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SCP: Avoid potential buffer overruns by using strlcpy() and strlcat()

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This commit is contained in:
Mark Pizzolato
2019-03-08 12:31:01 -08:00
parent 72451ba202
commit c7b0928b33
5 changed files with 35 additions and 33 deletions
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16
sim_disk.c
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@@ -1489,8 +1489,7 @@ if (sim_switches & SWMASK ('C')) { /* create vhd disk & cop
if (r == SCPE_OK) {
created = TRUE;
copied = TRUE;
tbuf[sizeof(tbuf)-1] = '\0';
strncpy (tbuf, gbuf, sizeof(tbuf)-1);
strlcpy (tbuf, gbuf, sizeof(tbuf)-1);
cptr = tbuf;
sim_disk_set_fmt (uptr, 0, "VHD", NULL);
sim_switches = saved_sim_switches;
@@ -1564,7 +1563,7 @@ uptr->filename = (char *) calloc (CBUFSIZE, sizeof (char));/* alloc name buf */
uptr->disk_ctx = ctx = (struct disk_context *)calloc(1, sizeof(struct disk_context));
if ((uptr->filename == NULL) || (uptr->disk_ctx == NULL))
return _err_return (uptr, SCPE_MEM);
strncpy (uptr->filename, cptr, CBUFSIZE); /* save name */
strlcpy (uptr->filename, cptr, CBUFSIZE); /* save name */
ctx->sector_size = (uint32)sector_size; /* save sector_size */
ctx->capac_factor = ((dptr->dwidth / dptr->aincr) == 16) ? 2 : 1; /* save capacity units (word: 2, byte: 1) */
ctx->xfer_element_size = (uint32)xfer_element_size; /* save xfer_element_size */
@@ -3489,8 +3488,10 @@ if ((sDynamic) &&
if ((0 == memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID))) &&
((sDynamic->ParentTimeStamp == ParentModificationTime) ||
((NtoHl(sDynamic->ParentTimeStamp)-NtoHl(ParentModificationTime)) == 3600) ||
(sim_switches & SWMASK ('O'))))
strncpy (szParentVHDPath, CheckPath, ParentVHDPathSize);
(sim_switches & SWMASK ('O')))) {
memset (szParentVHDPath, 0, ParentVHDPathSize);
strlcpy (szParentVHDPath, CheckPath, ParentVHDPathSize);
}
else {
if (0 != memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID)))
sim_printf ("Error Invalid Parent VHD '%s' for Differencing VHD: %s\n", CheckPath, szVHDPath);
@@ -4092,7 +4093,7 @@ char *wd = getcwd(buffer, PATH_MAX);
if ((szFileSpec[0] != '/') || (strchr (szFileSpec, ':')))
snprintf (szFullFileSpecBuffer, BufferSize, "%s/%s", wd, szFileSpec);
else
strncpy (szFullFileSpecBuffer, szFileSpec, BufferSize);
strlcpy (szFullFileSpecBuffer, szFileSpec, BufferSize);
if ((c = strstr (szFullFileSpecBuffer, "]/")))
memmove (c+1, c+2, strlen(c+2)+1);
memset (szFullFileSpecBuffer + strlen (szFullFileSpecBuffer), 0, BufferSize - strlen (szFullFileSpecBuffer));
@@ -4106,7 +4107,8 @@ HostPathToVhdPath (const char *szHostPath,
{
char *c, *d;
strncpy (szVhdPath, szHostPath, VhdPathSize-1);
memset (szVhdPath, 0, VhdPathSize);
strlcpy (szVhdPath, szHostPath, VhdPathSize-1);
if ((szVhdPath[1] == ':') && islower(szVhdPath[0]))
szVhdPath[0] = toupper(szVhdPath[0]);
szVhdPath[VhdPathSize-1] = '\0';