Thanks. The solution looks good. I recommend to add more comments below: // Because the function does not actually print anything to buf, it returns -1 as error. // Otherwise, the consumer may think that the buf is valid and parse the buffer.
With comment change, reviewed-by: Jiewen Yao <[email protected]> > -----Original Message----- > From: Li, Yi1 <[email protected]> > Sent: Sunday, September 25, 2022 5:40 PM > To: [email protected]; Li, Yi1 <[email protected]>; Yao, Jiewen > <[email protected]> > Cc: Wang, Jian J <[email protected]>; Lu, Xiaoyu1 > <[email protected]>; Jiang, Guomin <[email protected]> > Subject: RE: [edk2-devel] [PATCH 1/1] CryptoPkg: Fix pem heap-buffer- > overflow due to BIO_snprintf() > > Hi Jiewen, > Can you take a look at this patch? > WPA3 Tls API fuzzing is blocked because of same pem API. > > Thanks, > Yi > > -----Original Message----- > From: [email protected] <[email protected]> On Behalf Of yi1 li > Sent: Thursday, September 22, 2022 8:53 PM > To: [email protected] > Cc: Li, Yi1 <[email protected]>; Yao, Jiewen <[email protected]>; Wang, > Jian J <[email protected]>; Lu, Xiaoyu1 <[email protected]>; Jiang, > Guomin <[email protected]> > Subject: [edk2-devel] [PATCH 1/1] CryptoPkg: Fix pem heap-buffer-overflow > due to BIO_snprintf() > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4075 > > Fake BIO_snprintf() need to return error status -1. 0 will be considered a > correct return value, this may cause crash, please refer to bugzilla link for > details. > > Signed-off-by: Yi Li <[email protected]> > > Cc: Jiewen Yao <[email protected]> > Cc: Jian J Wang <[email protected]> > Cc: Xiaoyu Lu <[email protected]> > Cc: Guomin Jiang <[email protected]> > --- > CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c > b/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c > index c1fc33538f..d7d8c206ed 100644 > --- a/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c > +++ b/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c > @@ -494,7 +494,7 @@ BIO_snprintf ( > ... > ) > { > - return 0; > + return -1; > } > > #ifdef __GNUC__ > -- > 2.31.1.windows.1 > > > > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#94293): https://edk2.groups.io/g/devel/message/94293 Mute This Topic: https://groups.io/mt/93847550/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
