Add support for legacy memory management syscalls

[kov]

Implements:

• memfd_create: create anonymous file in memory

• pkey_mprotect: set protection with memory protection key

• mseal: seal memory region (Linux 6.10+)

• remap_file_pages: remap file pages (deprecated)

• Add data structures for all 4 syscalls

• Add eBPF handlers in memory.rs

• Register syscalls in MEMORY_SYSCALLS

• Add format_memfd_create_flags() helper with MFD_* constants

• Add return value formatting (fd for memfd_create, success/error for others)

• Add 5 pretty printing tests

• All 540 tests passing

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adds support for four memory management syscalls: memfd_create, pkey_mprotect, mseal, and remap_file_pages. The implementation follows the established consolidated handler architecture for the memory category.

Key changes:

• Adds data structures for all four syscalls to the common library
• Implements eBPF handlers in the consolidated memory handler
• Adds comprehensive unit tests and an integration test for memfd_create

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pinchy-common/src/lib.rs	Adds data structures for the four new syscalls to SyscallEventData union
pinchy-ebpf/src/memory.rs	Implements eBPF handlers for the four syscalls in the consolidated memory handler
pinchy/src/server.rs	Registers the four syscalls in MEMORY_SYSCALLS array for loading
pinchy/src/format_helpers.rs	Adds format_memfd_create_flags(), format_mseal_flags(), and return value handling for the syscalls
pinchy/src/events.rs	Adds event parsing logic for all four syscalls with appropriate argument formatting
pinchy/src/tests/memory.rs	Adds five unit tests covering various scenarios for the new syscalls
pinchy/tests/integration.rs	Adds integration test for memfd_create with multiple flag combinations
pinchy/src/bin/test-helper.rs	Implements memfd_test() workload function to exercise memfd_create in integration tests

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