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nuttx/include/nuttx
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Justin Hammond cda33ae4fc libs/libc/netdb: Size an answer header by its header, not by its union. 
dns_recv_response() checked for room using sizeof(struct dns_answer_s),
but that structure is the 10-byte header plus a union holding the largest
address it can carry.  With IPv6 built the union is 16 bytes, so the check
demanded 26 bytes where 10 were needed, and any answer sitting at the end
of a response was rejected as truncated.

An A record answer supplies 14 bytes, so whether a lookup worked depended
on how much padding the server happened to send after it:

  $ dig +noedns @10.1.1.2 github.com A      # ANSWER 1, AUTHORITY 0, ADDITIONAL 0
  -> answer is last in the packet, 14 bytes remain, rejected

  $ dig +noedns @10.11.5.254 github.com A   # ANSWER 1, AUTHORITY 13, ADDITIONAL 7
  -> 26+ bytes remain, accepted

On the board, before and after, against the first of those servers:

  nsh> nslookup apache.org
  [CPU1] dns_recv_response: DNS answer header truncated
  Host: apache.org Addr: 2a04:4e42::644                 <- A record lost

  nsh> nslookup apache.org
  Host: apache.org Addr: 2a04:4e42::644
  Host: apache.org Addr: 151.101.2.132                  <- both returned

The address that follows the header is already bounds checked separately,
where its real length is known, so only the header check was wrong.  The
size is now a named constant next to the structure, since the rest of this
function already used the literal 10 for the same quantity.

