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SUSE:SLE-12-SP5:GA
qemu-linux-user.7436
0160-9p-introduce-the-V9fsDir-type.patch
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File 0160-9p-introduce-the-V9fsDir-type.patch of Package qemu-linux-user.7436
From 284d01f18fb54d3210af34403d448be372399c0b Mon Sep 17 00:00:00 2001 From: Greg Kurz <gkurz@linux.vnet.ibm.com> Date: Mon, 6 Jun 2016 11:52:34 +0200 Subject: [PATCH] 9p: introduce the V9fsDir type If we are to switch back to readdir(), we need a more complex type than DIR * to be able to serialize concurrent accesses to the directory stream. This patch introduces a placeholder type and fixes all users. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> (cherry picked from commit f314ea4e30a1ef87bf8845da952c6dd0bac20b95) [BR: Fix and/or infrastructure for BSC#1020427 CVE-2016-9602] Signed-off-by: Bruce Rogers <brogers@suse.com> --- hw/9pfs/9p-handle.c | 18 +++++++++--------- hw/9pfs/9p-local.c | 18 +++++++++--------- hw/9pfs/9p-proxy.c | 20 ++++++++++---------- hw/9pfs/9p.c | 12 ++++++------ hw/9pfs/9p.h | 6 +++++- 5 files changed, 39 insertions(+), 35 deletions(-) diff --git a/hw/9pfs/9p-handle.c b/hw/9pfs/9p-handle.c index 6ce923dc71..982fd9878c 100644 --- a/hw/9pfs/9p-handle.c +++ b/hw/9pfs/9p-handle.c @@ -112,7 +112,7 @@ static int handle_close(FsContext *ctx, V9fsFidOpenState *fs) static int handle_closedir(FsContext *ctx, V9fsFidOpenState *fs) { - return closedir(fs->dir); + return closedir(fs->dir.stream); } static int handle_open(FsContext *ctx, V9fsPath *fs_path, @@ -132,8 +132,8 @@ static int handle_opendir(FsContext *ctx, if (ret < 0) { return -1; } - fs->dir = fdopendir(ret); - if (!fs->dir) { + fs->dir.stream = fdopendir(ret); + if (!fs->dir.stream) { return -1; } return 0; @@ -141,24 +141,24 @@ static int handle_opendir(FsContext *ctx, static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) { - rewinddir(fs->dir); + rewinddir(fs->dir.stream); } static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs) { - return telldir(fs->dir); + return telldir(fs->dir.stream); } static int handle_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, struct dirent *entry, struct dirent **result) { - return readdir_r(fs->dir, entry, result); + return readdir_r(fs->dir.stream, entry, result); } static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) { - seekdir(fs->dir, off); + seekdir(fs->dir.stream, off); } static ssize_t handle_preadv(FsContext *ctx, V9fsFidOpenState *fs, @@ -262,7 +262,7 @@ static int handle_fstat(FsContext *fs_ctx, int fid_type, int fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } @@ -409,7 +409,7 @@ static int handle_fsync(FsContext *ctx, int fid_type, int fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c index 92896ad898..18ad0ed5ef 100644 --- a/hw/9pfs/9p-local.c +++ b/hw/9pfs/9p-local.c @@ -348,7 +348,7 @@ static int local_close(FsContext *ctx, V9fsFidOpenState *fs) static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) { - return closedir(fs->dir); + return closedir(fs->dir.stream); } static int local_open(FsContext *ctx, V9fsPath *fs_path, @@ -370,9 +370,9 @@ static int local_opendir(FsContext *ctx, char *path = fs_path->data; buffer = rpath(ctx, path); - fs->dir = opendir(buffer); + fs->dir.stream = opendir(buffer); g_free(buffer); - if (!fs->dir) { + if (!fs->dir.stream) { return -1; } return 0; @@ -380,12 +380,12 @@ static int local_opendir(FsContext *ctx, static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) { - rewinddir(fs->dir); + rewinddir(fs->dir.stream); } static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) { - return telldir(fs->dir); + return telldir(fs->dir.stream); } static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, @@ -395,7 +395,7 @@ static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, int ret; again: - ret = readdir_r(fs->dir, entry, result); + ret = readdir_r(fs->dir.stream, entry, result); if (ctx->export_flags & V9FS_SM_MAPPED) { entry->d_type = DT_UNKNOWN; } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { @@ -411,7 +411,7 @@ again: