mm/process_vm_access.c

File Facts

System

Linux kernel

Corpus path

mm/process_vm_access.c

Extension

.c

Size

8458 bytes

Lines

306

Domain

Core OS

Bucket

Memory Management

Inferred role

Core OS: syscall or user/kernel boundary

Status

core implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/compat.h
• linux/mm.h
• linux/uio.h
• linux/sched.h
• linux/sched/mm.h
• linux/highmem.h
• linux/ptrace.h
• linux/slab.h
• linux/syscalls.h

Detected Declarations

• syscall process_vm_readv
• syscall process_vm_writev
• function Copyright
• function process_vm_rw_single_vec
• function process_vm_rw_core
• function process_vm_rw

Annotated Snippet

SYSCALL_DEFINE6(process_vm_readv, pid_t, pid, const struct iovec __user *, lvec,
		unsigned long, liovcnt, const struct iovec __user *, rvec,
		unsigned long, riovcnt,	unsigned long, flags)
{
	return process_vm_rw(pid, lvec, liovcnt, rvec, riovcnt, flags, 0);
}

SYSCALL_DEFINE6(process_vm_writev, pid_t, pid,
		const struct iovec __user *, lvec,
		unsigned long, liovcnt, const struct iovec __user *, rvec,
		unsigned long, riovcnt,	unsigned long, flags)
{
	return process_vm_rw(pid, lvec, liovcnt, rvec, riovcnt, flags, 1);
}

Annotation

• Immediate include surface: `linux/compat.h`, `linux/mm.h`, `linux/uio.h`, `linux/sched.h`, `linux/sched/mm.h`, `linux/highmem.h`, `linux/ptrace.h`, `linux/slab.h`.
• Detected declarations: `syscall process_vm_readv`, `syscall process_vm_writev`, `function Copyright`, `function process_vm_rw_single_vec`, `function process_vm_rw_core`, `function process_vm_rw`.
• Atlas domain: Core OS / Memory Management.
• Implementation status: core implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.