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syscall: add memfd_create() (v3)

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v2: Follow the kerndat style that "features" are described
just by global boolean variables.

v3: give NULL as a name to get EFAULT if memfd_create is supported
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2014-10-14 13:10:53 +04:00 • committed by Pavel Emelyanov
parent caa64d974d
commit de71c48079
4 changed files with 26 additions and 0 deletions
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1
arch/arm/syscall.def
View file

@ -96,3 +96,4 @@ kcmp 272 378 (pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned
openat 56 322 (int dirfd, const char *pathname, int flags, mode_t mode)
mkdirat 34 323 (int dirfd, const char *pathname, mode_t mode)
unlinkat 35 328 (int dirfd, const char *pathname, int flags)
memfd_create 279 385 (const char *name, unsigned int flags)

1
arch/x86/syscall-x86-64.def
View file

@ -96,3 +96,4 @@ __NR_prlimit64 302 sys_prlimit64 (pid_t pid, unsigned int resource, const str
__NR_open_by_handle_at 304 sys_open_by_handle_at (int mountdirfd, struct file_handle *handle, int flags)
__NR_setns 308 sys_setns (int fd, int nstype)
__NR_kcmp 312 sys_kcmp (pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2)
__NR_memfd_create 319 sys_memfd_create (const char *name, unsigned int flags)

2
include/kerndat.h
View file

@ -24,4 +24,6 @@ extern u64 zero_page_pfn;
struct stat;
extern struct stat *kerndat_get_devpts_stat(void);
extern bool memfd_is_supported;
#endif /* __CR_KERNDAT_H__ */

22
kerndat.c
View file

@ -13,6 +13,7 @@
#include "mem.h"
#include "compiler.h"
#include "sysctl.h"
#include "syscall.h"
#include "asm/types.h"
#include "cr_options.h"
#include "util.h"
@ -220,6 +221,25 @@ int get_last_cap(void)
return sysctl_op(req, CTL_READ);
}
bool memfd_is_supported;
static bool kerndat_has_memfd_create(void)
{
int ret;
ret = sys_memfd_create(NULL, 0);
if (ret == -ENOSYS)
memfd_is_supported = false;
else if (ret == -EFAULT)
memfd_is_supported = true;
else {
pr_err("Unexpected error %d from memfd_create(NULL, 0)\n", ret);
return -1;
}
return 0;
}
int kerndat_init(void)
{
int ret;
@ -231,6 +251,8 @@ int kerndat_init(void)
ret = init_zero_page_pfn();
if (!ret)
ret = get_last_cap();
if (!ret)
ret = kerndat_has_memfd_create();
return ret;
}