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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-29 20:28:09 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-29 20:28:09 +0100 |
| commit | ef0010a30935de4e0211cbc7bdffc30446cdee9b (patch) | |
| tree | 8390d91f247b724dd00ad91f25d8bcf391e3a52c /lib | |
| parent | kallsyms: take advantage of the new '%px' format (diff) | |
| download | linux-ef0010a30935de4e0211cbc7bdffc30446cdee9b.tar.xz linux-ef0010a30935de4e0211cbc7bdffc30446cdee9b.zip | |
vsprintf: don't use 'restricted_pointer()' when not restricting
Instead, just fall back on the new '%p' behavior which hashes the
pointer.
Otherwise, '%pK' - that was intended to mark a pointer as restricted -
just ends up leaking pointers that a normal '%p' wouldn't leak. Which
just make the whole thing pointless.
I suspect we should actually get rid of '%pK' entirely, and make it just
work as '%p' regardless, but this is the minimal obvious fix. People
who actually use 'kptr_restrict' should weigh in on which behavior they
want.
Cc: Tobin Harding <me@tobin.cc>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vsprintf.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index d960aead0336..01c3957b2de6 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1931,6 +1931,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, return buf; } case 'K': + if (!kptr_restrict) + break; return restricted_pointer(buf, end, ptr, spec); case 'N': return netdev_bits(buf, end, ptr, fmt); |