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linux: add sysctl compat.linux.use_emul_path

Browse Source 
This is a step towards facilitating jails with only Linux binaries.
Supporting emul_path adds path lookups which are completely spurious
if the binary at hand runs in a Linux-based root directory.

It defaults to on (== current behavior).

make -C /root/linux-5.3-rc8 -s -j 1 bzImage:

use_emul_path=1: 101.65s user 68.68s system 100% cpu 2:49.62 total
use_emul_path=0: 101.41s user 64.32s system 100% cpu 2:45.02 total
This commit is contained in:
Mateusz Guzik 2020-08-18 22:04:22 +00:00
parent d5e3895ea4
commit a125ed50a6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=364366
9 changed files with 302 additions and 152 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
sys/amd64/linux/linux_machdep.c
View File

@ -98,13 +98,17 @@ linux_execve(struct thread *td, struct linux_execve_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
LINUX_CTR(execve);
error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
args->envp);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = exec_copyin_args(&eargs, args->path, UIO_USERSPACE,
args->argp, args->envp);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
args->envp);
LFREEPATH(path);
}
if (error == 0)
error = linux_common_execve(td, &eargs);
return (error);

14
sys/arm64/linux/linux_machdep.c
View File

@ -67,11 +67,15 @@ linux_execve(struct thread *td, struct linux_execve_args *uap)
char *path;
int error;
LCONVPATHEXIST(td, uap->path, &path);
error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, uap->argp,
uap->envp);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = exec_copyin_args(&eargs, uap->path, UIO_USERSPACE,
uap->argp, uap->envp);
} else {
LCONVPATHEXIST(td, uap->path, &path);
error = exec_copyin_args(&eargs, path, UIO_SYSSPACE,
uap->argp, uap->envp);
LFREEPATH(path);
}
if (error == 0)
error = linux_common_execve(td, &eargs);
return (error);

