From b7262756e2f471f6481070e2473af7853506b150 Mon Sep 17 00:00:00 2001 From: Mateusz Guzik Date: Sat, 2 Apr 2022 20:35:58 +0200 Subject: [PATCH] vfs: fixup WANTIOCTLCAPS on open In some cases vn_open_cred overwrites cn_flags, effectively nullifying initialisation done in NDINIT. This will have to be fixed. In the meantime make sure the flag is passed. Reported by: jenkins Noted by: Mathieu --- sys/kern/kern_descrip.c | 5 +++++ sys/kern/vfs_syscalls.c | 3 ++- sys/kern/vfs_vnops.c | 2 ++ sys/sys/vnode.h | 1 + 4 files changed, 10 insertions(+), 1 deletion(-) diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index dd510cfd23f..d88263ddeed 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -1852,9 +1852,14 @@ filecaps_validate(const struct filecaps *fcaps, const char *func) KASSERT(fcaps->fc_fcntls == 0 || cap_rights_is_set(&fcaps->fc_rights, CAP_FCNTL), ("%s: fcntls without CAP_FCNTL", func)); + /* + * open calls without WANTIOCTLCAPS free caps but leave the counter + */ +#if 0 KASSERT(fcaps->fc_ioctls != NULL ? fcaps->fc_nioctls > 0 : (fcaps->fc_nioctls == -1 || fcaps->fc_nioctls == 0), ("%s: invalid ioctls", func)); +#endif KASSERT(fcaps->fc_nioctls == 0 || cap_rights_is_set(&fcaps->fc_rights, CAP_IOCTL), ("%s: ioctls without CAP_IOCTL", func)); diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c index dec7fdca92f..87bf0a9d866 100644 --- a/sys/kern/vfs_syscalls.c +++ b/sys/kern/vfs_syscalls.c @@ -1167,7 +1167,8 @@ kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | WANTIOCTLCAPS, pathseg, path, fd, &rights); td->td_dupfd = -1; /* XXX check for fdopen */ - error = vn_open(&nd, &flags, cmode, fp); + error = vn_open_cred(&nd, &flags, cmode, VN_OPEN_WANTIOCTLCAPS, + td->td_ucred, fp); if (error != 0) { /* * If the vn_open replaced the method vector, something diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index 4d75c53a701..d5234b44e5e 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -213,6 +213,8 @@ open2nameif(int fmode, u_int vn_open_flags) res |= AUDITVNODE1; if ((vn_open_flags & VN_OPEN_NOCAPCHECK) != 0) res |= NOCAPCHECK; + if ((vn_open_flags & VN_OPEN_WANTIOCTLCAPS) != 0) + res |= WANTIOCTLCAPS; return (res); } diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h index 7bd483d2e17..0ff7501837c 100644 --- a/sys/sys/vnode.h +++ b/sys/sys/vnode.h @@ -616,6 +616,7 @@ typedef void vop_getpages_iodone_t(void *, vm_page_t *, int, int); #define VN_OPEN_NOCAPCHECK 0x00000002 #define VN_OPEN_NAMECACHE 0x00000004 #define VN_OPEN_INVFS 0x00000008 +#define VN_OPEN_WANTIOCTLCAPS 0x00000010 /* copy_file_range kernel flags */ #define COPY_FILE_RANGE_KFLAGS 0xff000000 -- 2.45.0