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perf cap: Add __NR_capget to arch/x86 unistd

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As there are duplicated kernel headers in tools/include libc can pick
up the wrong definitions. This was causing the wrong system call for
capget in perf.

Reported-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: e25ebda78e ("perf cap: Tidy up and improve capability testing")
Closes: https://lore.kernel.org/lkml/cc7d6bdf-1aeb-4179-9029-4baf50b59342@intel.com/
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241026055448.312247-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2024-10-25 22:54:48 -07:00 committed by Arnaldo Carvalho de Melo
parent 55f1b540d8
commit a5384c4267
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/arch/x86/include/uapi/asm/unistd_32.h
View File

@ -11,6 +11,9 @@
#ifndef __NR_getpgid
#define __NR_getpgid 132
#endif
#ifndef __NR_capget
#define __NR_capget 184
#endif
#ifndef __NR_gettid
#define __NR_gettid 224
#endif

3
tools/arch/x86/include/uapi/asm/unistd_64.h
View File

@ -11,6 +11,9 @@
#ifndef __NR_getpgid
#define __NR_getpgid 121
#endif
#ifndef __NR_capget
#define __NR_capget 125
#endif
#ifndef __NR_gettid
#define __NR_gettid 186
#endif

10
tools/perf/util/cap.c
View File

@ -7,13 +7,9 @@
#include "debug.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <linux/capability.h>
#include <sys/syscall.h>
#ifndef SYS_capget
#define SYS_capget 90
#endif
#include <unistd.h>
#define MAX_LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_3
@ -21,9 +17,9 @@ bool perf_cap__capable(int cap, bool *used_root)
{
struct __user_cap_header_struct header = {
.version = _LINUX_CAPABILITY_VERSION_3,
.pid = getpid(),
.pid = 0,
};
struct __user_cap_data_struct data[MAX_LINUX_CAPABILITY_U32S];
struct __user_cap_data_struct data[MAX_LINUX_CAPABILITY_U32S] = {};
__u32 cap_val;
*used_root = false;