linux-kernel - [PATCH v2 1/2] powerpc: Fix virt_addr

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Date:   Sat, 25 Dec 2021 20:06:20 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        "Mark Rutland" <mark.rutland@....com>, <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Paul Mackerras" <paulus@...ba.org>,
        <linuxppc-dev@...ts.ozlabs.org>
CC:     Nicholas Piggin <npiggin@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2 1/2] powerpc: Fix virt_addr_valid() check

When run ethtool eth0, the BUG occurred,

  usercopy: Kernel memory exposure attempt detected from SLUB object not in SLUB page?! (offset 0, size 1048)!
  kernel BUG at mm/usercopy.c:99
  ...
  usercopy_abort+0x64/0xa0 (unreliable)
  __check_heap_object+0x168/0x190
  __check_object_size+0x1a0/0x200
  dev_ethtool+0x2494/0x2b20
  dev_ioctl+0x5d0/0x770
  sock_do_ioctl+0xf0/0x1d0
  sock_ioctl+0x3ec/0x5a0
  __se_sys_ioctl+0xf0/0x160
  system_call_exception+0xfc/0x1f0
  system_call_common+0xf8/0x200

The code shows below,

  data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));
  copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))

The data is alloced by vmalloc(), virt_addr_valid(ptr) will return true
on PowerPC64, which leads to the panic.

As commit 4dd7554a6456 ("powerpc/64: Add VIRTUAL_BUG_ON checks for __va
and __pa addresses") does, make sure the virt addr above PAGE_OFFSET in
the virt_addr_valid().

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 arch/powerpc/include/asm/page.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 254687258f42..300d4c105a3a 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -132,7 +132,10 @@ static inline bool pfn_valid(unsigned long pfn)
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

-#define virt_addr_valid(kaddr)	pfn_valid(virt_to_pfn(kaddr))
+#define virt_addr_valid(vaddr)	({						\
+	unsigned long _addr = (unsigned long)vaddr;				\
+	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
+})

 /*
  * On Book-E parts we need __va to parse the device tree and we can't
-- 
2.26.2