Re: [LTP] [PATCH V2] userns01: add capability verification

[Jan Stancek <jstancek@redhat.com>]

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On Fri, Jul 03, 2015 at 05:13:37PM +0800, Yuan Sun wrote:
> Hi Jan,
>     The following link is unaccessible because HuaWei's network
> security strategy.
>     Could you please attach the test.c file for me?
> http://fpaste.org/239445/35909330/

Was afraid my web email client would mangle it. Attached.

Regards,
Jan


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#include <linux/types.h>
#include <sys/capability.h>
#include <stdio.h>

#define NUMBER_OF_CAP_SETS      3
#if defined(_LINUX_CAPABILITY_VERSION_3)
# if (_LINUX_CAPABILITY_VERSION_3 != 0x20080522)
#  error Kernel <linux/capability.h> v3 does not match library
#  error file "libcap.h" --> fix and recompile libcap
# else
#  define _LIBCAP_CAPABILITY_VERSION  _LINUX_CAPABILITY_VERSION_3
#  define _LIBCAP_CAPABILITY_U32S     _LINUX_CAPABILITY_U32S_3
# endif
#endif

struct _cap_struct {
    struct __user_cap_header_struct head;
    union {
        struct __user_cap_data_struct set;
        __u32 flat[NUMBER_OF_CAP_SETS];
    } u[_LIBCAP_CAPABILITY_U32S];
};

int main(void)
{
	
	cap_t caps, expectedcaps;
	int i;

	caps = cap_get_proc();
	expectedcaps = cap_from_text("=ep");
	
	for (i = 0; i < _LIBCAP_CAPABILITY_U32S; i++)
		printf("%08x ", caps->u[i].flat[CAP_EFFECTIVE]);
	printf("\n");

	for (i = 0; i < _LIBCAP_CAPABILITY_U32S; i++)
		printf("%08x ", expectedcaps->u[i].flat[CAP_EFFECTIVE]);
	printf("\n");

	printf("cap_compare: %d\n", cap_compare(caps, expectedcaps));

	return 0;
}

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