linux-kernel - Re: [RFC PATCH v1 1/2] capability: Add cap

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Date:   Mon, 27 Dec 2021 14:26:29 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Francis Laniel <flaniel@...ux.microsoft.com>,
        linux-kernel@...r.kernel.org
Cc:     Serge Hallyn <serge@...lyn.com>,
        linux-security-module@...r.kernel.org,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [RFC PATCH v1 1/2] capability: Add cap_strings.

On 12/27/2021 12:54 PM, Francis Laniel wrote:
> This array contains the capability names for the given capabilitiy.
> For example, index CAP_BPF contains "CAP_BPF".
>
> Signed-off-by: Francis Laniel <flaniel@...ux.microsoft.com>
> ---
>   include/uapi/linux/capability.h |  1 +
>   kernel/capability.c             | 45 +++++++++++++++++++++++++++++++++
>   2 files changed, 46 insertions(+)
>
> diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h
> index 463d1ba2232a..9646654d5111 100644
> --- a/include/uapi/linux/capability.h
> +++ b/include/uapi/linux/capability.h
> @@ -428,5 +428,6 @@ struct vfs_ns_cap_data {
>   #define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
>   #define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */
>   
> +extern const char *cap_strings[];
>   
>   #endif /* _UAPI_LINUX_CAPABILITY_H */
> diff --git a/kernel/capability.c b/kernel/capability.c
> index 46a361dde042..5a2e71dcd87b 100644
> --- a/kernel/capability.c
> +++ b/kernel/capability.c
> @@ -15,6 +15,7 @@
>   #include <linux/mm.h>
>   #include <linux/export.h>
>   #include <linux/security.h>
> +#include <linux/stringify.h>
>   #include <linux/syscalls.h>
>   #include <linux/pid_namespace.h>
>   #include <linux/user_namespace.h>
> @@ -27,6 +28,50 @@
>   const kernel_cap_t __cap_empty_set = CAP_EMPTY_SET;
>   EXPORT_SYMBOL(__cap_empty_set);
>   
> +const char *cap_strings[] = {
> +	[CAP_CHOWN] = __stringify_1(CAP_CHOWN),

I may just be old and slow, but why is this better than

	[CAP_CHOWN] = "CAP_CHOWN",

> +	[CAP_DAC_OVERRIDE] = __stringify_1(CAP_DAC_OVERRIDE),
> +	[CAP_DAC_READ_SEARCH] = __stringify_1(CAP_DAC_READ_SEARCH),
> +	[CAP_FOWNER] = __stringify_1(CAP_FOWNER),
> +	[CAP_FSETID] = __stringify_1(CAP_FSETID),
> +	[CAP_KILL] = __stringify_1(CAP_KILL),
> +	[CAP_SETGID] = __stringify_1(CAP_SETGID),
> +	[CAP_SETUID] = __stringify_1(CAP_SETUID),
> +	[CAP_SETPCAP] = __stringify_1(CAP_SETPCAP),
> +	[CAP_LINUX_IMMUTABLE] = __stringify_1(CAP_LINUX_IMMUTABLE),
> +	[CAP_NET_BIND_SERVICE] = __stringify_1(CAP_NET_BIND_SERVICE),
> +	[CAP_NET_BROADCAST] = __stringify_1(CAP_NET_BROADCAST),
> +	[CAP_NET_ADMIN] = __stringify_1(CAP_NET_ADMIN),
> +	[CAP_NET_RAW] = __stringify_1(CAP_NET_RAW),
> +	[CAP_IPC_LOCK] = __stringify_1(CAP_IPC_LOCK),
> +	[CAP_IPC_OWNER] = __stringify_1(CAP_IPC_OWNER),
> +	[CAP_SYS_MODULE] = __stringify_1(CAP_SYS_MODULE),
> +	[CAP_SYS_RAWIO] = __stringify_1(CAP_SYS_RAWIO),
> +	[CAP_SYS_CHROOT] = __stringify_1(CAP_SYS_CHROOT),
> +	[CAP_SYS_PTRACE] = __stringify_1(CAP_SYS_PTRACE),
> +	[CAP_SYS_PACCT] = __stringify_1(CAP_SYS_PACCT),
> +	[CAP_SYS_ADMIN] = __stringify_1(CAP_SYS_ADMIN),
> +	[CAP_SYS_BOOT] = __stringify_1(CAP_SYS_BOOT),
> +	[CAP_SYS_NICE] = __stringify_1(CAP_SYS_NICE),
> +	[CAP_SYS_RESOURCE] = __stringify_1(CAP_SYS_RESOURCE),
> +	[CAP_SYS_TIME] = __stringify_1(CAP_SYS_TIME),
> +	[CAP_SYS_TTY_CONFIG] = __stringify_1(CAP_SYS_TTY_CONFIG),
> +	[CAP_MKNOD] = __stringify_1(CAP_MKNOD),
> +	[CAP_LEASE] = __stringify_1(CAP_LEASE),
> +	[CAP_AUDIT_WRITE] = __stringify_1(CAP_AUDIT_WRITE),
> +	[CAP_AUDIT_CONTROL] = __stringify_1(CAP_AUDIT_CONTROL),
> +	[CAP_SETFCAP] = __stringify_1(CAP_SETFCAP),
> +	[CAP_MAC_OVERRIDE] = __stringify_1(CAP_MAC_OVERRIDE),
> +	[CAP_MAC_ADMIN] = __stringify_1(CAP_MAC_ADMIN),
> +	[CAP_SYSLOG] = __stringify_1(CAP_SYSLOG),
> +	[CAP_WAKE_ALARM] = __stringify_1(CAP_WAKE_ALARM),
> +	[CAP_BLOCK_SUSPEND] = __stringify_1(CAP_BLOCK_SUSPEND),
> +	[CAP_AUDIT_READ] = __stringify_1(CAP_AUDIT_READ),
> +	[CAP_PERFMON] = __stringify_1(CAP_PERFMON),
> +	[CAP_BPF] = __stringify_1(CAP_BPF),
> +	[CAP_CHECKPOINT_RESTORE] = __stringify_1(CAP_CHECKPOINT_RESTORE),
> +};
> +
>   int file_caps_enabled = 1;
>   
>   static int __init file_caps_disable(char *str)