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Fix unportable disregard of alignment requirements in RADIUS code.

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The compiler is entitled to store a char[] local variable with no
particular alignment requirement.  Our RADIUS code cavalierly took such
a local variable and cast its address to a struct type that does have
alignment requirements.  On an alignment-picky machine this would lead
to bus errors.  To fix, declare the local variable honestly, and then
cast its address to char * for use in the I/O calls.

Given the lack of field complaints, there must be very few if any
people affected; but nonetheless this is a clear portability issue,
so back-patch to all supported branches.

Noted while looking at a Coverity complaint in the same code.
This commit is contained in:
Tom Lane 2017-03-26 17:35:35 -04:00
parent 5674a258fd
commit c804c00d38
1 changed files with 12 additions and 9 deletions
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21
src/backend/libpq/auth.c
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@ -2355,14 +2355,16 @@ CheckCertAuth(Port *port)
*/
/*
* RADIUS authentication is described in RFC2865 (and several
* others).
* RADIUS authentication is described in RFC2865 (and several others).
*/
#define RADIUS_VECTOR_LENGTH 16
#define RADIUS_HEADER_LENGTH 20
#define RADIUS_MAX_PASSWORD_LENGTH 128
/* Maximum size of a RADIUS packet we will create or accept */
#define RADIUS_BUFFER_SIZE 1024
typedef struct
{
uint8 attribute;
@ -2376,6 +2378,8 @@ typedef struct
uint8 id;
uint16 length;
uint8 vector[RADIUS_VECTOR_LENGTH];
/* this is a bit longer than strictly necessary: */
char pad[RADIUS_BUFFER_SIZE - RADIUS_VECTOR_LENGTH];
} radius_packet;
/* RADIUS packet types */
@ -2392,9 +2396,6 @@ typedef struct
/* RADIUS service types */
#define RADIUS_AUTHENTICATE_ONLY 8
/* Maximum size of a RADIUS packet we will create or accept */
#define RADIUS_BUFFER_SIZE 1024
/* Seconds to wait - XXX: should be in a config variable! */
#define RADIUS_TIMEOUT 3
@ -2429,10 +2430,12 @@ CheckRADIUSAuth(Port *port)
{
char *passwd;
char *identifier = "postgresql";
char radius_buffer[RADIUS_BUFFER_SIZE];
char receive_buffer[RADIUS_BUFFER_SIZE];
radius_packet *packet = (radius_packet *) radius_buffer;
radius_packet *receivepacket = (radius_packet *) receive_buffer;
radius_packet radius_send_pack;
radius_packet radius_recv_pack;
radius_packet *packet = &radius_send_pack;
radius_packet *receivepacket = &radius_recv_pack;
char *radius_buffer = (char *) &radius_send_pack;
char *receive_buffer = (char *) &radius_recv_pack;
int32 service = htonl(RADIUS_AUTHENTICATE_ONLY);
uint8 *cryptvector;
int encryptedpasswordlen;