uprobes: Shift ->readpage check from __copy_insn() to uprobe_register()

copy_insn() fails with -EIO if ->readpage == NULL, but this error
is not propagated unless uprobe_register() path finds ->mm which
already mmaps this file. In this case (say) "perf record" does not
actually install the probe, but the user can't know about this.

Move this check into uprobe_register() so that this problem can be
detected earlier and reported to user.

Note: this is still not perfect,

	- copy_insn() and arch_uprobe_analyze_insn() should be called
	  by uprobe_register() but this is not simple, we need vm_file
	  for read_mapping_page() (although perhaps we can pass NULL),
	  and we need ->mm for is_64bit_mm() (although this logic is
	  broken anyway).

	- uprobe_register() should be called by create_trace_uprobe(),
	  not by probe_event_enable(), so that an error can be detected
	  at "perf probe -x" time. This also needs more changes in the
	  core uprobe code, uprobe register/unregister interface was
	  poorly designed from the very beginning.

Reported-by: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 3b02c72938a8..c56b13e3b5e1 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -536,9 +536,6 @@ static int __copy_insn(struct address_space *mapping, struct file *filp,
                         void *insn, int nbytes, loff_t offset)
 {
         struct page *page;
-
-        if (!mapping->a_ops->readpage)
-                return -EIO;
         /*
          * Ensure that the page that has the original instruction is
          * populated and in page-cache.
@@ -879,6 +876,9 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
         if (!uc->handler && !uc->ret_handler)
                 return -EINVAL;
 
+        /* copy_insn()->read_mapping_page() needs ->readpage() */
+        if (!inode->i_mapping->a_ops->readpage)
+                return -EIO;
         /* Racy, just to catch the obvious mistakes */
         if (offset > i_size_read(inode))
                 return -EINVAL;