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NAS-126719 / Add O_RESOLVE_NO_SYMLINKS #268

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NAS-126719 / Add O_RESOLVE_NO_SYMLINKS #268

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8 changes: 8 additions & 0 deletions sys/kern/vfs_lookup.c
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,9 @@ __FBSDID("$FreeBSD$");
#define NAMEI_DIAGNOSTIC 1
#undef NAMEI_DIAGNOSTIC

FEATURE(rnosymlink, "supports RESOLVE_NO_SYMLINK");
FEATURE(rbeneath, "supports RESOLVE_BENEATH");

SDT_PROVIDER_DEFINE(vfs);
SDT_PROBE_DEFINE4(vfs, namei, lookup, entry, "struct vnode *", "char *",
"unsigned long", "bool");
Expand Down Expand Up @@ -1192,6 +1195,11 @@ lookup(struct nameidata *ndp)
error = ENOENT;
goto bad2;
}
if (cnp->cn_flags & RNOSYMLINK) {
/* Linux openat2() behavior for RESOLVE_NO_SYMLINKS */
error = ELOOP;
goto bad2;
}
if (dp->v_mount->mnt_flag & MNT_NOSYMFOLLOW) {
error = EACCES;
goto bad2;
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2 changes: 2 additions & 0 deletions sys/kern/vfs_vnops.c
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Expand Up @@ -201,6 +201,8 @@ open2nameif(int fmode, u_int vn_open_flags)
res = ISOPEN | LOCKLEAF;
if ((fmode & O_RESOLVE_BENEATH) != 0)
res |= RBENEATH;
if ((fmode & O_RESOLVE_NO_SYMLINKS) != 0)
res |= RNOSYMLINK;
if ((fmode & O_EMPTY_PATH) != 0)
res |= EMPTYPATH;
if ((vn_open_flags & VN_OPEN_NOAUDIT) == 0)
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1 change: 1 addition & 0 deletions sys/sys/fcntl.h
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Expand Up @@ -143,6 +143,7 @@ typedef __pid_t pid_t;
#define O_DSYNC 0x01000000 /* POSIX data sync */
#if __BSD_VISIBLE
#define O_EMPTY_PATH 0x02000000
#define O_RESOLVE_NO_SYMLINKS 0x04000000
#endif

/*
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1 change: 1 addition & 0 deletions sys/sys/namei.h
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Expand Up @@ -155,6 +155,7 @@ int cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
#define LOCKSHARED 0x0100 /* Shared lock leaf */
#define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */
#define RBENEATH 0x100000000ULL /* No escape, even tmp, from start dir */
#define RNOSYMLINK 0x200000000ULL /* Do not follow any symbolic links */
#define MODMASK 0xf000001ffULL /* mask of operational modifiers */

/*
Expand Down