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Verify vector version and length before relying on the DSO's vector.

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This commit is contained in:
nelsonb%netscape.com 2000-12-28 03:26:29 +00:00
parent 56caa19b5a
commit 4a9ba412bb
1 changed files with 15 additions and 6 deletions
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21
security/nss/lib/freebl/loader.c
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@ -32,7 +32,7 @@
* may use your version of this file under either the MPL or the
* GPL.
*
* $Id: loader.c,v 1.1 2000/12/27 03:20:03 nelsonb%netscape.com Exp $
* $Id: loader.c,v 1.2 2000/12/28 03:26:29 nelsonb%netscape.com Exp $
*/
#include "loader.h"
@ -91,6 +91,9 @@ isHybrid(void)
#error "code for this platform is missing."
#endif
#define LSB(x) ((x)&0xff)
#define MSB(x) ((x)>>8)
static const FREEBLVector *vector;
/* This function must be run only once. */
@ -116,11 +119,17 @@ freebl_LoadDSO( void )
if (handle) {
void * address = PR_FindSymbol(handle, "FREEBL_GetVector");
if (address) {
FREEBLGetVectorFn * getVector = (FREEBLGetVectorFn *)address;
const FREEBLVector * myVector = getVector();
if (myVector) {
vector = myVector;
return PR_SUCCESS;
FREEBLGetVectorFn * getVector = (FREEBLGetVectorFn *)address;
const FREEBLVector * dsoVector = getVector();
if (dsoVector) {
unsigned short dsoVersion = dsoVector->version;
unsigned short myVersion = FREEBL_VERSION;
if (MSB(dsoVersion) == MSB(myVersion) &&
LSB(dsoVersion) >= LSB(myVersion) &&
dsoVector->length >= sizeof(FREEBLVector)) {
vector = dsoVector;
return PR_SUCCESS;
}
}
}
PR_UnloadLibrary(handle);