode == mm_addiu32_op &&
               ip->mm_i_format.rt == 29 && ip->mm_i_format.rs == 29;
 #else
@@ -304,7 +293,8 @@ static inline int is_sp_move_ins(union mips_instruction *ip)
 
 static int get_frame_info(struct mips_frame_info *info)
 {
-       union mips_instruction *ip;
+       bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS);
+       union mips_instruction insn, *ip;
        unsigned max_insns = info->func_size / sizeof(union mips_instruction);
        unsigned i;
 
@@ -320,11 +310,21 @@ static int get_frame_info(struct mips_frame_info *info)
        max_insns = min(128U, max_insns);
 
        for (i = 0; i < max_insns; i++, ip++) {
+               if (is_mmips && mm_insn_16bit(ip->halfword[0])) {
+                       insn.halfword[0] = 0;
+                       insn.halfword[1] = ip->halfword[0];
+               } else if (is_mmips) {
+                       insn.halfword[0] = ip->halfword[1];
+                       insn.halfword[1] = ip->halfword[0];
+               } else {
+                       insn.word = ip->word;
+               }
 
-               if (is_jump_ins(ip))
+               if (is_jump_ins(&insn))
                        break;
+
                if (!info->frame_size) {
-                       if (is_sp_move_ins(ip))
+                       if (is_sp_move_ins(&insn))
                        {
 #ifdef CONFIG_CPU_MICROMIPS
                                if (mm_insn_16bit(ip->halfword[0]))
@@ -347,7 +347,7 @@ static int get_frame_info(struct mips_frame_info *info)
                        }
                        continue;
                }
-               if (info->pc_offset == -1 && is_ra_save_ins(ip)) {
+               if (info->pc_offset == -1 && is_ra_save_ins(&insn)) {
                        info->pc_offset =
                                ip->i_format.simmediate / sizeof(long);
                        break;