[kernel-hardening] [PATCH v2 2/3] vsprintf: print <no-symbol> if symbol not found

Tobin C. Harding
2017-12-19T03:28:13Z

Depends on: commit 40eee173a35e ("kallsyms: don't leak address when
symbol not found")

Currently vsprintf for specifiers %p[SsB] relies on the behaviour of
kallsyms (sprint_symbol()) and prints the actual address if a symbol is
not found. Previous patch changes this behaviour so that sprint_symbol()
returns an error if symbol not found. With this patch in place we can
print a sanitized message '<symbol not found>' instead of leaking the
address.

Print '<symbol not found>' for printk specifier %p[sSB] if symbol look
up fails.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
---
lib/vsprintf.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 01c3957b2de6..820ed4fe6e6c 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -674,6 +674,8 @@ char *symbol_string(char *buf, char *end, void *ptr,
unsigned long value;
#ifdef CONFIG_KALLSYMS
char sym[KSYM_SYMBOL_LEN];
+ const char *sym_not_found = "<symbol not found>";
+ int ret;
#endif

if (fmt[1] == 'R')
@@ -682,11 +684,14 @@ char *symbol_string(char *buf, char *end, void *ptr,

#ifdef CONFIG_KALLSYMS
if (*fmt == 'B')
- sprint_backtrace(sym, value);
+ ret = sprint_backtrace(sym, value);
else if (*fmt != 'f' && *fmt != 's')
- sprint_symbol(sym, value);
+ ret = sprint_symbol(sym, value);
else
- sprint_symbol_no_offset(sym, value);
+ ret = sprint_symbol_no_offset(sym, value);
+
+ if (ret == -1)
+ strcpy(sym, sym_not_found);

return string(buf, end, sym, spec);
#else
--
2.7.4