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SubjectRe: [RFC PATCH v3 2/2] security/inode.c: Add capabilities file.
Date
Hi.

Le jeudi 20 janvier 2022, 19:01:16 CET Francis Laniel a écrit :
> This new read-only file prints the capabilities values with their names:
> cat /sys/kernel/security/capabilities
> 0 CAP_CHOWN
> 1 CAP_DAC_OVERRIDE
> ...
> 40 CAP_CHECKPOINT_RESTORE
>
> Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
> ---
> security/inode.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/security/inode.c b/security/inode.c
> index 6c326939750d..cef78b497bab 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -21,6 +21,7 @@
> #include <linux/security.h>
> #include <linux/lsm_hooks.h>
> #include <linux/magic.h>
> +#include <linux/capability.h>
>
> static struct vfsmount *mount;
> static int mount_count;
> @@ -328,6 +329,19 @@ static const struct file_operations lsm_ops = {
> };
> #endif
>
> +static struct dentry *capabilities_dentry;
> +static ssize_t capabilities_read(struct file *unused, char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + return simple_read_from_buffer(buf, count, ppos, cap_string,
> + strlen(cap_string));
> +}
> +
> +static const struct file_operations capabilities_ops = {
> + .read = capabilities_read,
> + .llseek = generic_file_llseek,
> +};
> +
> static int __init securityfs_init(void)
> {
> int retval;
> @@ -345,6 +359,8 @@ static int __init securityfs_init(void)
> lsm_dentry = securityfs_create_file("lsm", 0444, NULL, NULL,
> &lsm_ops);
> #endif
> + capabilities_dentry = securityfs("capabilities", 0444, NULL, NULL,
> + capabilities_ops);

Sorry, I sent the old version of the patch and did not fixup this...
Kernel robot kindly show me this error.
I swear the output in the cover letter was done on the compiled kernel within
a VM.

I will send a v4 correcting this but I will wait to get some reviews on v3 to
not send to not generate too much traffic here.

> return 0;
> }
> core_initcall(securityfs_init);

Best regards.


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