Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1380914 > unrolled thread

[PATCH 3.14 03/37] parisc: Fix kernel crash with reversed copy_from_user()

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  [PATCH 3.14 03/37] parisc: Fix kernel crash with reversed copy_from_user() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-04-18 04:30 +0200

#1380914 — [PATCH 3.14 03/37] parisc: Fix kernel crash with reversed copy_from_user()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Helge Deller <deller@gmx.de>

commit ef72f3110d8b19f4c098a0bff7ed7d11945e70c6 upstream.

The kernel module testcase (lib/test_user_copy.c) exhibited a kernel
crash on parisc if the parameters for copy_from_user were reversed
("illegal reversed copy_to_user" testcase).

Fix this potential crash by checking the fault handler if the faulting
address is in the exception table.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/kernel/traps.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -802,6 +802,9 @@ void notrace handle_interruption(int cod
 
 	    if (fault_space == 0 && !in_atomic())
 	    {
+		/* Clean up and return if in exception table. */
+		if (fixup_exception(regs))
+			return;
 		pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
 		parisc_terminate("Kernel Fault", regs, code, fault_address);
 	    }

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web