crypto/jitterentropy-testing.c

File Facts

System

Linux kernel

Corpus path

crypto/jitterentropy-testing.c

Extension

.c

Size

7186 bytes

Lines

296

Domain

Kernel Services

Bucket

crypto

Inferred role

Kernel Services: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/debugfs.h
• linux/module.h
• linux/uaccess.h
• jitterentropy.h

Detected Declarations

• struct jent_testing
• function jent_testing_reset
• function jent_testing_data_init
• function jent_testing_fini
• function jent_testing_store
• function jent_testing_have_data
• function jent_testing_reader
• function jent_testing_extract_user
• function jent_raw_hires_entropy_store
• function jent_raw_hires_entropy_reader
• function jent_raw_hires_read
• function jent_testing_init
• function jent_testing_exit
• export jent_raw_hires_entropy_store
• export jent_testing_init
• export jent_testing_exit

Annotated Snippet

static const struct file_operations jent_raw_hires_fops = {
	.owner = THIS_MODULE,
	.read = jent_raw_hires_read,
};

/******************************* Initialization *******************************/

void jent_testing_init(void)
{
	jent_raw_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);

	debugfs_create_file_unsafe("jent_raw_hires", 0400,
				   jent_raw_debugfs_root, NULL,
				   &jent_raw_hires_fops);
}
EXPORT_SYMBOL(jent_testing_init);

void jent_testing_exit(void)
{
	debugfs_remove_recursive(jent_raw_debugfs_root);
}
EXPORT_SYMBOL(jent_testing_exit);

Annotation

• Immediate include surface: `linux/debugfs.h`, `linux/module.h`, `linux/uaccess.h`, `jitterentropy.h`.
• Detected declarations: `struct jent_testing`, `function jent_testing_reset`, `function jent_testing_data_init`, `function jent_testing_fini`, `function jent_testing_store`, `function jent_testing_have_data`, `function jent_testing_reader`, `function jent_testing_extract_user`, `function jent_raw_hires_entropy_store`, `function jent_raw_hires_entropy_reader`.
• Atlas domain: Kernel Services / crypto.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.