The BadAccess from ShmAttach is coming from the Xorg process somewhere
in here:
static int
ProcShmAttach(ClientPtr client)
{
SHMSTAT_TYPE buf;
ShmDescPtr shmdesc;
REQUEST(xShmAttachReq);
REQUEST_SIZE_MATCH(xShmAttachReq);
LEGAL_NEW_RESOURCE(stuff->shmseg, client);
if ((stuff->readOnly != xTrue) && (stuff->readOnly != xFalse)) {
client->errorValue = stuff->readOnly;
return BadValue;
}
for (shmdesc = Shmsegs; shmdesc; shmdesc = shmdesc->next) {
if (!SHMDESC_IS_FD(shmdesc) && shmdesc->shmid == stuff->shmid)
break;
}
if (shmdesc) {
if (!stuff->readOnly && !shmdesc->writable)
return BadAccess;
shmdesc->refcnt++;
}
else {
shmdesc = malloc(sizeof(ShmDescRec));
if (!shmdesc)
return BadAlloc;
#ifdef SHM_FD_PASSING
shmdesc->is_fd = FALSE;
#endif
shmdesc->addr = shmat(stuff->shmid, 0,
stuff->readOnly ? SHM_RDONLY : 0);
if ((shmdesc->addr == ((char *) -1)) || SHMSTAT(stuff->shmid, &buf)) {
free(shmdesc);
return BadAccess;
}
/* The attach was performed with root privs. We must
* do manual checking of access rights for the credentials
* of the client */
if (shm_access(client, &(SHM_PERM(buf)), stuff->readOnly) == -1) {
shmdt(shmdesc->addr);
free(shmdesc);
return BadAccess;
}
shmdesc->shmid = stuff->shmid;
shmdesc->refcnt = 1;
shmdesc->writable = !stuff->readOnly;
shmdesc->size = SHM_SEGSZ(buf);
shmdesc->next = Shmsegs;
Shmsegs = shmdesc;
}
if (!AddResource(stuff->shmseg, ShmSegType, (void *) shmdesc))
return BadAlloc;
return Success;
}
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https://bugs.launchpad.net/bugs/1751252
Title:
[regression] ubiquity crashed in debconf.py:104 with ValueError:
invalid literal for int() with base 10: ''
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