s390/ftrace: verify opcode before applying patch

commit 72b3942a173c ("scripts: ftrace - move the
sort-processing in ftrace_init") had the unexpected
side effect that wrong code locations were patched.
To prevent this from happening again, verify the
opcode before patching it.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 61f72c7fb0da48bd46e64f22d636106b9209437c..1db9cc795034e5318156a5682d25427654f9af7b 100644 (file)
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -164,31 +164,32 @@ int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
        return 0;
 }
 
-static void brcl_disable(void *brcl)
+static int ftrace_patch_branch_mask(void *addr, u16 expected, bool enable)
 {
-       u8 op = 0x04; /* set mask field to zero */
+       u16 old;
+       u8 op;
 
-       s390_kernel_write((char *)brcl + 1, &op, sizeof(op));
+       if (get_kernel_nofault(old, addr))
+               return -EFAULT;
+       if (old != expected)
+               return -EINVAL;
+       /* set mask field to all ones or zeroes */
+       op = enable ? 0xf4 : 0x04;
+       s390_kernel_write((char *)addr + 1, &op, sizeof(op));
+       return 0;
 }
 
 int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
                    unsigned long addr)
 {
-       brcl_disable((void *)rec->ip);
-       return 0;
-}
-
-static void brcl_enable(void *brcl)
-{
-       u8 op = 0xf4; /* set mask field to all ones */
-
-       s390_kernel_write((char *)brcl + 1, &op, sizeof(op));
+       /* Expect brcl 0xf,... */
+       return ftrace_patch_branch_mask((void *)rec->ip, 0xc0f4, false);
 }
 
 int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 {
-       brcl_enable((void *)rec->ip);
-       return 0;
+       /* Expect brcl 0x0,... */
+       return ftrace_patch_branch_mask((void *)rec->ip, 0xc004, true);
 }
 
 int ftrace_update_ftrace_func(ftrace_func_t func)
@@ -261,14 +262,24 @@ NOKPROBE_SYMBOL(prepare_ftrace_return);
  */
 int ftrace_enable_ftrace_graph_caller(void)
 {
-       brcl_disable(ftrace_graph_caller);
+       int rc;
+
+       /* Expect brc 0xf,... */
+       rc = ftrace_patch_branch_mask(ftrace_graph_caller, 0xa7f4, false);
+       if (rc)
+               return rc;
        text_poke_sync_lock();
        return 0;
 }
 
 int ftrace_disable_ftrace_graph_caller(void)
 {
-       brcl_enable(ftrace_graph_caller);
+       int rc;
+
+       /* Expect brc 0x0,... */
+       rc = ftrace_patch_branch_mask(ftrace_graph_caller, 0xa704, true);
+       if (rc)
+               return rc;
        text_poke_sync_lock();
        return 0;
 }