102
sys/compat/linux/linux_file.c
View File

@ -66,7 +66,8 @@ __FBSDID("$FreeBSD$");
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_file.h>
static int linux_common_open(struct thread *, int, char *, int, int);
static int linux_common_open(struct thread *, int, const char *, int, int,
enum uio_seg);
static int linux_getdents_error(struct thread *, int, int);
static struct bsd_to_linux_bitmap seal_bitmap[] = {
@ -107,17 +108,22 @@ linux_creat(struct thread *td, struct linux_creat_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
O_WRONLY | O_CREAT | O_TRUNC, args->mode);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = kern_openat(td, AT_FDCWD, args->path, UIO_USERSPACE,
O_WRONLY | O_CREAT | O_TRUNC, args->mode);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
O_WRONLY | O_CREAT | O_TRUNC, args->mode);
LFREEPATH(path);
}
return (error);
}
#endif
static int
linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mode)
linux_common_open(struct thread *td, int dirfd, const char *path, int l_flags,
int mode, enum uio_seg seg)
{
struct proc *p = td->td_proc;
struct file *fp;
@ -163,7 +169,7 @@ linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mod
bsd_flags |= O_DIRECTORY;
/* XXX LINUX_O_NOATIME: unable to be easily implemented. */
error = kern_openat(td, dirfd, path, UIO_SYSSPACE, bsd_flags, mode);
error = kern_openat(td, dirfd, path, seg, bsd_flags, mode);
if (error != 0) {
if (error == EMLINK)
error = ELOOP;
@ -201,7 +207,6 @@ linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mod
}
done:
LFREEPATH(path);
return (error);
}
@ -209,15 +214,22 @@ int
linux_openat(struct thread *td, struct linux_openat_args *args)
{
char *path;
int dfd;
int dfd, error;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
if (!LUSECONVPATH(td)) {
return (linux_common_open(td, dfd, args->filename, args->flags,
args->mode, UIO_USERSPACE));
}
if (args->flags & LINUX_O_CREAT)
LCONVPATH_AT(td, args->filename, &path, 1, dfd);
else
LCONVPATH_AT(td, args->filename, &path, 0, dfd);
return (linux_common_open(td, dfd, path, args->flags, args->mode));
error = linux_common_open(td, dfd, path, args->flags, args->mode,
UIO_SYSSPACE);
LFREEPATH(path);
return (error);
}
#ifdef LINUX_LEGACY_SYSCALLS
@ -225,13 +237,21 @@ int
linux_open(struct thread *td, struct linux_open_args *args)
{
char *path;
int error;
if (!LUSECONVPATH(td)) {
return (linux_common_open(td, AT_FDCWD, args->path, args->flags,
args->mode, UIO_USERSPACE));
}
if (args->flags & LINUX_O_CREAT)
LCONVPATHCREAT(td, args->path, &path);
else
LCONVPATHEXIST(td, args->path, &path);
return (linux_common_open(td, AT_FDCWD, path, args->flags, args->mode));
error = linux_common_open(td, AT_FDCWD, path, args->flags, args->mode,
UIO_SYSSPACE);
LFREEPATH(path);
return (error);
}
#endif
@ -535,11 +555,15 @@ linux_access(struct thread *td, struct linux_access_args *args)
if (args->amode & ~(F_OK | X_OK | W_OK | R_OK))
return (EINVAL);
LCONVPATHEXIST(td, args->path, &path);
error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0,
args->amode);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = kern_accessat(td, AT_FDCWD, args->path, UIO_USERSPACE, 0,
args->amode);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0,
args->amode);
LFREEPATH(path);
}
return (error);
}
@ -556,10 +580,13 @@ linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0, args->amode);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = kern_accessat(td, dfd, args->filename, UIO_USERSPACE, 0, args->amode);
} else {
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0, args->amode);
LFREEPATH(path);
}
return (error);
}
@ -572,18 +599,31 @@ linux_unlink(struct thread *td, struct linux_unlink_args *args)
int error;
struct stat st;
LCONVPATHEXIST(td, args->path, &path);
error = kern_funlinkat(td, AT_FDCWD, path, FD_NONE, UIO_SYSSPACE, 0, 0);
if (error == EPERM) {
/* Introduce POSIX noncompliant behaviour of Linux */
if (kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st,
NULL) == 0) {
if (S_ISDIR(st.st_mode))
error = EISDIR;
if (!LUSECONVPATH(td)) {
error = kern_funlinkat(td, AT_FDCWD, args->path, FD_NONE,
UIO_USERSPACE, 0, 0);
if (error == EPERM) {
/* Introduce POSIX noncompliant behaviour of Linux */
if (kern_statat(td, 0, AT_FDCWD, args->path,
UIO_SYSSPACE, &st, NULL) == 0) {
if (S_ISDIR(st.st_mode))
error = EISDIR;
}
}
} else {
LCONVPATHEXIST(td, args->path, &path);
error = kern_funlinkat(td, AT_FDCWD, path, FD_NONE, UIO_SYSSPACE, 0, 0);
if (error == EPERM) {
/* Introduce POSIX noncompliant behaviour of Linux */
if (kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st,
NULL) == 0) {
if (S_ISDIR(st.st_mode))
error = EISDIR;
}
}
LFREEPATH(path);
}
LFREEPATH(path);
return (error);
}
#endif

4
sys/compat/linux/linux_mib.c
View File

@ -85,6 +85,10 @@ SYSCTL_BOOL(_compat_linux, OID_AUTO, map_sched_prio, CTLFLAG_RDTUN,
&linux_map_sched_prio, 0, "Map scheduler priorities to Linux priorities "
"(not POSIX compliant)");
int linux_use_emul_path = 1;
SYSCTL_INT(_compat_linux, OID_AUTO, use_emul_path, CTLFLAG_RWTUN,
&linux_use_emul_path, 0, "Use linux.compat.emul_path");
static int linux_set_osname(struct thread *td, char *osname);
static int linux_set_osrelease(struct thread *td, char *osrelease);
static int linux_set_oss_version(struct thread *td, int oss_version);

