[30.x] Backports #34689

1. 
   fanquake commented at 12:05 pm on February 27, 2026: member

   Backports:

   • #34093
   • #34219
   • #34597
   • #34690
   • #34702
   • #34706
   • #34713
2. util: Fix UB in SetStdinEcho when ENOTTY

   Github-Pull: #34597
   Rebased-From: fa692974ac2d69e01091f03625cd8a227e310065

   24fcbe18e3
3. refactor: Use static_cast<decltype(...)> to suppress integer sanitizer warning

   This refactor does not change any behavior, except for the integer
   sanitizer warning.
   
   Can be tested via:
   
   UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./bld-cmake/bin/bitcoin-cli -stdinrpcpass uptime
   
   Github-Pull: #34597
   Rebased-From: fa6af856341384e4a84c5674e66fe7c1f13dd73c

   88e071667b
4. netif: fix compilation warning in QueryDefaultGatewayImpl()

   ```
   src/common/netif.cpp:137:51: error: comparison of integers of different signs: 'int64_t' (aka 'long') and 'unsigned long' [-Werror,-Wsign-compare]
     137 |         for (nlmsghdr* hdr = (nlmsghdr*)response; NLMSG_OK(hdr, recv_result); hdr = NLMSG_NEXT(hdr, recv_result)) {
         |                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
   /usr/include/netlink/netlink.h:220:31: note: expanded from macro 'NLMSG_OK'
     220 | #define NLMSG_OK(_hdr, _len)            NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN)
         |                                         ^                ~~~~  ~~~~~~~~~~~~
   /usr/include/netlink/netlink.h:203:10: note: expanded from macro 'NL_ITEM_OK'
     203 |         ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len))
         |           ~~~~  ^  ~~~~~
   1 error generated.
   ```
   
   Happens on FreeBSD 15.0, with the default compiler (Clang 19).
   
   On FreeBSD 14, `/usr/include/netlink/netlink.h` contains:
   ```
    #define NLMSG_HDRLEN                    ((int)sizeof(struct nlmsghdr))
   ```
   
   On FreeBSD 15, `/usr/include/netlink/netlink.h` contains:
   ```
    #define NLMSG_HDRLEN                    (sizeof(struct nlmsghdr))
   ```
   
   Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
   
   Github-Pull: #34093
   Rebased-From: c1361fc42dd60606fcd6273cede1083cd88866a2

   a09b4cc12a
5. fanquake added this to the milestone 30.3 on Feb 27, 2026
6. DrahtBot added the label Backport on Feb 27, 2026
7. 
   DrahtBot commented at 12:05 pm on February 27, 2026: contributor

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8. test: Add missing timeout_factor to zmq socket

   Github-Pull: #34690
   Rebased-From: fa48f8c8655d93e78b32b560a870577909b666d3

   22cc95584e
9. fanquake force-pushed on Mar 2, 2026
10. doc: Improve dependencies.md IPC documentation

    Improve dependencies.md to document IPC dependencies better:
    
    - Link to native_capnp.mk file not capnp.mk file so it's possible to see what
      version of Cap'n Proto is being used in release binaries. This is important
      since #31895 dropped the "Version Used" column and the capnp.mk file does not
      include version number.
    - Indicate Capn"Proto is used for IPC and link to multiprocess.md documenting
      the feature.
    - Link to correct PR requiring Cap'n Proto 0.7.1. Previous link was
      pointing at PR which required 0.7.0.
    - Mention libmultiprocess as a dependency even though it is included as a git
      subtree and can be built as a cmake subproject. Libmultiprocess still needs
      to be built separately when cross compiling, and is useful to build separately
      when developing, and is still a depends package.
    
    Based on 2cf352fd8e6a77003e38d954b6c879b20d4b960a from #33623 by willcl-ark
    which made similar changes in the 29.x branch.
    
    Github-Pull: #34706
    Rebased-From: b87a1c27c99821cea995112114eb40afa93417f2

    532f76cf4e
11. fanquake force-pushed on Mar 4, 2026
12. psbt: validate pubkeys in MuSig2 pubnonce/partial sig deserialization

    Add validation for pubkeys in MuSig2 pubnonce and partial signature deserialization to prevent crashes with invalid curve points.
    
    - Validate aggregate and participant pubkeys in PSBT MuSig2 fields
    
    - Add comprehensive test coverage for invalid pubkey rejection
    
    - Ensure proper error handling during PSBT deserialization
    
    Github-Pull: #34219
    Rebased-From: f51665bee72c26d3f3cc6813b6c02adad5f0af6a

    2cfbfb668c
13. fanquake force-pushed on Mar 4, 2026
14. depends: Allow building Qt packages after interruption

    Github-Pull: #34713
    Rebased-From: 2a7a4f608a42acef5cdf7370f0d191119fdb94c9

    330a804432
15. fanquake force-pushed on Mar 5, 2026
16. doc: Fix `fee` field in `getblock` RPC result

    The `fee` field in the `getblock` RPC result (verbosity 2 and 3) may be
    omitted when block undo data is not available. Marking it optional in
    the `RPCResult` aligns the documented schema with the runtime behavior.
    
    Github-Pull: #34702
    Rebased-From: f580cc7e9f26331f7f03a8bbc5722521eb159bb2

    83ee4e5aa8
17. doc: update release notes for v30.x e99c9257dd
18. fanquake force-pushed on Mar 8, 2026

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fanquake DrahtBot

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Backport

Milestone
30.3