after the acquisition of any advisory locks. This fix corrects a case
in which a process tries to open a file with a non-blocking exclusive
lock. Even if it fails to get the lock it would still truncate the
file even though its open failed. With this change, the truncation
is done only after the lock is successfully acquired.
Obtained from: BSD/OS
o Set access mode to -r--r--r-- if SS_CANTRCVMORE is set and the receive
buffer is empty.
o Set access mode to --w--w--w- is SS_CANTSENDMORE is set.
Discussed with: alfred
instead of a struct iovec * array and int len. Get rid of stupidly trying
to allocate all of the memory and copyin()ing the entire iovec[], and
instead just do the proper VOP_WRITE() in ktrwrite() using a copy of
the struct uio that the syscall originally used.
This solves the DoS which could easily be performed; to work around the
DoS, one could also remove "options KTRACE" from the kernel. This is
a very strong MFC candidate for 4.1.
Found by: art@OpenBSD.org
instead of requiring every caller of linker_load_file() to perform the
check itself. This avoids netgraph loading KLD's when securelevel > 0,
not to mention any future code that may call linker_load_file().
Reviewed by: dfr
On unload, remove references from freelist to memory type defined by module.
Print a warning if module defines and allocate its own memory type, but
didn't free it all on unload.
Reviewed by: peter
Use strtoul(), not strtol() in the hints decoder so that
'flags 0xa0ffa0ff' is not truncated to 0x7fffffff.
Use a stack buffer instead of a static 100 byte bss buffer.
Use \0 for the NUL character.
Remove some ``excessive'' parens.
1) while allocating a uidinfo struct malloc is called with M_WAITOK,
it's possible that while asleep another process by the same user
could have woken up earlier and inserted an entry into the uid
hash table. Having redundant entries causes inconsistancies that
we can't handle.
fix: do a non-waiting malloc, and if that fails then do a blocking
malloc, after waking up check that no one else has inserted an entry
for us already.
2) Because many checks for sbsize were done as "test then set" in a non
atomic manner it was possible to exceed the limits put up via races.
fix: instead of querying the count then setting, we just attempt to
set the count and leave it up to the function to return success or
failure.
3) The uidinfo code was inlining and repeating, lookups and insertions
and deletions needed to be in their own functions for clarity.
Reviewed by: green
When re-adding an event, do not reset the event state. If the event was
pending, it will remain pending. This allows the user to change the udata
field after the event was registered, while not losing any events which
have already occurred.
Reported by: jmg
accept filters are now loadable as well as able to be compiled into
the kernel.
two accept filters are provided, one that returns sockets when data
arrives the other when an http request is completed (doesn't work
with 0.9 requests)
Reviewed by: jmg
need this RSN.
Remove a pointless warning in the root device locating code.
Remove the "wd" compatibility name from the "ad" driver.
WARNING: If you have not updated to use /dev/wd* in your /etc/fstab
and modern bootblocks, it would be a very good idea to do so BEFORE
you upgrade your kernel.
until the incoming connection has either data waiting or what looks like a
HTTP request header already in the socketbuffer. This ought to reduce
the context switch time and overhead for processing requests.
The initial idea and code for HTTPACCEPT came from Yahoo engineers and has
been cleaned up and a more lightweight DELAYACCEPT for non-http servers
has been added
Reviewed by: silence on hackers.
dynamic hints. This allows the resource_XXX_value() calls to work
before malloc() has started. This gets the serial console working as well
as a few other things.
Order the SYSINIT() for MALLOC_DEFINE() correctly so that malloc()
doesn't have to waste time initializing itself. The
(SI_SUB_KMEM, SI_ORDER_ANY) order was shared with syscons' SYSINIT()
for scmeminit(), and scmeminit() calls malloc(), so malloc()
initialization was not always complete on the first call to malloc().
kern/kern_malloc.c:
- Removed self-initialization in malloc().
- Removed half-baked sanity check in free(). Trust MALLOC_DEFINE().