110
sys/compat/linux/linux_misc.c
View File

@ -263,18 +263,23 @@ linux_uselib(struct thread *td, struct linux_uselib_args *args)
int error;
bool locked, opened, textset;
LCONVPATHEXIST(td, args->library, &library);
a_out = NULL;
vp = NULL;
locked = false;
textset = false;
opened = false;
NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
UIO_SYSSPACE, library, td);
error = namei(&ni);
LFREEPATH(library);
if (!LUSECONVPATH(td)) {
NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
UIO_USERSPACE, args->library, td);
error = namei(&ni);
} else {
LCONVPATHEXIST(td, args->library, &library);
NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
UIO_SYSSPACE, library, td);
error = namei(&ni);
LFREEPATH(library);
}
if (error)
goto cleanup;
@ -732,12 +737,16 @@ linux_utime(struct thread *td, struct linux_utime_args *args)
struct l_utimbuf lut;
char *fname;
int error;
bool convpath;
LCONVPATHEXIST(td, args->fname, &fname);
convpath = LUSECONVPATH(td);
if (convpath)
LCONVPATHEXIST(td, args->fname, &fname);
if (args->times) {
if ((error = copyin(args->times, &lut, sizeof lut))) {
LFREEPATH(fname);
if (convpath)
LFREEPATH(fname);
return (error);
}
tv[0].tv_sec = lut.l_actime;
@ -748,9 +757,14 @@ linux_utime(struct thread *td, struct linux_utime_args *args)
} else
tvp = NULL;
error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp,
UIO_SYSSPACE);
LFREEPATH(fname);
if (!convpath) {
error = kern_utimesat(td, AT_FDCWD, args->fname, UIO_USERSPACE,
tvp, UIO_SYSSPACE);
} else {
error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp,
UIO_SYSSPACE);
LFREEPATH(fname);
}
return (error);
}
#endif
@ -763,8 +777,11 @@ linux_utimes(struct thread *td, struct linux_utimes_args *args)
struct timeval tv[2], *tvp = NULL;
char *fname;
int error;
bool convpath;
LCONVPATHEXIST(td, args->fname, &fname);
convpath = LUSECONVPATH(td);
if (convpath)
LCONVPATHEXIST(td, args->fname, &fname);
if (args->tptr != NULL) {
if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
@ -778,9 +795,14 @@ linux_utimes(struct thread *td, struct linux_utimes_args *args)
tvp = tv;
}
error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE,
tvp, UIO_SYSSPACE);
LFREEPATH(fname);
if (!convpath) {
error = kern_utimesat(td, AT_FDCWD, args->fname, UIO_USERSPACE,
tvp, UIO_SYSSPACE);
} else {
error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE,
tvp, UIO_SYSSPACE);
LFREEPATH(fname);
}
return (error);
}
#endif
@ -881,13 +903,17 @@ linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
struct timeval tv[2], *tvp = NULL;
char *fname;
int error, dfd;
bool convpath;
convpath = LUSECONVPATH(td);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
if (convpath)
LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
if (args->utimes != NULL) {
if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
LFREEPATH(fname);
if (convpath)
LFREEPATH(fname);
return (error);
}
tv[0].tv_sec = ltv[0].tv_sec;
@ -897,8 +923,13 @@ linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
tvp = tv;
}
error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
LFREEPATH(fname);
if (!convpath) {
error = kern_utimesat(td, dfd, args->filename, UIO_USERSPACE,
tvp, UIO_SYSSPACE);
} else {
error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
LFREEPATH(fname);
}
return (error);
}
#endif
@ -1062,19 +1093,28 @@ linux_mknod(struct thread *td, struct linux_mknod_args *args)
{
char *path;
int error;
enum uio_seg seg;
bool convpath;
LCONVPATHCREAT(td, args->path, &path);
convpath = LUSECONVPATH(td);
if (!convpath) {
path = args->path;
seg = UIO_USERSPACE;
} else {
LCONVPATHCREAT(td, args->path, &path);
seg = UIO_SYSSPACE;
}
switch (args->mode & S_IFMT) {
case S_IFIFO:
case S_IFSOCK:
error = kern_mkfifoat(td, AT_FDCWD, path, UIO_SYSSPACE,
error = kern_mkfifoat(td, AT_FDCWD, path, seg,
args->mode);
break;
case S_IFCHR:
case S_IFBLK:
error = kern_mknodat(td, AT_FDCWD, path, UIO_SYSSPACE,
error = kern_mknodat(td, AT_FDCWD, path, seg,
args->mode, args->dev);
break;
@ -1086,7 +1126,7 @@ linux_mknod(struct thread *td, struct linux_mknod_args *args)
args->mode |= S_IFREG;
/* FALLTHROUGH */
case S_IFREG:
error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
error = kern_openat(td, AT_FDCWD, path, seg,
O_WRONLY | O_CREAT | O_TRUNC, args->mode);
if (error == 0)
kern_close(td, td->td_retval[0]);
@ -1096,7 +1136,8 @@ linux_mknod(struct thread *td, struct linux_mknod_args *args)
error = EINVAL;
break;
}
LFREEPATH(path);
if (convpath)
LFREEPATH(path);
return (error);
}
#endif
@ -1106,19 +1147,29 @@ linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
{
char *path;
int error, dfd;
enum uio_seg seg;
bool convpath;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
convpath = LUSECONVPATH(td);
if (!convpath) {
path = __DECONST(char *, args->filename);
seg = UIO_USERSPACE;
} else {
LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
seg = UIO_SYSSPACE;
}
switch (args->mode & S_IFMT) {
case S_IFIFO:
case S_IFSOCK:
error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
error = kern_mkfifoat(td, dfd, path, seg, args->mode);
break;
case S_IFCHR:
case S_IFBLK:
error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
error = kern_mknodat(td, dfd, path, seg, args->mode,
args->dev);
break;
@ -1130,7 +1181,7 @@ linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
args->mode |= S_IFREG;
/* FALLTHROUGH */
case S_IFREG:
error = kern_openat(td, dfd, path, UIO_SYSSPACE,
error = kern_openat(td, dfd, path, seg,
O_WRONLY | O_CREAT | O_TRUNC, args->mode);
if (error == 0)
kern_close(td, td->td_retval[0]);
@ -1140,7 +1191,8 @@ linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
error = EINVAL;
break;
}
LFREEPATH(path);
if (convpath)
LFREEPATH(path);
return (error);
}

