[PATCH v4 0/3] arm64: Add audit support

From: AKASHI Takahiro
Date: Fri Feb 07 2014 - 05:10:43 EST


This patchset adds system call audit support on arm64.
Both 32-bit (AUDIT_ARCH_ARM) and 64-bit tasks (AUDIT_ARCH_AARCH64)
are supported. Since arm64 has the exact same set of system calls
on LE and BE, we don't care about endianness (or more specifically
__AUDIT_ARCH_64BIT bit in AUDIT_ARCH_*).

There are some prerequisites for this patch to work correctly:
* "generic compat system call audit support" patch
* "correct a type mismatch in audit_syscall_exit()" patch
(already accepted and queued in 3.14)
* "Modify a set of system calls in audit class" patch
(already accepted and queued in 3.14)
* "__NR_* definitions for compat syscalls" patch from Catalin
* "make a single hook to syscall_trace() for all syscall features" patch
* userspace audit tool (v2.3.2 + my patch for arm64)

Please review them as well for better understandings.

This code was tested on both 32-bit and 64-bit LE userland
in the following two ways:
1) basic operations with auditctl/autrace
# auditctl -a exit,always -S openat -F path=/etc/inittab
# auditctl -a exit,always -F dir=/tmp -F perm=rw
# auditctl -a task,always
# autrace /bin/ls
by comparing output from autrace with one from strace

2) audit-test-code (+ my workarounds for arm/arm64)
by running "audit-tool", "filter" and "syscalls" test categories.

Changes v1 -> v2:
* Modified to utilize "generic compat system call audit" [3/6, 4/6, 5/6]
Please note that a required header, unistd_32.h, is automatically
generated from unistd32.h.
* Refer to regs->orig_x0 instead of regs->x0 as the first argument of
system call in audit_syscall_entry() [6/6]
* Include "Add regs_return_value() in syscall.h" patch [2/6],
which was not intentionally included in v1 because it could be added
by "kprobes support".

Changes v2 -> v3:
* Remove asm/audit.h.
See "generic compat syscall audit support" patch v4
* Remove endianness dependency, ie. AUDIT_ARCH_ARMEB/AARCH64EB.
* Remove kernel/syscalls/Makefile which was used to create unistd32.h.
See Catalin's "Add __NR_* definitions for compat syscalls" patch

Changes v3 -> v4:
* Modified to sync with the patch, "make a single hook to syscall_trace()
for all syscall features"


AKASHI Takahiro (3):
arm64: Add regs_return_value() in syscall.h
arm64: Add audit support
arm64: audit: Add audit hook in ptrace/syscall_trace

arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/ptrace.h | 5 +++++
arch/arm64/include/asm/syscall.h | 15 +++++++++++++++
arch/arm64/kernel/ptrace.c | 7 +++++++
include/uapi/linux/audit.h | 1 +
5 files changed, 29 insertions(+)

--
1.7.9.5

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