Commit 10da5278 authored by James Hogan's avatar James Hogan Committed by Luis Henriques

MIPS: uaccess: Fix strlen_user with EVA

commit 5dc62fdd upstream.

The strlen_user() function calls __strlen_kernel_asm in both branches of
the eva_kernel_access() conditional. For EVA it should be calling
__strlen_user_eva for user accesses, otherwise it will load from the
kernel address space instead of the user address space, and the access
checking will likely be ineffective at preventing it due to EVA's
overlapping user and kernel address spaces.

This was found after extending the test_user_copy module to cover user
string access functions, which gave the following error with EVA:

test_user_copy: illegal strlen_user passed

Fortunately the use of strlen_user() has been all but eradicated from
the mainline kernel, so only out of tree modules could be affected.

Fixes: e3a9b07a ("MIPS: asm: uaccess: Add EVA support for str*_user operations")
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10842/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 7395e232
...@@ -1397,7 +1397,7 @@ static inline long strlen_user(const char __user *s) ...@@ -1397,7 +1397,7 @@ static inline long strlen_user(const char __user *s)
might_fault(); might_fault();
__asm__ __volatile__( __asm__ __volatile__(
"move\t$4, %1\n\t" "move\t$4, %1\n\t"
__MODULE_JAL(__strlen_kernel_asm) __MODULE_JAL(__strlen_user_asm)
"move\t%0, $2" "move\t%0, $2"
: "=r" (res) : "=r" (res)
: "r" (s) : "r" (s)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment