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commit 54a0b14e2d66dbc0ad4a53300b4c2294db041a6b
Author: Manolo de Medici <[email protected]>
Date: Mon Apr 6 22:04:52 2026 +0100
ipc: fix LP64 zero-length OOL port array descriptor size
ipc_kmsg_copyin_body() updated OOL port arrays from 32-bit
mach_port_name_t elements to 64-bit mach_port_t elements only in the
non-empty path. For zero-length arrays, the code skipped that
normalization and left msgtl_size at 32.
On LP64 this causes MIG type checking to reject empty OOL port arrays,
because the kernel delivers MACH_MSG_TYPE_PORT_SEND with msgtl_size == 32
instead of 64. Apparently, those kind of messages are never delivered on
the current Hurd, as such, the bug went unnoticed.
Normalize the descriptor size for OOL port arrays before the length == 0
branch so empty and non-empty arrays are handled consistently.
Message-ID: <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
ipc/ipc_kmsg.c | 59 ++++++++++++++++++++++++++++++++--------------------------
1 file changed, 33 insertions(+), 26 deletions(-)
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