linux-kernel - [tip:core/urgent] fs/proc: Report eip/esp in /prod/PID/stat for coredumping

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Message-ID: <tip-451eb3f2053ea4eeb40f94947c542cfbd7636186@git.kernel.org>
Date:   Fri, 15 Sep 2017 14:09:47 -0700
From:   tip-bot for John Ogness <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, tycho.andersen@...onical.com, bp@...en8.de,
        mingo@...nel.org, torvalds@...ux-foundation.org, hpa@...or.com,
        viro@...iv.linux.org.uk, marco.felsch@...h.de,
        linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp,
        peterz@...radead.org, brgerst@...il.com, akpm@...ux-foundation.org,
        linux-api@...r.kernel.org, tglx@...utronix.de,
        keescook@...omium.org, john.ogness@...utronix.de
Subject: [tip:core/urgent] fs/proc: Report eip/esp in /prod/PID/stat for
 coredumping

Commit-ID:  451eb3f2053ea4eeb40f94947c542cfbd7636186
Gitweb:     http://git.kernel.org/tip/451eb3f2053ea4eeb40f94947c542cfbd7636186
Author:     John Ogness <john.ogness@...utronix.de>
AuthorDate: Thu, 14 Sep 2017 11:42:17 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 15 Sep 2017 23:04:59 +0200

fs/proc: Report eip/esp in /prod/PID/stat for coredumping

Commit 0a1eb2d474ed ("fs/proc: Stop reporting eip and esp in
/proc/PID/stat") stopped reporting eip/esp because it is
racey and dangerous for executing tasks. The comment adds:

    As far as I know, there are no use programs that make any
    material use of these fields, so just get rid of them.

However, existing userspace core-dump-handler applications (for
example, minicoredumper) are using these fields since they
provide an excellent cross-platform interface to these valuable
pointers. So that commit introduced a user space visible
regression.

Partially revert the change and make the readout possible for
tasks with the proper permissions and only if the target task
has the PF_DUMPCORE flag set.

Fixes: 0a1eb2d474ed ("fs/proc: Stop reporting eip and esp in> /proc/PID/stat")
Reported-by: Marco Felsch <marco.felsch@...h.de>
Signed-off-by: John Ogness <john.ogness@...utronix.de>
Reviewed-by: Andy Lutomirski <luto@...nel.org>
Cc: Tycho Andersen <tycho.andersen@...onical.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: stable@...r.kernel.org
Cc: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Linux API <linux-api@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/87poatfwg6.fsf@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 fs/proc/array.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 88c3555..696cc68 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -421,7 +421,15 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 		 * esp and eip are intentionally zeroed out.  There is no
 		 * non-racy way to read them without freezing the task.
 		 * Programs that need reliable values can use ptrace(2).
+		 *
+		 * The only exception is if the task is core dumping because
+		 * a program is not able to use ptrace(2) in that case. It is
+		 * safe because the task has stopped executing permanently.
 		 */
+		if (permitted && (task->flags & PF_DUMPCORE)) {
+			eip = KSTK_EIP(task);
+			esp = KSTK_ESP(task);
+		}
 	}
 
 	get_task_comm(tcomm, task);