From 0d0138ebe24b94065580bd2601f8bb7eb6152f56 Mon Sep 17 00:00:00 2001 From: Dan Rosenberg Date: Mon, 25 Jul 2011 17:11:53 -0700 Subject: xtensa: prevent arbitrary read in ptrace Prevent an arbitrary kernel read. Check the user pointer with access_ok() before copying data in. [akpm@linux-foundation.org: s/EIO/EFAULT/] Signed-off-by: Dan Rosenberg Cc: Christian Zankel Cc: Oleg Nesterov Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/xtensa/kernel/ptrace.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/xtensa') diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index c72c9473ef99..a0d042aa2967 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -147,6 +147,9 @@ int ptrace_setxregs(struct task_struct *child, void __user *uregs) elf_xtregs_t *xtregs = uregs; int ret = 0; + if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t))) + return -EFAULT; + #if XTENSA_HAVE_COPROCESSORS /* Flush all coprocessors before we overwrite them. */ coprocessor_flush_all(ti); -- cgit v1.2.3 From 90b03f5052be92ab0ba0aa36abcf33a207706866 Mon Sep 17 00:00:00 2001 From: WANG Cong Date: Mon, 25 Jul 2011 17:11:54 -0700 Subject: xtensa: fix a build error in arch/xtensa/include/asm/uaccess.h Fix the following build error: arch/xtensa/include/asm/uaccess.h:403: error: implicit declaration of function 'prefetch' arch/xtensa/include/asm/uaccess.h:412: error: implicit declaration of function 'prefetchw' Signed-off-by: WANG Cong Cc: Chris Zankel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/xtensa/include/asm/uaccess.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/xtensa') diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h index 5b0c18c1cce1..c141b115d3be 100644 --- a/arch/xtensa/include/asm/uaccess.h +++ b/arch/xtensa/include/asm/uaccess.h @@ -17,6 +17,7 @@ #define _XTENSA_UACCESS_H #include +#include #define VERIFY_READ 0 #define VERIFY_WRITE 1 -- cgit v1.2.3