powerpc/spufs: Rework fcheck() usage

Currently the spu coredump code triggers an RCU warning:

  =============================
  WARNING: suspicious RCU usage
  5.7.0-rc3-01755-g7cd49f0b7ec7 #1 Not tainted
  -----------------------------
  include/linux/fdtable.h:95 suspicious rcu_dereference_check() usage!

  other info that might help us debug this:

  rcu_scheduler_active = 2, debug_locks = 1
  1 lock held by spu-coredump/1343:
   #0: c0000007fa22f430 (sb_writers#2){.+.+}-{0:0}, at: .do_coredump+0x1010/0x13c8

  stack backtrace:
  CPU: 0 PID: 1343 Comm: spu-coredump Not tainted 5.7.0-rc3-01755-g7cd49f0b7ec7 #1
  Call Trace:
    .dump_stack+0xec/0x15c (unreliable)
    .lockdep_rcu_suspicious+0x120/0x144
    .coredump_next_context+0x148/0x158
    .spufs_coredump_extra_notes_size+0x54/0x190
    .elf_coredump_extra_notes_size+0x34/0x50
    .elf_core_dump+0xe48/0x19d0
    .do_coredump+0xe50/0x13c8
    .get_signal+0x864/0xd88
    .do_notify_resume+0x158/0x3c8
    .interrupt_exit_user_prepare+0x19c/0x208
    interrupt_return+0x14/0x1c0

This comes from fcheck_files() via fcheck().

It's pretty clearly documented that fcheck() must be wrapped with
rcu_read_lock(), adding that fixes the RCU warning.

hch points out that once we've released the RCU read lock the file may
be closed and freed, which would leave us with a pointer to a freed
spu_context.

To avoid that, take a reference to the spu_context while we hold the
RCU read lock, and drop that reference later once we're done with the
context.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200508130633.2532759-1-mpe@ellerman.id.au

diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c
index 3b75e8f..40dd7b4 100644 (file)
--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -66,13 +66,20 @@ static int match_context(const void *v, struct file *file, unsigned fd)
  */
 static struct spu_context *coredump_next_context(int *fd)
 {
+       struct spu_context *ctx;
        struct file *file;
        int n = iterate_fd(current->files, *fd, match_context, NULL);
        if (!n)
                return NULL;
        *fd = n - 1;
+
+       rcu_read_lock();
        file = fcheck(*fd);
-       return SPUFS_I(file_inode(file))->i_ctx;
+       ctx = SPUFS_I(file_inode(file))->i_ctx;
+       get_spu_context(ctx);
+       rcu_read_unlock();
+
+       return ctx;
 }
 
 int spufs_coredump_extra_notes_size(void)
@@ -83,17 +90,23 @@ int spufs_coredump_extra_notes_size(void)
        fd = 0;
        while ((ctx = coredump_next_context(&fd)) != NULL) {
                rc = spu_acquire_saved(ctx);
-               if (rc)
+               if (rc) {
+                       put_spu_context(ctx);
                        break;
+               }
+
                rc = spufs_ctx_note_size(ctx, fd);
                spu_release_saved(ctx);
-               if (rc < 0)
+               if (rc < 0) {
+                       put_spu_context(ctx);
                        break;
+               }
 
                size += rc;
 
                /* start searching the next fd next time */
                fd++;
+               put_spu_context(ctx);
        }
 
        return size;