128
sys/compat/linux/linux_stats.c
View File

@ -89,7 +89,7 @@ translate_vnhook_major_minor(struct vnode *vp, struct stat *sb)
}
static int
linux_kern_statat(struct thread *td, int flag, int fd, char *path,
linux_kern_statat(struct thread *td, int flag, int fd, const char *path,
enum uio_seg pathseg, struct stat *sbp)
{
@ -99,7 +99,7 @@ linux_kern_statat(struct thread *td, int flag, int fd, char *path,
#ifdef LINUX_LEGACY_SYSCALLS
static int
linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg,
linux_kern_stat(struct thread *td, const char *path, enum uio_seg pathseg,
struct stat *sbp)
{
@ -107,7 +107,7 @@ linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg,
}
static int
linux_kern_lstat(struct thread *td, char *path, enum uio_seg pathseg,
linux_kern_lstat(struct thread *td, const char *path, enum uio_seg pathseg,
struct stat *sbp)
{
@ -210,10 +210,13 @@ linux_newstat(struct thread *td, struct linux_newstat_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = linux_kern_stat(td, args->path, UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
}
if (error)
return (error);
return (newstat_copyout(&buf, args->buf));
@ -226,10 +229,13 @@ linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
error = linux_kern_lstat(td, args->path, UIO_USERSPACE, &sb);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb);
LFREEPATH(path);
}
if (error)
return (error);
return (newstat_copyout(&sb, args->buf));
@ -286,14 +292,16 @@ linux_stat(struct thread *td, struct linux_stat_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
if (error) {
if (!LUSECONVPATH(td)) {
error = linux_kern_stat(td, args->path, UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
}
if (error) {
return (error);
}
LFREEPATH(path);
return (stat_copyout(&buf, args->up));
}
@ -304,14 +312,16 @@ linux_lstat(struct thread *td, struct linux_lstat_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf);
if (error) {
if (!LUSECONVPATH(td)) {
error = linux_kern_lstat(td, args->path, UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST(td, args->path, &path);
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
}
if (error) {
return (error);
}
LFREEPATH(path);
return (stat_copyout(&buf, args->up));
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
@ -413,11 +423,15 @@ linux_statfs(struct thread *td, struct linux_statfs_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, args->path, UIO_USERSPACE, bsd_statfs);
} else {
LCONVPATHEXIST(td, args->path, &path);
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
}
if (error == 0)
error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
@ -457,11 +471,15 @@ linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
if (args->bufsize != sizeof(struct l_statfs64))
return (EINVAL);
LCONVPATHEXIST(td, args->path, &path);
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
if (!LUSECONVPATH(td)) {
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, args->path, UIO_USERSPACE, bsd_statfs);
} else {
LCONVPATHEXIST(td, args->path, &path);
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
}
if (error == 0)
bsd_to_linux_statfs64(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
@ -568,10 +586,13 @@ linux_stat64(struct thread *td, struct linux_stat64_args *args)
char *filename;
int error;
LCONVPATHEXIST(td, args->filename, &filename);
error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf);
LFREEPATH(filename);
if (!LUSECONVPATH(td)) {
error = linux_kern_stat(td, args->filename, UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST(td, args->filename, &filename);
error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf);
LFREEPATH(filename);
}
if (error)
return (error);
return (stat64_copyout(&buf, args->statbuf));
@ -584,10 +605,13 @@ linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
char *filename;
int error;
LCONVPATHEXIST(td, args->filename, &filename);
error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb);
LFREEPATH(filename);
if (!LUSECONVPATH(td)) {
error = linux_kern_lstat(td, args->filename, UIO_USERSPACE, &sb);
} else {
LCONVPATHEXIST(td, args->filename, &filename);
error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb);
LFREEPATH(filename);
}
if (error)
return (error);
return (stat64_copyout(&sb, args->statbuf));
@ -620,12 +644,16 @@ linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args)
AT_SYMLINK_NOFOLLOW : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
if (!error)
if (!LUSECONVPATH(td)) {
error = linux_kern_statat(td, flag, dfd, args->pathname,
UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
}
if (error == 0)
error = stat64_copyout(&buf, args->statbuf);
LFREEPATH(path);
return (error);
}
@ -645,12 +673,16 @@ linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args)
AT_SYMLINK_NOFOLLOW : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
if (!LUSECONVPATH(td)) {
error = linux_kern_statat(td, flag, dfd, args->pathname,
UIO_USERSPACE, &buf);
} else {
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
}
if (error == 0)
error = newstat_copyout(&buf, args->statbuf);
LFREEPATH(path);
return (error);
}

65
sys/compat/linux/linux_uid16.c
View File

@ -112,22 +112,25 @@ linux_chown16(struct thread *td, struct linux_chown16_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) {
error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
} else {
LCONVPATHEXIST(td, args->path, &path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
}
return (error);
}
@ -137,22 +140,26 @@ linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) {
error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
} else {
LCONVPATHEXIST(td, args->path, &path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
}
return (error);
}

3
sys/compat/linux/linux_util.h
View File

@ -51,9 +51,12 @@ MALLOC_DECLARE(M_FUTEX);
MALLOC_DECLARE(M_FUTEX_WP);
extern char linux_emul_path[];
extern int linux_use_emul_path;
int linux_emul_convpath(struct thread *, const char *, enum uio_seg, char **, int, int);
#define LUSECONVPATH(td) atomic_load_int(&linux_use_emul_path)
#define LCONVPATH_AT(td, upath, pathp, i, dfd) \
do { \
int _error; \

14
sys/i386/linux/linux_machdep.c
View File

@ -104,11 +104,15 @@ linux_execve(struct thread *td, struct linux_execve_args *args)
char *newpath;
int error;
LCONVPATHEXIST(td, args->path, &newpath);
error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE,
args->argp, args->envp);
LFREEPATH(newpath);
if (!LUSECONVPATH(td)) {
error = exec_copyin_args(&eargs, args->path, UIO_USERSPACE,
args->argp, args->envp);
} else {
LCONVPATHEXIST(td, args->path, &newpath);
error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE,
args->argp, args->envp);
LFREEPATH(newpath);
}
if (error == 0)
error = linux_common_execve(td, &eargs);
return (error);