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filedesc: fix up breakage introduced in 272505

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Include sequence counter supports incoditionally [1]. This fixes reprted build
problems with e.g. nvidia driver due to missing opt_capsicum.h.

Replace fishy looking sizeof with offsetof. Make fde_seq the last member in
order to simplify calculations.

Suggested by:	kib [1]
X-MFC:		with 272505
This commit is contained in:
Mateusz Guzik 2014-10-05 19:40:29 +00:00
parent 57c2505e65
commit 2b4a2528d7
2 changed files with 7 additions and 21 deletions
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10
sys/kern/kern_descrip.c
View File

@ -295,7 +295,7 @@ _fdfree(struct filedesc *fdp, int fd, int last)
filecaps_free(&fde->fde_caps);
if (last)
return;
bzero(fde_change(fde), fde_change_size);
bzero(fde, fde_change_size);
fdunused(fdp, fd);
#ifdef CAPABILITIES
seq_write_end(&fde->fde_seq);
@ -894,7 +894,7 @@ do_dup(struct thread *td, int flags, int old, int new,
seq_write_begin(&newfde->fde_seq);
#endif
filecaps_free(&newfde->fde_caps);
memcpy(fde_change(newfde), fde_change(oldfde), fde_change_size);
memcpy(newfde, oldfde, fde_change_size);
filecaps_copy(&oldfde->fde_caps, &newfde->fde_caps);
if ((flags & DUP_CLOEXEC) != 0)
newfde->fde_flags = oldfde->fde_flags | UF_EXCLOSE;
@ -2778,7 +2778,7 @@ dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode,
#ifdef CAPABILITIES
seq_write_begin(&newfde->fde_seq);
#endif
memcpy(fde_change(newfde), fde_change(oldfde), fde_change_size);
memcpy(newfde, oldfde, fde_change_size);
filecaps_copy(&oldfde->fde_caps, &newfde->fde_caps);
#ifdef CAPABILITIES
seq_write_end(&newfde->fde_seq);
@ -2793,8 +2793,8 @@ dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode,
#ifdef CAPABILITIES
seq_write_begin(&newfde->fde_seq);
#endif
memcpy(fde_change(newfde), fde_change(oldfde), fde_change_size);
bzero(fde_change(oldfde), fde_change_size);
memcpy(newfde, oldfde, fde_change_size);
bzero(oldfde, fde_change_size);
fdunused(fdp, dfd);
#ifdef CAPABILITIES
seq_write_end(&newfde->fde_seq);

18
sys/sys/filedesc.h
View File

@ -33,10 +33,6 @@
#ifndef _SYS_FILEDESC_H_
#define _SYS_FILEDESC_H_
#ifdef _KERNEL
#include "opt_capsicum.h"
#endif
#include <sys/caprights.h>
#include <sys/queue.h>
#include <sys/event.h>
@ -55,24 +51,16 @@ struct filecaps {
};
struct filedescent {
#ifdef CAPABILITIES
seq_t fde_seq; /* if you need fde_file and fde_caps in sync */
#endif
struct file *fde_file; /* file structure for open file */
struct filecaps fde_caps; /* per-descriptor rights */
uint8_t fde_flags; /* per-process open file flags */
seq_t fde_seq; /* if you need fde_file and fde_caps in sync */
};
#define fde_rights fde_caps.fc_rights
#define fde_fcntls fde_caps.fc_fcntls
#define fde_ioctls fde_caps.fc_ioctls
#define fde_nioctls fde_caps.fc_nioctls
#ifdef CAPABILITIES
#define fde_change(fde) ((char *)(fde) + sizeof(seq_t))
#define fde_change_size (sizeof(struct filedescent) - sizeof(seq_t))
#else
#define fde_change(fde) ((fde))
#define fde_change_size (sizeof(struct filedescent))
#endif
#define fde_change_size (offsetof(struct filedescent, fde_seq))
/*
* This structure is used for the management of descriptors. It may be
@ -97,9 +85,7 @@ struct filedesc {
int fd_holdleaderscount; /* block fdfree() for shared close() */
int fd_holdleaderswakeup; /* fdfree() needs wakeup */
};
#ifdef CAPABILITIES
#define fd_seq(fdp, fd) (&(fdp)->fd_ofiles[(fd)].fde_seq)
#endif
/*
* Structure to keep track of (process leader, struct fildedesc) tuples.