Use Warner Losh's "hint" driver to decode ascii strings to fill the
resource table at boot time.
config(8) no longer generates an ioconf.c table - ie: the configuration
no longer has to be compiled into the kernel. You can reconfigure your
isa devices with the likes of this at loader(8) time:
set hint.ed.0.port=0x320
userconfig will be rewritten to use this style interface one day and will
move to /boot/userconfig.4th or something like that.
It is still possible to statically compile in a set of hints into a kernel
if you do not wish to use loader(8). See the "hints" directive in GENERIC
as an example.
All device wiring has been moved out of config(8). There is a set of
helper scripts (see i386/conf/gethints.pl, and the same for alpha and pc98)
that extract the 'at isa? port foo irq bar' from the old files and produces
a hints file. If you install this file as /boot/device.hints (and update
/boot/defaults/loader.conf - You can do a build/install in sys/boot) then
loader will load it automatically for you. You can also compile in the
hints directly with: hints "device.hints" as well.
There are a few things that I'm not too happy with yet. Under this scheme,
things like LINT would no longer be useful as "documentation" of settings.
I have renamed this file to 'NOTES' and stored the example hints strings
in it. However... this is not something that config(8) understands, so
there is a script that extracts the build-specific data from the
documentation file (NOTES) to produce a LINT that can be config'ed and
built. A stack of man4 pages will need updating. :-/
Also, since there is no longer a difference between 'device' and
'pseudo-device' I collapsed the two together, and the resulting 'device'
takes a 'number of units' for devices that still have it statically
allocated. eg: 'device fe 4' will compile the fe driver with NFE set
to 4. You can then set hints for 4 units (0 - 3). Also note that
'device fe0' will be interpreted as "zero units of 'fe'" which would be
bad, so there is a config warning for this. This is only needed for
old drivers that still have static limits on numbers of units.
All the statically limited drivers that I could find were marked.
Please exercise EXTREME CAUTION when transitioning!
Moral support by: phk, msmith, dfr, asmodai, imp, and others
required (rounded up a little) instead of twice the previous amount (or
a fixed amount for the first allocation).
The bug caused memory corruption when a new unit number for a devclass
was more than about twice the previous maximum one (or more than 3 for
the first one), so it corrupted memory (which happened to be the atkbdc
port resource list) in the reporter's configuration with sio unit
numbers { 0, 25, 1, 2, ... }.
Reviewed by: dfr
Reported by: Leonid Lukiyanets <stalwar78@hotmail.com>
handling for this case (which was slightly broken anyway)
Fix up some whitespace problems while I'm here too.
Submitted by: alfred (in a slightly different form)
Trimmed an extra sysctl when I moved kern.suser_permitted from kern_mib.c
to kern_prot.c. This commit should restore it, as well as fix the
resulting build problems.
Submitted by: asmodai
kern_prot, which cleans up some namespace issues
o Don't need a special handler to limit un-setting, as suser is used to
protect suser_permitted, making it one-way by definition.
Suggested by: bde
returning anything but EPERM.
o suser is enabled by default; once disabled, cannot be reenabled
o To be used in alternative security models where uid0 does not connote
additional privileges
o Should be noted that uid0 still has some additional powers as it
owns many important files and executables, so suffers from the same
fundamental security flaws as securelevels. This is fixed with
MAC integrity protection code (in progress)
o Not safe for consumption unless you are *really* sure you don't want
things like shutdown to work, et al :-)
Obtained from: TrustedBSD Project
TCP/IP (v4) sockets, and routing sockets. Previously, interaction
with IPv6 was not well-defined, and might be inappropriate for some
environments. Similarly, sysctl MIB entries providing interface
information also give out only addresses from those protocol domains.
For the time being, this functionality is enabled by default, and
toggleable using the sysctl variable jail.socket_unixiproute_only.
In the future, protocol domains will be able to determine whether or
not they are ``jail aware''.
o Further limitations on process use of getpriority() and setpriority()
by jailed processes. Addresses problem described in kern/17878.
Reviewed by: phk, jmg
