ARM: 8720/1: ensure dump_instr() checks addr_limit

commit b9dd05c7002ee0ca8b676428b2268c26399b5e31 upstream.

When CONFIG_DEBUG_USER is enabled, it's possible for a user to
deliberately trigger dump_instr() with a chosen kernel address.

Let's avoid problems resulting from this by using get_user() rather than
__get_user(), ensuring that we don't erroneously access kernel memory.

So that we can use the same code to dump user instructions and kernel
instructions, the common dumping code is factored out to __dump_instr(),
with the fs manipulated appropriately in dump_instr() around calls to
this.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index bc698383e82253a47427885359e07e22daa24179..c92b535150a0e7fb3017ad31445a8f431e4337b9 100644 (file)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -132,30 +132,26 @@ static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
        set_fs(fs);
 }
 
-static void dump_instr(const char *lvl, struct pt_regs *regs)
+static void __dump_instr(const char *lvl, struct pt_regs *regs)
 {
        unsigned long addr = instruction_pointer(regs);
        const int thumb = thumb_mode(regs);
        const int width = thumb ? 4 : 8;
-       mm_segment_t fs;
        char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
        int i;
 
        /*
-        * We need to switch to kernel mode so that we can use __get_user
-        * to safely read from kernel space.  Note that we now dump the
-        * code first, just in case the backtrace kills us.
+        * Note that we now dump the code first, just in case the backtrace
+        * kills us.
         */
-       fs = get_fs();
-       set_fs(KERNEL_DS);
 
        for (i = -4; i < 1 + !!thumb; i++) {
                unsigned int val, bad;
 
                if (thumb)
-                       bad = __get_user(val, &((u16 *)addr)[i]);
+                       bad = get_user(val, &((u16 *)addr)[i]);
                else
-                       bad = __get_user(val, &((u32 *)addr)[i]);
+                       bad = get_user(val, &((u32 *)addr)[i]);
 
                if (!bad)
                        p += sprintf(p, i == 0 ? "(%0*x) " : "%0*x ",
@@ -166,8 +162,20 @@ static void dump_instr(const char *lvl, struct pt_regs *regs)
                }
        }
        printk("%sCode: %s\n", lvl, str);
+}
 
-       set_fs(fs);
+static void dump_instr(const char *lvl, struct pt_regs *regs)
+{
+       mm_segment_t fs;
+
+       if (!user_mode(regs)) {
+               fs = get_fs();
+               set_fs(KERNEL_DS);
+               __dump_instr(lvl, regs);
+               set_fs(fs);
+       } else {
+               __dump_instr(lvl, regs);
+       }
 }
 
 #ifdef CONFIG_ARM_UNWIND