These warnings don't make sense for code that implements
the locking primitives.
Reviewed by: kib
MFC after: 3 days
Sponsored by: Dell EMC
Differential Revision: https://reviews.freebsd.org/D10832
Fix warnings about the following when WARNS=6 (which I will commit soon):
- casting away const
- no previous 'extern' declaration for non-static variable
- others as explained by #pragmas and comments
- unused parameters
The last is the only functional change.
Reviewed by: kib
MFC after: 3 days
Sponsored by: Dell EMC
Differential Revision: https://reviews.freebsd.org/D10808
always perform recursion on the left partition, then use a tail call to
handle the right partition. In the worst case this could require O(N)
levels of recursions.
Reduce the possible recursion level to log2(N) by always recursing on the
smaller partition instead.
Obtained from: PostgreSQL 9d6077abf9d6efd992a59f05ef5aba981ea32096
The first test triggers the out of bounds read of the 'left' array. It
only fails when realpath.c is compiled with '-fsanitize=address'.
The other test checks for ENOENT when running into an empty
symlink. This matches NetBSD's realpath(3) semantics. Previously,
empty symlinks were treated like ".".
Submitted by: Jan Kokemц╪ller <jan.kokemueller@gmail.com>
PR: 219154
MFC after: 2 weeks
With ip fragment reassembly implemented, it makes sense to allow
larger nfs reads. Note due to loader heap size limit, we do not want
to set too large maximum read size. Also we do not change default read size.
Reviewed by: bcr, allanjude
Differential Revision: https://reviews.freebsd.org/D10754
Implement simple separate ip module and fragment re-assembly.
The work is based on send and receive previously implemented in udp.c,
moved to ip.c and added the ip fragment re-assembly.
This change allows to specify larger tftp or nfs payload, such as:
tftp.blksize=4096 or nfs.read_size=4096
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D10631
_local_initshells did not reset cp to the beginning of the line buffer
for every iteration that it called fgets(3), leading to writing past the
end of line with fairly long /etc/shells or excessively long line
lengths. Correct this by properly resetting cp.
PR: 192528
Submitted by: Kyle Evans <kevans91@ksu.edu>
Reviewed by: cem, jilles
Differential Revision: https://reviews.freebsd.org/D10690
If realpath() allocated memory for result and failed, the memory is
freed in each place where return is performed. More, the function
needs to track the allocation status, to not free user-supplied
buffer.
Consolidate the memory handling in the wrapper, freeing the buffer if
the actual worker failed.
Reviewed by: emaste (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D10670
- The statement "left_len -= s - left;" does not take the slash into
account if one was found. This results in the invariant
"left[left_len] == '\0'" being violated (and possible buffer
overflows). The patch replaces the variable "s" with a size_t
"next_token_len" for more clarity.
- "slen" from readlink(2) can be 0 when encountering empty
symlinks. Then, further down, "symlink[slen - 1]" underflows the
buffer. When slen == 0, realpath(3) should probably return ENOENT
(http://austingroupbugs.net/view.php?id=825,
https://lwn.net/Articles/551224/).
Some other minor issues:
- The condition "resolved_len >= PATH_MAX" cannot be true.
- Similarly, "s - left >= sizeof(next_token)" cannot be true, as long
as "sizeof(next_token) >= sizeof(left)".
- Return ENAMETOOLONG when a resolved symlink from readlink(2) is too
long for the symlink buffer (instead of just truncating it).
- "resolved_len > 1" below the call to readlink(2) is always true as
"strlcat(resolved, next_token, PATH_MAX);" always results in a
string of length > 1. Also, "resolved[resolved_len - 1] = '\0';" is
not needed; there can never be a trailing slash here.
- The truncation check for "strlcat(symlink, left, sizeof(symlink));"
should be against "sizeof(symlink)" (the third argument to strlcat)
instead of "sizeof(left)".
Submitted by: Jan Kokemц╪ller <jan.kokemueller@gmail.com>
PR: 219154
MFC after: 2 weeks
an inexact floating point exception. The variable cannot be eliminated,
unfortunately, otherwise the desired addition triggering the exception
will be emitted neither by clang, nor by gcc.
Reviewed by: Steve Kargl, bde
MFC after: 3 days
lib/libmt/mtlib.c:
Add the LTO-8 density code to the density table in libmt.
usr.bin/mt/mt.1:
Add the LTO-8 density code, tracks, bpmm, and bpi to the density
table in the mt(1) man page.
MFC after: 3 days
Sponsored by: Spectra Logic
The current read from network is working from up to down - we have some
protocol needing the data from the network, so we build the buffer space
for that protocol, add the extra space for headers and pass this buffer
down to be filled by nif get call in hope, we have guessed the incoming
packet size right. Amazingly enough this approach mostly does work, but
not always...