Only IPv4-only builds escaped it, where sizeof happens to equal 14 and an
A record fits exactly.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Justin Hammond <justin@dynam.ac>
2026-08-08 15:02:15 -03:00
..
1wire 1wire: Move onewire_valid_rom to 1wire_crc.h 2026-06-26 22:50:43 +08:00
aie nuttx ai driver update 2024-10-17 22:35:40 +08:00
analog drivers/analog: add MCP445X potentiometer support 2026-08-08 18:37:08 +08:00
audio drivers/audio/i2s: Fix unsigned integers in function signatures 2026-07-05 15:06:04 +08:00
binfmt binfmt: Add a configuration flag to store the module filename 2025-11-01 22:59:47 +08:00
can sja1000: replace enter_critical_section with spinlock 2026-01-08 09:15:04 -03:00
clk drivers/clk: use uintptr_t for register addresses 2026-06-18 21:52:33 +08:00
contactless include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
coresight style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
crypto drivers/crypto: add Microchip RNG90 driver 2026-06-14 18:41:09 +08:00
dma include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
drivers serial/uart_rpmsg: add _raw version of driver 2026-02-23 09:19:57 -03:00
eeprom drivers/eeprom: add 24CW160 support 2026-08-06 12:39:36 +02:00
efuse include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
fs fs: enforce path search and unify inode permission helpers 2026-08-02 18:48:40 -03:00
himem include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
hwspinlock include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
i2c drivers/i2c: add ioexpander-based lower-half implementation for I2C bit-bang 2026-01-01 17:08:47 +08:00
i3c style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
input drivers/input: support ST7123 touchscreen controller 2026-08-06 12:42:15 +02:00
ioexpander drives/ioexpander: add support to PI4IOE IO Expander 2026-07-28 10:18:01 +08:00
lcd style: Fix "the the" typo across the codebase. 2026-03-23 11:07:49 +01:00
leds !drivers/pwm: remove PWM_MULTICHAN option 2026-05-18 11:35:25 -04:00
lib libc/dlfcn: Count opens so a library can be shared. 2026-08-04 11:12:49 -03:00
math drivers/math: use small lock to replace enter_critical_section 2026-01-08 11:17:17 +08:00
mbox include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
mm protect: move us_heap to userspace_data_s 2026-02-02 11:06:53 +08:00
modem style: fix checkpatch issues after debug.h move 2026-04-07 07:50:06 -03:00
motor style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
mtd drivers/mtd/gd25: add QSPI support 2026-06-21 09:43:29 -03:00
net libs/libc/netdb: Size an answer header by its header, not by its union. 2026-08-08 15:02:15 -03:00
note note/ram: support multiple noterams to dump data when panic occurs 2026-01-24 19:33:17 +08:00
nx nuttx/nx: compilation error occurs 2026-04-14 13:35:26 +08:00
pci drivers/pci:write legacy num to config space when enable legacy irq 2026-01-30 12:50:42 +08:00
pinctrl include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
power style: Fix "the the" typo across the codebase. 2026-03-23 11:07:49 +01:00
rc style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
regmap include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
reset style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
rf include: migrate license to ASF 2024-11-06 19:46:13 +08:00
rpmsg drivers/rpmsg: use NuttX atomic_t API instead of C11 atomics 2026-05-21 06:28:36 +08:00
rptun rptun: add configuring the stack of rptun as static 2026-01-19 14:18:27 +08:00
segger include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
sensors drivers/sensors/sensor: always report POLLIN for fetch only sensor 2026-08-05 12:50:12 +02:00
serial drivers/serial: Modify serial/pty to allow NSH/Telnet line edit 2026-07-22 22:07:18 +08:00
spi stm32h5/qspi: add QSPIMEM_QUADDATA flag for 1-1-4 transfers 2026-06-21 09:43:29 -03:00
syslog driver/ramlog: Implement the rate limiting function for ramlog driver. 2026-01-27 03:17:05 +08:00
timers drivers/watchdog: fix capture automonitor notifier context 2026-07-17 14:59:47 +08:00
usb drivers/usbhost/usbhost_cdcecm.c: Added support for Host CDC-ECM 2026-05-06 06:20:03 +08:00
usrsock include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
vhost drivers/vhost: add vhost_get_vq_buffers() to collect scatter-gather buffers 2026-02-04 02:32:02 +08:00
video video/rgbcolors: Fix RGBTO8 to use the high bits of each component. 2026-08-04 21:17:48 -03:00
virtio include/nuttx/virtio: allow common virtio helpers to be used by vhost 2026-02-04 02:32:02 +08:00
wireless wireless/lpwan: add SX1301 LoRa concentrator driver 2026-08-06 13:01:39 -03:00
.gitignore
addrenv.h addrenv: support addrenv when mpu is used 2026-01-26 16:27:19 +08:00
allsyms.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
arch.h style: Fix "the the" typo across the codebase. 2026-03-23 11:07:49 +01:00
ascii.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
atexit.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
atomic.h include/nuttx/atomic.h: fix C++ definition conflicts 2025-12-22 15:27:39 +08:00
bits.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
board.h drivers/usbhost/usbhost_enumerate.c: Allow selecting USB configuration 2026-05-06 06:20:03 +08:00
cache.h nuttx/cache.h: fix the compile warning in sim when enable OpenAMP 2025-12-31 02:36:29 +08:00
can.h drivers/can: move CAN utils to CAN common files 2025-05-14 10:30:25 -03:00
cancelpt.h sched/cancelpt: Fix MISRA C 2012 Rule 10.4 violations 2026-02-02 21:09:40 +08:00
