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linux(4): Implement faccessat2 system call.

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It's used by bash on arm64 with glibc-2.32.

Reviewed by:		trasz
Differential Revision:	https://reviews.freebsd.org/D31345
MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2021-08-12 11:40:42 +03:00
parent 6e31bed646
commit 13d79be995
5 changed files with 62 additions and 11 deletions
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7
sys/amd64/linux/syscalls.master
View File

@ -2094,7 +2094,12 @@
int linux_pidfd_getfd(void);
}
439 AUE_NULL STD {
int linux_faccessat2(void);
int linux_faccessat2(
l_int dfd,
const char *filename,
l_int amode,
l_int flags
);
}
440 AUE_NULL STD {
int linux_process_madvise(void);

7
sys/amd64/linux32/syscalls.master
View File

@ -2496,7 +2496,12 @@
int linux_pidfd_getfd(void);
}
439 AUE_NULL STD {
int linux_faccessat2(void);
int linux_faccessat2(
l_int dfd,
const char *filename,
l_int amode,
l_int flags
);
}
440 AUE_NULL STD {
int linux_process_madvise(void);

7
sys/arm64/linux/syscalls.master
View File

@ -1743,7 +1743,12 @@
int linux_pidfd_getfd(void);
}
439 AUE_NULL STD {
int linux_faccessat2(void);
int linux_faccessat2(
l_int dfd,
const char *filename,
l_int amode,
l_int flags
);
}
440 AUE_NULL STD {
int linux_process_madvise(void);

45
sys/compat/linux/linux_file.c
View File

@ -70,6 +70,7 @@ __FBSDID("$FreeBSD$");
static int linux_common_open(struct thread *, int, const char *, int, int,
enum uio_seg);
static int linux_do_accessat(struct thread *t, int, const char *, int, int);
static int linux_getdents_error(struct thread *, int, int);
static struct bsd_to_linux_bitmap seal_bitmap[] = {
@ -675,28 +676,58 @@ linux_access(struct thread *td, struct linux_access_args *args)
}
#endif
int
linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
static int
linux_do_accessat(struct thread *td, int ldfd, const char *filename,
int amode, int flags)
{
char *path;
int error, dfd;
/* Linux convention. */
if (args->amode & ~(F_OK | X_OK | W_OK | R_OK))
if (amode & ~(F_OK | X_OK | W_OK | R_OK))
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
dfd = (ldfd == LINUX_AT_FDCWD) ? AT_FDCWD : ldfd;
if (!LUSECONVPATH(td)) {
error = kern_accessat(td, dfd, args->filename, UIO_USERSPACE, 0, args->amode);
error = kern_accessat(td, dfd, filename, UIO_USERSPACE, flags, amode);
} else {
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0, args->amode);
LCONVPATHEXIST_AT(td, filename, &path, dfd);
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, flags, amode);
LFREEPATH(path);
}
return (error);
}
int
linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
{
return (linux_do_accessat(td, args->dfd, args->filename, args->amode,
0));
}
int
linux_faccessat2(struct thread *td, struct linux_faccessat2_args *args)
{
int flags, unsupported;
/* XXX. AT_SYMLINK_NOFOLLOW is not supported by kern_accessat */
unsupported = args->flags & ~(LINUX_AT_EACCESS | LINUX_AT_EMPTY_PATH);
if (unsupported != 0) {
linux_msg(td, "faccessat2 unsupported flag 0x%x", unsupported);
return (EINVAL);
}
flags = (args->flags & LINUX_AT_EACCESS) == 0 ? 0 :
AT_EACCESS;
flags |= (args->flags & LINUX_AT_EMPTY_PATH) == 0 ? 0 :
AT_EMPTY_PATH;
return (linux_do_accessat(td, args->dfd, args->filename, args->amode,
flags));
}
#ifdef LINUX_LEGACY_SYSCALLS
int
linux_unlink(struct thread *td, struct linux_unlink_args *args)

7
sys/i386/linux/syscalls.master
View File

@ -2514,7 +2514,12 @@
int linux_pidfd_getfd(void);
}
439 AUE_NULL STD {
int linux_faccessat2(void);
int linux_faccessat2(
l_int dfd,
const char *filename,
l_int amode,
l_int flags
);
}
440 AUE_NULL STD {
int linux_process_madvise(void);