vsprintf: don't obfuscate NULL and error pointers

I don't see what security concern is addressed by obfuscating NULL
and IS_ERR() error pointers, printed with %p/%pK.  Given the number
of sites where %p is used (over 10000) and the fact that NULL pointers
aren't uncommon, it probably wouldn't take long for an attacker to
find the hash that corresponds to 0.  Although harder, the same goes
for most common error values, such as -1, -2, -11, -14, etc.

The NULL part actually fixes a regression: NULL pointers weren't
obfuscated until commit 709e351fca29 ("vsprintf: Prevent crash when
dereferencing invalid pointers") which went into 5.2.  I'm tacking
the IS_ERR() part on here because error pointers won't leak kernel
addresses and printing them as pointers shouldn't be any different
from e.g. %d with PTR_ERR_OR_ZERO().  Obfuscating them just makes
debugging based on existing pr_debug and friends excruciating.

Note that the "always print 0's for %pK when kptr_restrict == 2"
behaviour which goes way back is left as is.

Example output with the patch applied:

                             ptr         error-ptr              NULL
 %p:            0000000001f8cc5b  fffffffffffffff2  0000000000000000
 %pK, kptr = 0: 0000000001f8cc5b  fffffffffffffff2  0000000000000000
 %px:           ffff888048c04020  fffffffffffffff2  0000000000000000
 %pK, kptr = 1: ffff888048c04020  fffffffffffffff2  0000000000000000
 %pK, kptr = 2: 0000000000000000  0000000000000000  0000000000000000

Fixes: 709e351fca29 ("vsprintf: Prevent crash when dereferencing invalid pointers")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 2d9f520d2f275ca95562a01371a0bd33c9278505..6b1622f4d7c2536efc743e9ee9e00f710a3d63d3 100644 (file)
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -214,6 +214,7 @@ test_string(void)
 #define PTR_STR "ffff0123456789ab"
 #define PTR_VAL_NO_CRNG "(____ptrval____)"
 #define ZEROS "00000000"       /* hex 32 zero bits */
+#define ONES "ffffffff"                /* hex 32 one bits */
 
 static int __init
 plain_format(void)
@@ -245,6 +246,7 @@ plain_format(void)
 #define PTR_STR "456789ab"
 #define PTR_VAL_NO_CRNG "(ptrval)"
 #define ZEROS ""
+#define ONES ""
 
 static int __init
 plain_format(void)
@@ -330,14 +332,28 @@ test_hashed(const char *fmt, const void *p)
        test(buf, fmt, p);
 }
 
+/*
+ * NULL pointers aren't hashed.
+ */
 static void __init
 null_pointer(void)
 {
-       test_hashed("%p", NULL);
+       test(ZEROS "00000000", "%p", NULL);
        test(ZEROS "00000000", "%px", NULL);
        test("(null)", "%pE", NULL);
 }
 
+/*
+ * Error pointers aren't hashed.
+ */
+static void __init
+error_pointer(void)
+{
+       test(ONES "fffffff5", "%p", ERR_PTR(-11));
+       test(ONES "fffffff5", "%px", ERR_PTR(-11));
+       test("(efault)", "%pE", ERR_PTR(-11));
+}
+
 #define PTR_INVALID ((void *)0x000000ab)
 
 static void __init
@@ -649,6 +665,7 @@ test_pointer(void)
 {
        plain();
        null_pointer();
+       error_pointer();
        invalid_pointer();
        symbol_ptr();
        kernel_ptr();

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 532b6606a18a605c34335b81cdb371d0d04a8b45..7c47ad52ce2f7448cda5da17cb2bf25527b0eb12 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -794,6 +794,13 @@ static char *ptr_to_id(char *buf, char *end, const void *ptr,
        unsigned long hashval;
        int ret;
 
+       /*
+        * Print the real pointer value for NULL and error pointers,
+        * as they are not actual addresses.
+        */
+       if (IS_ERR_OR_NULL(ptr))
+               return pointer_string(buf, end, ptr, spec);
+
        /* When debugging early boot use non-cryptographically secure hash. */
        if (unlikely(debug_boot_weak_hash)) {
                hashval = hash_long((unsigned long)ptr, 32);