circbuf.h lib/circbuf: add static initialize macro helper 2024-12-17 20:48:23 +08:00
clock.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
clock_notifier.h fs/timerfd: implement TFD_TIMER_CANCEL_ON_SET to detect clock changes 2026-01-30 17:20:24 +08:00
compiler.h float.h: improve long double related definitions 2026-07-02 09:02:21 -03:00
coredump.h coredump: fix issue that nvic region overlapped by board memory region 2025-01-24 09:15:56 +08:00
crc8.h libs/crc: implement AUTOSAR-compatible CRC algorithm 2026-01-30 17:32:15 +08:00
crc16.h libs/crc: implement AUTOSAR-compatible CRC algorithm 2026-01-30 17:32:15 +08:00
crc32.h libc/crc32: add IEEE-compatible crc32_ieee for Linux/zlib interop 2026-07-03 10:18:28 +08:00
crc64.h !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
debug.h include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
elf.h nuttx/elf.h: Fix build error with unknown type name 'bool'. 2024-10-15 12:35:10 +08:00
environ.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
envpath.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
ethtool.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
event.h [!] sched/event: Remove wait object dependency from event implementation 2025-10-31 19:56:32 -03:00
fdcheck.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
fdt.h qemu/armv7a: register cfi flash 2025-02-11 17:23:44 +08:00
gdbstub.h gdbstub: change send buffer to const char 2025-01-20 20:07:13 +08:00
hashtable.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
hrtimer.h sched/hrtimer: Update the comments. 2026-02-02 13:26:22 +08:00
idr.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
init.h sched: add trace points during system startup and board initialization 2026-01-27 03:18:11 +08:00
instrument.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
ipcc.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
irq.h sched/irq: Consolidate IRQ bounds checking into IRQ_TO_NDX macro 2026-01-28 13:35:30 +08:00
kmalloc.h userspace: Exclude nuttx/arch.h 2024-11-01 16:59:37 +08:00
kthread.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
lin.h LIN:adjust the LIN flag 2026-01-08 23:15:31 +08:00
lirc.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
list.h list: Fix the list conflicts. 2026-01-19 14:12:09 +08:00
list_type.h list: Fix the list conflicts. 2026-01-19 14:12:09 +08:00
macro.h macro: use portable variadic macros 2026-01-22 22:14:00 +08:00
memoryregion.h libs/misc/memoryregion: remove unused memory_region 2024-10-18 21:32:48 +08:00
mmcsd.h mmcsd:add postsleep fields for mmc_ioc_cmd 2024-10-15 02:06:00 +08:00
module.h libc/elf: rename modlib to libelf 2025-04-11 09:43:22 +08:00
mqueue.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
mutex.h sched/pthread: move pthread mutex from syscall to user-space 2026-01-22 12:40:49 -03:00
notifier.h include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
nuttx.h macro/align: Fix ALIGN_UP and ALIGN_DOWN 2025-01-11 12:13:10 +08:00
page.h style: Fix "is is" typo across the codebase. 2026-03-24 09:39:26 +08:00
panic_notifier.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
pgalloc.h mm/gran: add gran_alloc_align API 2025-05-12 15:01:37 +08:00
progmem.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
pthread.h pthread: move pthread_cond to userspace 2026-01-26 16:26:39 +08:00
queue.h include: queue.h: Make flink clear after sq_rem 2024-10-16 13:56:49 +08:00
random.h libc: Refine the arc4random_buf implementation 2024-10-26 18:04:21 -03:00
reboot_notifier.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
rwsem.h sched/sem_rw.c: Add downgrade_write API for sem_rw 2026-01-07 22:47:09 +08:00
sched.h fs/binfmt: close symlink TOCTOU and harden setuid/setgid exec hygiene 2026-08-01 15:32:03 -03:00
sched_note.h note: add NOTE_DUMP_BINARY support for binary log dumping 2026-01-27 21:56:03 +08:00
scsi.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
sdio.h arch/arm/src/stm32{h7,f7,l4}: add 4-bit wide bus support for MMC/eMMC cards 2026-07-21 08:51:38 -03:00
sdio_slave.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
semaphore.h include/nuttx/semaphore.h: parenthesize NXSEM helper args 2026-06-05 10:35:46 -04:00
seqlock.h seqlock: Fix struct name and constants. 2025-12-22 10:22:06 -03:00
signal.h sched/signal: Remove shadow definitions to reduce unnecessary API 2025-10-14 17:40:18 +08:00
spawn.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
spinlock.h sched/spinlock: Add time statistics in func enter_critical_section(). 2026-01-27 21:59:14 +08:00
spinlock_type.h seqlock: Fix struct name and constants. 2025-12-22 10:22:06 -03:00
streams.h libc/stream: Add support for lib_scanf 2025-06-20 09:48:39 +08:00
symtab.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
tee.h drivers/misc/optee: Expanded RPC support. 2025-08-06 02:29:33 +08:00
thermal.h drivers/thermal: Add support for passive trip point 2025-02-16 11:22:41 -03:00
tls.h pthread: remove tl_lock 2026-01-26 20:56:12 +08:00
trace.h trace: fix macro line continuation formatting 2026-01-25 10:45:26 -03:00
uorb.h drivers/sensors: add initial support for fixed-point data for sensors 2026-05-02 00:56:42 +08:00
userspace.h protect: move us_heap to userspace_data_s 2026-02-02 11:06:53 +08:00
vt100.h Documentation: nsh: document the top command 2026-07-11 09:15:15 -03:00
wdog.h drivers: Fix comment typos — 'Pubic' → 'Public' across drivers and headers. 2026-07-02 13:29:48 +08:00
wqueue.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
zoneinfo.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00