coredump: fix wrong comments on core limits of pipe coredump case

In commit 898b374af6f7 ("exec: replace call_usermodehelper_pipe with use
of umh init function and resolve limit"), the core limits recursive
check value was changed from 0 to 1, but the corresponding comments were
not updated.

Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 5af8390e0fae..3684353ebd5f 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -2174,15 +2174,16 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
                 }
 
                 if (cprm.limit == 1) {
-                        /*
+                        /* See umh_pipe_setup() which sets RLIMIT_CORE = 1.
+                         *
                          * Normally core limits are irrelevant to pipes, since
                          * we're not writing to the file system, but we use
-                         * cprm.limit of 1 here as a speacial value. Any
-                         * non-1 limit gets set to RLIM_INFINITY below, but
-                         * a limit of 0 skips the dump.  This is a consistent
-                         * way to catch recursive crashes.  We can still crash
-                         * if the core_pattern binary sets RLIM_CORE =  !1
-                         * but it runs as root, and can do lots of stupid things
+                         * cprm.limit of 1 here as a speacial value, this is a
+                         * consistent way to catch recursive crashes.
+                         * We can still crash if the core_pattern binary sets
+                         * RLIM_CORE = !1, but it runs as root, and can do
+                         * lots of stupid things.
+                         *
                          * Note that we use task_tgid_vnr here to grab the pid
                          * of the process group leader.  That way we get the
                          * right pid if a thread in a multi-threaded