exec: fix use-after-free bug in setup_new_exec()

Setting the task name is done within setup_new_exec() by accessing
bprm->filename. However this happens after flush_old_exec().
This may result in a use after free bug, flush_old_exec() may
"complete" vfork_done, which will wake up the parent which in turn
may free the passed in filename.
To fix this add a new tcomm field in struct linux_binprm which
contains the now early generated task name until it is used.

Fixes this bug on s390:

  Unable to handle kernel pointer dereference at virtual kernel address 0000000039768000
  Process kworker/u:3 (pid: 245, task: 000000003a3dc840, ksp: 0000000039453818)
  Krnl PSW : 0704000180000000 0000000000282e94 (setup_new_exec+0xa0/0x374)
  Call Trace:
  ([<0000000000282e2c>] setup_new_exec+0x38/0x374)
   [<00000000002dd12e>] load_elf_binary+0x402/0x1bf4
   [<0000000000280a42>] search_binary_handler+0x38e/0x5bc
   [<0000000000282b6c>] do_execve_common+0x410/0x514
   [<0000000000282cb6>] do_execve+0x46/0x58
   [<00000000005bce58>] kernel_execve+0x28/0x70
   [<000000000014ba2e>] ____call_usermodehelper+0x102/0x140
   [<00000000005bc8da>] kernel_thread_starter+0x6/0xc
   [<00000000005bc8d4>] kernel_thread_starter+0x0/0xc
  Last Breaking-Event-Address:
   [<00000000002830f0>] setup_new_exec+0x2fc/0x374

  Kernel panic - not syncing: Fatal exception: panic_on_oops

Reported-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 16 deletions

diff --git a/fs/exec.c b/fs/exec.c
index aeb135c7ff5c..92ce83a11e90 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1071,6 +1071,21 @@ void set_task_comm(struct task_struct *tsk, char *buf)
         perf_event_comm(tsk);
 }
 
+static void filename_to_taskname(char *tcomm, const char *fn, unsigned int len)
+{
+        int i, ch;
+
+        /* Copies the binary name from after last slash */
+        for (i = 0; (ch = *(fn++)) != '\0';) {
+                if (ch == '/')
+                        i = 0; /* overwrite what we wrote */
+                else
+                        if (i < len - 1)
+                                tcomm[i++] = ch;
+        }
+        tcomm[i] = '\0';
+}
+
 int flush_old_exec(struct linux_binprm * bprm)
 {
         int retval;
@@ -1085,6 +1100,7 @@ int flush_old_exec(struct linux_binprm * bprm)
 
         set_mm_exe_file(bprm->mm, bprm->file);
 
+        filename_to_taskname(bprm->tcomm, bprm->filename, sizeof(bprm->tcomm));
         /*
          * Release all of the old mmap stuff
          */
@@ -1116,10 +1132,6 @@ EXPORT_SYMBOL(would_dump);
 
 void setup_new_exec(struct linux_binprm * bprm)
 {
-        int i, ch;
-        const char *name;
-        char tcomm[sizeof(current->comm)];
-
         arch_pick_mmap_layout(current->mm);
 
         /* This is the point of no return */
@@ -1130,18 +1142,7 @@ void setup_new_exec(struct linux_binprm * bprm)
         else
                 set_dumpable(current->mm, suid_dumpable);
 
-        name = bprm->filename;
-
-        /* Copies the binary name from after last slash */
-        for (i=0; (ch = *(name++)) != '\0';) {
-                if (ch == '/')
-                        i = 0; /* overwrite what we wrote */
-                else
-                        if (i < (sizeof(tcomm) - 1))
-                                tcomm[i++] = ch;
-        }
-        tcomm[i] = '\0';
-        set_task_comm(current, tcomm);
+        set_task_comm(current, bprm->tcomm);
 
         /* Set the new mm task size. We have to do that late because it may
          * depend on TIF_32BIT which is only updated in flush_thread() on