From: Andrew Donnellan <ajd@xxxxxxxxxxxxx>
commit 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7 upstream.
The KUAP implementation adds calls in clear_user() to enable and
disable access to userspace memory. However, it doesn't add these to
__clear_user(), which is used in the ptrace regset code.
As there's only one direct user of __clear_user() (the regset code),
and the time taken to set the AMR for KUAP purposes is going to
dominate the cost of a quick access_ok(), there's not much point
having a separate path.
Rename __clear_user() to __arch_clear_user(), and make __clear_user()
just call clear_user().
Reported-by: syzbot+f25ecf4b2982d8c7a640@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: Daniel Axtens <dja@xxxxxxxxxx>
Suggested-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Fixes: de78a9c42a79 ("powerpc: Add a framework for Kernel Userspace Access Protection")
Signed-off-by: Andrew Donnellan <ajd@xxxxxxxxxxxxx>
[mpe: Use __arch_clear_user() for the asm version like arm64 & nds32]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191209132221.15328-1-ajd@xxxxxxxxxxxxx
Signed-off-by: Daniel Axtens <dja@xxxxxxxxxx>
---
arch/powerpc/include/asm/uaccess.h | 9 +++++++--
arch/powerpc/kernel/ppc_ksyms.c | 3 +++
arch/powerpc/lib/string.S | 2 +-
arch/powerpc/lib/string_64.S | 4 ++--
4 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index f0195ad25836..edf211b5ada0 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -471,7 +471,7 @@ static inline unsigned long __copy_to_user(void __user *to,
return __copy_to_user_inatomic(to, from, size);
}
-extern unsigned long __clear_user(void __user *addr, unsigned long size);
+unsigned long __arch_clear_user(void __user *addr, unsigned long size);
static inline unsigned long clear_user(void __user *addr, unsigned long size)
{
@@ -479,12 +479,17 @@ static inline unsigned long clear_user(void __user *addr, unsigned long size)
might_fault();
if (likely(access_ok(VERIFY_WRITE, addr, size))) {
allow_write_to_user(addr, size);
- ret = __clear_user(addr, size);
+ ret = __arch_clear_user(addr, size);
prevent_write_to_user(addr, size);
}
return ret;
}
+static inline unsigned long __clear_user(void __user *addr, unsigned long size)
+{
+ return clear_user(addr, size);
+}
+
extern long strncpy_from_user(char *dst, const char __user *src, long count);
extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *str, long n);
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 202963ee013a..b92debacb821 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -5,6 +5,7 @@
#include <asm/switch_to.h>
#include <asm/cacheflush.h>
#include <asm/epapr_hcalls.h>
+#include <asm/uaccess.h>
EXPORT_SYMBOL(flush_dcache_range);
EXPORT_SYMBOL(flush_icache_range);
@@ -43,3 +44,5 @@ EXPORT_SYMBOL(epapr_hypercall_start);
#endif
EXPORT_SYMBOL(current_stack_pointer);
+
+EXPORT_SYMBOL(__arch_clear_user);
diff --git a/arch/powerpc/lib/string.S b/arch/powerpc/lib/string.S
index c80fb49ce607..93c4c34ad091 100644
--- a/arch/powerpc/lib/string.S
+++ b/arch/powerpc/lib/string.S
@@ -122,7 +122,7 @@ _GLOBAL(memchr)
blr
#ifdef CONFIG_PPC32
-_GLOBAL(__clear_user)
+_GLOBAL(__arch_clear_user)
addi r6,r3,-4
li r3,0
li r5,0
diff --git a/arch/powerpc/lib/string_64.S b/arch/powerpc/lib/string_64.S
index 7bd9549a90a2..14d26ad2cd69 100644
--- a/arch/powerpc/lib/string_64.S
+++ b/arch/powerpc/lib/string_64.S
@@ -27,7 +27,7 @@ PPC64_CACHES:
.section ".text"
/**
- * __clear_user: - Zero a block of memory in user space, with less checking.
+ * __arch_clear_user: - Zero a block of memory in user space, with less checking.
* @to: Destination address, in user space.
* @n: Number of bytes to zero.
*
@@ -77,7 +77,7 @@ err3; stb r0,0(r3)
mr r3,r4
blr
-_GLOBAL_TOC(__clear_user)
+_GLOBAL_TOC(__arch_clear_user)
cmpdi r4,32
neg r6,r3
li r0,0
--
2.25.1
