The patch titled
Subject: lib/vsprintf.c: eliminate potential race in string()
has been added to the -mm tree. Its filename is
lib-vsprintfc-eliminate-potential-race-in-string.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-vsprintfc-eliminate-potential-race-in-string.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-vsprintfc-eliminate-potential-race-in-string.patch
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------------------------------------------------------
From: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Subject: lib/vsprintf.c: eliminate potential race in string()
If the string corresponding to a %s specifier can change under us, we
might end up copying a \0 byte to the output buffer. There might be
callers who expect the output buffer to contain a genuine C string
whose length is exactly the snprintf return value (assuming truncation
hasn't happened or has been checked for).
We can avoid this by only passing over the source string once,
stopping the first time we meet a nul byte (or when we reach the given
precision), and then letting widen_string() handle left/right space
padding. As a small bonus, this code reuse also makes the generated
code slightly smaller.
Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Maurizio Lombardi <mlombard@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/vsprintf.c | 28 +++++++++-------------------
1 file changed, 9 insertions(+), 19 deletions(-)
diff -puN lib/vsprintf.c~lib-vsprintfc-eliminate-potential-race-in-string lib/vsprintf.c
--- a/lib/vsprintf.c~lib-vsprintfc-eliminate-potential-race-in-string
+++ a/lib/vsprintf.c
@@ -557,32 +557,22 @@ char *widen_string(char *buf, int n, cha
static noinline_for_stack
char *string(char *buf, char *end, const char *s, struct printf_spec spec)
{
- int len, i;
+ int len = 0;
+ size_t lim = spec.precision;
if ((unsigned long)s < PAGE_SIZE)
s = "(null)";
- len = strnlen(s, spec.precision);
-
- if (!(spec.flags & LEFT)) {
- while (len < spec.field_width--) {
- if (buf < end)
- *buf = ' ';
- ++buf;
- }
- }
- for (i = 0; i < len; ++i) {
+ while (lim--) {
+ char c = *s++;
+ if (!c)
+ break;
if (buf < end)
- *buf = *s;
- ++buf; ++s;
- }
- while (len < spec.field_width--) {
- if (buf < end)
- *buf = ' ';
+ *buf = c;
++buf;
+ ++len;
}
-
- return buf;
+ return widen_string(buf, len, end, spec);
}
static noinline_for_stack
_
Patches currently in -mm which might be from linux@xxxxxxxxxxxxxxxxxx are
lib-vsprintfc-pull-out-padding-code-from-dentry_name.patch
lib-vsprintfc-move-string-below-widen_string.patch
lib-vsprintfc-eliminate-potential-race-in-string.patch
lib-vsprintfc-expand-field_width-to-24-bits.patch
lib-vsprintfc-help-gcc-make-number-smaller.patch
lib-vsprintfc-warn-about-too-large-precisions-and-field-widths.patch
lib-kasprintfc-add-sanity-check-to-kvasprintf.patch
lib-test_printfc-dont-bug.patch
lib-test_printfc-check-for-out-of-bound-writes.patch
lib-test_printfc-test-precision-quirks.patch
lib-test_printfc-add-a-few-number-tests.patch
lib-test_printfc-account-for-kvasprintf-tests.patch
lib-test_printfc-add-test-for-large-bitmaps.patch
lib-test_printfc-test-dentry-printing.patch
powerpc-fadump-rename-cpu_online_mask-member-of-struct-fadump_crash_info_header.patch
kernel-cpuc-change-type-of-cpu_possible_bits-and-friends.patch
kernel-cpuc-export-__cpu__mask.patch
drivers-base-cpuc-use-__cpu__mask-directly.patch
kernel-cpuc-eliminate-cpu__mask.patch
kernel-cpuc-make-set_cpu_-static-inlines.patch
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