mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-24 23:16:42 +00:00
61 lines
2.7 KiB
Diff
61 lines
2.7 KiB
Diff
commit 5874510faaf3cbd0bb112aaacab9f225002beed1
|
|
Author: Joseph Myers <joseph@codesourcery.com>
|
|
Date: Tue Nov 8 23:44:51 2016 +0000
|
|
|
|
Fix rpcgen buffer overrun (bug 20790).
|
|
|
|
Building with GCC 7 produces an error building rpcgen:
|
|
|
|
rpc_parse.c: In function 'get_prog_declaration':
|
|
rpc_parse.c:543:25: error: may write a terminating nul past the end of the destination [-Werror=format-length=]
|
|
sprintf (name, "%s%d", ARGNAME, num); /* default name of argument */
|
|
~~~~^
|
|
rpc_parse.c:543:5: note: format output between 5 and 14 bytes into a destination of size 10
|
|
sprintf (name, "%s%d", ARGNAME, num); /* default name of argument */
|
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
That buffer overrun is for the case where the .x file declares a
|
|
program with a million arguments. The strcpy two lines above can
|
|
generate a buffer overrun much more simply for a long argument name.
|
|
|
|
The limit on length of line read by rpcgen (MAXLINESIZE == 1024)
|
|
provides a bound on the buffer size needed, so this patch just changes
|
|
the buffer size to MAXLINESIZE to avoid both possible buffer
|
|
overruns. A testcase is added that rpcgen does not crash with a
|
|
500-character argument name, where it previously crashed.
|
|
|
|
It would not at all surprise me if there are many other ways of
|
|
crashing rpcgen with either valid or invalid input; fuzz testing would
|
|
likely find various such bugs, though I don't think they are that
|
|
important to fix (rpcgen is not that likely to be used with untrusted
|
|
.x files as input). (As well as fuzz-findable bugs there are probably
|
|
also issues when various int variables get overflowed on very large
|
|
input.) The test infrastructure for rpcgen-not-crashing tests would
|
|
need extending if tests are to be added for cases where rpcgen should
|
|
produce an error, as opposed to cases where it should succeed.
|
|
|
|
Tested for x86_64 and x86.
|
|
|
|
[BZ #20790]
|
|
* sunrpc/rpc_parse.c (get_prog_declaration): Increase buffer size
|
|
to MAXLINESIZE.
|
|
* sunrpc/bug20790.x: New file.
|
|
* sunrpc/Makefile [$(run-built-tests) = yes] (rpcgen-tests): New
|
|
variable.
|
|
[$(run-built-tests) = yes] (tests-special): Add $(rpcgen-tests).
|
|
[$(run-built-tests) = yes] ($(rpcgen-tests)): New rule.
|
|
|
|
diff --git a/sunrpc/rpc_parse.c b/sunrpc/rpc_parse.c
|
|
index 1a1df6d8c2..505a6554cf 100644
|
|
--- a/sunrpc/rpc_parse.c
|
|
+++ b/sunrpc/rpc_parse.c
|
|
@@ -521,7 +521,7 @@ static void
|
|
get_prog_declaration (declaration * dec, defkind dkind, int num /* arg number */ )
|
|
{
|
|
token tok;
|
|
- char name[10]; /* argument name */
|
|
+ char name[MAXLINESIZE]; /* argument name */
|
|
|
|
if (dkind == DEF_PROGRAM)
|
|
{
|