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mruby-socket: range-check an Integer before narrowing it to a C int - #7739
Same as #7713, for mruby-socket. setsockopt and getsockopt cast level and optname with (int), and the same cast sits on the flags of send, recv and recvfrom, shutdown's how, Addrinfo#getnameinfo's flags, Socket::Option.int's value and the arguments of Socket._socket, _bind, _connect, _listen and _accept. On a 64-bit mrb_int, s.setsockopt((1 << 32) + Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true) set the option on SOL_SOCKET.
These now raise RangeError, as the getaddrinfo hints do. setsockopt also packed an Integer or true/false optval as an mrb_int, which the OS reads as an int; on a big-endian host that is the upper half. It now packs an int.
Summary by CodeRabbit
Bug Fixes
Socket operations now reject integer arguments that exceed the supported range with a RangeError, rather than silently narrowing them. This applies to socket options, sending and receiving data, shutdown, socket creation, file descriptors, and address information.
Ordinary socket-option values continue to work, and a socket can still receive queued data after an oversized receive flag is rejected.
setsockopt and getsockopt cast level and optname with (int), and the same cast
sits on the flags of send, recv and recvfrom, on shutdown's how, on
Addrinfo#getnameinfo's flags, on Socket::Option.int's value and on the
arguments of Socket._socket, _bind, _connect, _listen and _accept. On a 64-bit
mrb_int, s.setsockopt((1 << 32) + Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true)
set the option on SOL_SOCKET, and s.send("x", (1 << 32) + 1) sent with flags 1.
Raise RangeError instead, as mruby#7713 and the getaddrinfo hints do, and as CRuby
does for these values.
setsockopt also packed an Integer or true/false optval as an mrb_int. The OS
reads an int from it, which on a big-endian host is the upper half, so these
options were set to 0. Pack an int.
Socket integer arguments now use a range-checking conversion before conversion to C int. Tests cover oversized values across socket APIs and verify ordinary socket-option behavior.
A helper checks whether mrb_int values fit in C int when mrb_int is wider. Socket-option encoding and level and option arguments use this helper. Tests cover oversized values and ordinary boolean socket-option round-trips.
Socket data and shutdown arguments mrbgems/mruby-socket/src/socket.c, mrbgems/mruby-socket/test/basicsocket.rb
Receive, send, and shutdown arguments use checked conversions. Tests cover oversized flags and confirm queued data can be read after an oversized receive flag is rejected.
Socket creation and descriptor arguments mrbgems/mruby-socket/src/socket.c, mrbgems/mruby-socket/test/basicsocket.rb
Socket creation, descriptor operations, and address-info flags use checked conversions. Tests cover oversized arguments to these APIs.
Oversized socket-option values produce the wrong exception on supported Bigint builds, and the new test fails there. Correct the integer dispatch before merging.
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The title names the main change: mruby-socket now range-checks Integer arguments before narrowing them to a C int, raising RangeError for out-of-range values. The raw summary and PR objectives both de…
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The title names the main change: mruby-socket now range-checks Integer arguments before narrowing them to a C int, raising RangeError for out-of-range values. The raw summary and PR objectives both describe this change, including socket_int, the RangeError behavior, and the setsockopt int packing. The title is concise, specific, and free of file lists or vague terms.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @mrbgems/mruby-socket/src/socket.c:
- Line 837: Update the optval integer branch in setsockopt to accept Bignum
values as well as values recognized by mrb_integer_p. Check that the value fits
in C int before passing it to socket_int, and raise RangeError when it is out of
range.
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mrbgems/mruby-socket/src/socket.c
mrbgems/mruby-socket/test/basicsocket.rb
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Major · Functional Correctness · Quick win
Accept Bignum option values before checking their range.
On a 32-bit mrb_int build with MRB_USE_BIGINT, 1 << 32 is a Bignum. The existing mrb_integer_p(optval) condition rejects that value before the new socket_int call at Line 843. setsockopt therefore raises ArgumentError, not the RangeError required by the new test at mrbgems/mruby-socket/test/basicsocket.rb Line 49. Include Bignums in the integer branch and reject values outside C int before encoding them. (raw.githubusercontent.com)
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Review comment at @mrbgems/mruby-socket/src/socket.c at line 837:
Update the optval integer branch in setsockopt to accept Bignum values as well
as values recognized by mrb_integer_p. Check that the value fits in C int before
passing it to socket_int, and raise RangeError when it is out of range.
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Same as #7713, for mruby-socket.
setsockoptandgetsockoptcastlevelandoptnamewith(int), and the same cast sits on the flags ofsend,recvandrecvfrom,shutdown's how,Addrinfo#getnameinfo's flags,Socket::Option.int's value and the arguments ofSocket._socket,_bind,_connect,_listenand_accept. On a 64-bit mrb_int,s.setsockopt((1 << 32) + Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true)set the option on SOL_SOCKET.These now raise RangeError, as the getaddrinfo hints do.
setsockoptalso packed an Integer or true/false optval as an mrb_int, which the OS reads as an int; on a big-endian host that is the upper half. It now packs an int.Summary by CodeRabbit
RangeError, rather than silently narrowing them. This applies to socket options, sending and receiving data, shutdown, socket creation, file descriptors, and address information.