static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) { - seekdir(fs->dir, off); + seekdir(fs->dir.stream, off); } static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs, @@ -610,7 +610,7 @@ static int local_fstat(FsContext *fs_ctx, int fid_type, int err, fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } @@ -998,7 +998,7 @@ static int local_fsync(FsContext *ctx, int fid_type, int fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } diff --git a/hw/9pfs/9p-proxy.c b/hw/9pfs/9p-proxy.c index 7c6aaf390a..d5587f91d5 100644 --- a/hw/9pfs/9p-proxy.c +++ b/hw/9pfs/9p-proxy.c @@ -633,7 +633,7 @@ static int proxy_close(FsContext *ctx, V9fsFidOpenState *fs) static int proxy_closedir(FsContext *ctx, V9fsFidOpenState *fs) { - return closedir(fs->dir); + return closedir(fs->dir.stream); } static int proxy_open(FsContext *ctx, V9fsPath *fs_path, @@ -652,14 +652,14 @@ static int proxy_opendir(FsContext *ctx, { int serrno, fd; - fs->dir = NULL; + fs->dir.stream = NULL; fd = v9fs_request(ctx->private, T_OPEN, NULL, "sd", fs_path, O_DIRECTORY); if (fd < 0) { errno = -fd; return -1; } - fs->dir = fdopendir(fd); - if (!fs->dir) { + fs->dir.stream = fdopendir(fd); + if (!fs->dir.stream) { serrno = errno; close(fd); errno = serrno; @@ -670,24 +670,24 @@ static int proxy_opendir(FsContext *ctx, static void proxy_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) { - rewinddir(fs->dir); + rewinddir(fs->dir.stream); } static off_t proxy_telldir(FsContext *ctx, V9fsFidOpenState *fs) { - return telldir(fs->dir); + return telldir(fs->dir.stream); } static int proxy_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, struct dirent *entry, struct dirent **result) { - return readdir_r(fs->dir, entry, result); + return readdir_r(fs->dir.stream, entry, result); } static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) { - seekdir(fs->dir, off); + seekdir(fs->dir.stream, off); } static ssize_t proxy_preadv(FsContext *ctx, V9fsFidOpenState *fs, @@ -791,7 +791,7 @@ static int proxy_fstat(FsContext *fs_ctx, int fid_type, int fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } @@ -936,7 +936,7 @@ static int proxy_fsync(FsContext *ctx, int fid_type, int fd; if (fid_type == P9_FID_DIR) { - fd = dirfd(fs->dir); + fd = dirfd(fs->dir.stream); } else { fd = fs->fd; } diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index d71f30926b..d55ef7719f 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -232,7 +232,7 @@ static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) } while (err == -EINTR && !pdu->cancelled); } } else if (f->fid_type == P9_FID_DIR) { - if (f->fs.dir == NULL) { + if (f->fs.dir.stream == NULL) { do { err = v9fs_co_opendir(pdu, f); } while (err == -EINTR && !pdu->cancelled); @@ -346,7 +346,7 @@ static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp) retval = v9fs_co_close(pdu, &fidp->fs); } } else if (fidp->fid_type == P9_FID_DIR) { - if (fidp->fs.dir != NULL) { + if (fidp->fs.dir.stream != NULL) { retval = v9fs_co_closedir(pdu, &fidp->fs); } } else if (fidp->fid_type == P9_FID_XATTR) { @@ -444,7 +444,7 @@ void v9fs_reclaim_fd(V9fsPDU *pdu) reclaim_count++; } } else if (f->fid_type == P9_FID_DIR) { - if (f->fs.dir != NULL) { + if (f->fs.dir.stream != NULL) { /* * Up the reference count so that * a clunk request won't free this fid @@ -452,8 +452,8 @@ void v9fs_reclaim_fd(V9fsPDU *pdu) f->ref++; f->rclm_lst = reclaim_list; reclaim_list = f; - f->fs_reclaim.dir = f->fs.dir; - f->fs.dir = NULL; + f->fs_reclaim.dir.stream = f->fs.dir.stream; + f->fs.dir.stream = NULL; reclaim_count++; } } @@ -1924,7 +1924,7 @@ static void v9fs_readdir(void *opaque) retval = -EINVAL; goto out_nofid; } - if (!fidp->fs.dir) { + if (!fidp->fs.dir.stream) { retval = -EINVAL; goto out; } diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h index 600164133b..d25a817110 100644 --- a/hw/9pfs/9p.h +++ b/hw/9pfs/9p.h @@ -169,13 +169,17 @@ typedef struct V9fsXattr int flags; } V9fsXattr; +typedef struct V9fsDir { + DIR *stream; +} V9fsDir; + /* * Filled by fs driver on open and other * calls. */ union V9fsFidOpenState { int fd; - DIR *dir; + V9fsDir dir; V9fsXattr xattr; /* * private pointer for fs drivers, that
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