So, this update does work from down to up - we allocate buffer (based
on MTU or frame size info), fill it up, and pass on for upper layers.
The obvious problem is that when we should free the buffer - if at all.
In the current implementation the upper layer will free the packet on error
or when the packet is no longer needed.
While working on the issue, the additional issue did pop up - the bios
implementation does not have generic get/put interface but is using pxe
udpsend/udpreceive instead. So the udp calls are gone and undi interface
is implemented instead. Which in turn means slight other changes as we
do not need to have duplicated pxe implementation and can just use dev_net.
To align packet content, the actual read from nic is using shifted buffer by
ETHER_ALIGN (2).
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D10232
Don't use DHCP 150 option to decide which protocol use to netboot. When
root-path includes ip address - go thru NFS, if ip address not exists in
root-path - go thru TFTP from server which ip address is in next-server. But
there is one limitation - only one tftp server in network to provide loader and
everything else. Does enybody use more than only one?
Submitted by: kczekirda
Sponsored by: Oktawave
MFC after: 3 weeks
Relnote: Yes
Differential Revision: https://reviews.freebsd.org/D8740
The previous misuse of sys_sigqueue() was sending random register or
stack garbage to 64-bit targets. The freebsd32 implementation preserves
the sival_int member of value when signaling a 64-bit process.
Document the mixed ABI implementation of union sigval and the
incompability of sival_ptr with pointer integrity schemes.
Reviewed by: kib, wblock
MFC after: 1 week
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D10605
Trivial style(9) fix, no functional change. There are also some 81
characters lines below, but I don't see a good way to shorten them.
Sponsored by: Dell EMC Isilon
Adapt glob's match() routine to use a greedy algorithm that avoids
exponential runtime in byzantine inputs.
While here, add a testcase for the byzantine input.
Prompted by: https://research.swtch.com/glob
Authored by: Yves Orton <demerphq at gmail.com>
Obtained from: Perl (33252c318625f3c6c89b816ee88481940e3e6f95)
Sponsored by: Dell EMC Isilon
When passed the invalid regular expression "a**", the error is
eventually detected and seterr() is called. It sets p->error
appropriatly and p->next and p->end to nuls which is a never used char
nuls[10] which is zeros due to .bss initialization. Unfortunatly,
p_ere_exp() and p_simp_re() both have fall through cases where they set
the error, decrement p->next and access it which means a read from what
ever .bss variable comes before nuls.
Found with regex_test:repet_multi and CHERI bounds checking.
Reviewed by: ngie, pfg, emaste
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D10541
Accomplish this by allocating space for it in __svc_xports and allowing
it to be registered. The failure to allocate space was causing an
out-of-bounds read in svc_getreq_common(). The failure to register
caused PR 211804.
The bug was found with CHERI bounds checking.
PR: 211804
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Reviewed by: ngie
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D10528
The mutex is used in sem_open() and sem_close(), which cannot
recurse. The atfork handlers cannot collide with the open and close
code.
Reviewed by: vangyzen
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D10545
Do not retest for the found semaphore after the loop to look it up.
Instead, handle both cases of last and non-last close simultaneously,
which allows to consolidate the list unlock and successful return.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
The H_SET operation of the history() function takes an int argument which is
the position of the item to which the cursor should be moved to.
Submitted by: Abhinav Upadhyay <abhinav@NetBSD.org>
The sysctl(HW_PAGESIZE) call cannot fail on FreeBSD kernels at least.
And even if it failed for some improbable reason, PAGE_SIZE is a safe
value to return.
Discussed with: jilles
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
patm(4) devices.
Maintaining an address family and framework has real costs when we make
infrastructure improvements. In the case of NATM we support no devices
manufactured in the last 20 years and some will not even work in modern
motherboards (some newer devices that patm(4) could be updated to
support apparently exist, but we do not currently have support).
With this change, support remains for some netgraph modules that don't
require NATM support code. It is unclear if all these should remain,
though ng_atmllc certainly stands alone.
Note well: FreeBSD 11 supports NATM and will continue to do so until at
least September 30, 2021. Improvements to the code in FreeBSD 11 are
certainly welcome.
Reviewed by: philip
Approved by: harti
The internal array size goes through a loop and is compared with numitems
which at its limits makes can be unreachably higher than arraysz.
Prevent an hypothetical overflow by matching the types.
MFC after: 1 week
Taking some hints from the regex variant in nvi(1) and higher-level
compiler warnings, update some types in our regex(3) implementation.
Joint work with: Kyle Evans
MFC after: 2 weeks
