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authorNithya Balachandran <nbalacha@redhat.com>2014-12-17 13:58:56 +0530
committerRaghavendra Bhat <raghavendra@redhat.com>2015-02-18 22:55:08 -0800
commitf1c4ce0e220a46b7a43c9303c0d137498d421101 (patch)
treec710507701ad74105e74d0345a4349cd4b9ea740 /xlators/storage/posix
parent692dd7e83cc8a1c85581dda3f752d5ea3b184f8c (diff)
Storage/posix : Adding error checks in path formation
Renaming directories can cause the size of the buffer required for posix_handle_path to increase between the first call, which calculates the size, and the second call which forms the path in the buffer allocated based on the size calculated in the first call. The path created in the second call overflows the allocated buffer and overwrites the stack causing the brick process to crash. The fix adds a buffer size check to prevent the buffer overflow. It also checks and returns an error if the posix_handle_path call is unable to form the path instead of working on the incomplete path, which is likely to cause subsequent calls using the path to fail with ELOOP. Preventing buffer overflow and handling errors BUG: 1113960 Change-Id: If3d3c1952e297ad14f121f05f90a35baf42923aa Signed-off-by: Nithya Balachandran <nbalacha@redhat.com> Reviewed-on: http://review.gluster.org/9289 Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Diffstat (limited to 'xlators/storage/posix')
-rw-r--r--xlators/storage/posix/src/posix-handle.c23
-rw-r--r--xlators/storage/posix/src/posix-handle.h15
-rw-r--r--xlators/storage/posix/src/posix-helpers.c33
-rw-r--r--xlators/storage/posix/src/posix.c133
4 files changed, 184 insertions, 20 deletions
diff --git a/xlators/storage/posix/src/posix-handle.c b/xlators/storage/posix/src/posix-handle.c
index 7ab6543..5d184d9 100644
--- a/xlators/storage/posix/src/posix-handle.c
+++ b/xlators/storage/posix/src/posix-handle.c
@@ -296,8 +296,12 @@ posix_handle_pump (xlator_t *this, char *buf, int len, int maxlen,
blen = link_len - 48;
- if(len + blen >= maxlen)
+ if (len + blen >= maxlen) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "Unable to form handle path for %s (maxlen = %d)",
+ buf, maxlen);
goto err;
+ }
memmove (buf + base_len + blen, buf + base_len,
(strlen (buf) - base_len) + 1);
@@ -371,11 +375,11 @@ posix_handle_path (xlator_t *this, uuid_t gfid, const char *basename,
errno = 0;
ret = posix_handle_pump (this, buf, len, maxlen,
base_str, base_len, pfx_len);
+ len = ret;
+
if (ret == -1)
break;
- len = ret;
-
ret = lstat (buf, &stat);
} while ((ret == -1) && errno == ELOOP);
@@ -841,13 +845,18 @@ posix_handle_unset (xlator_t *this, uuid_t gfid, const char *basename)
struct iatt stat;
char *path = NULL;
-
if (!basename) {
ret = posix_handle_unset_gfid (this, gfid);
return ret;
}
MAKE_HANDLE_PATH (path, this, gfid, basename);
+ if (!path) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to create handle path for %s (%s)",
+ basename, uuid_utoa(gfid));
+ return -1;
+ }
ret = posix_istat (this, gfid, basename, &stat);
@@ -872,6 +881,12 @@ posix_create_link_if_gfid_exists (xlator_t *this, uuid_t gfid,
char *newpath = NULL;
MAKE_HANDLE_PATH (newpath, this, gfid, NULL);
+ if (!newpath) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to create handle path (%s)", uuid_utoa(gfid));
+ return ret;
+ }
+
ret = lstat (newpath, &stbuf);
if (!ret) {
ret = sys_link (newpath, real_path);
diff --git a/xlators/storage/posix/src/posix-handle.h b/xlators/storage/posix/src/posix-handle.h
index 0ce9575..3af1a70 100644
--- a/xlators/storage/posix/src/posix-handle.h
+++ b/xlators/storage/posix/src/posix-handle.h
@@ -146,6 +146,8 @@
break; \
var = alloca (__len); \
__len = posix_handle_path (this, gfid, base, var, __len); \
+ if (__len <= 0) \
+ var = NULL; \
} while (0)
@@ -192,7 +194,13 @@
errno = 0; \
op_ret = posix_istat (this, loc->gfid, NULL, iatt_p); \
if (errno != ELOOP) { \
- MAKE_HANDLE_PATH (rpath, this, loc->gfid, NULL); \
+ MAKE_HANDLE_PATH (rpath, this, (loc)->gfid, NULL); \
+ if (!rpath) { \
+ op_ret = -1; \
+ gf_log (this->name, GF_LOG_ERROR, \
+ "Failed to create inode handle " \
+ "for path %s", (loc)->path); \
+ } \
break; \
} \
/* __ret == -1 && errno == ELOOP */ \
@@ -220,6 +228,11 @@
if (errno != ELOOP) { \
MAKE_HANDLE_PATH (parp, this, loc->pargfid, NULL); \
MAKE_HANDLE_PATH (entp, this, loc->pargfid, loc->name); \
+ if (!parp || !entp) { \
+ gf_log (this->name, GF_LOG_ERROR, \
+ "Failed to create entry handle " \
+ "for path %s", loc->path); \
+ } \
break; \
} \
/* __ret == -1 && errno == ELOOP */ \
diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index 62b0d2e..2920f31 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -465,10 +465,17 @@ posix_istat (xlator_t *this, uuid_t gfid, const char *basename,
int ret = 0;
struct posix_private *priv = NULL;
-
priv = this->private;
MAKE_HANDLE_PATH (real_path, this, gfid, basename);
+ if (!real_path) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "Failed to create handle path for %s/%s",
+ uuid_utoa (gfid), basename ? basename : "");
+ errno = ESTALE;
+ ret = -1;
+ goto out;
+ }
ret = lstat (real_path, &lstatbuf);
@@ -819,6 +826,13 @@ posix_get_file_contents (xlator_t *this, uuid_t pargfid,
MAKE_HANDLE_PATH (real_path, this, pargfid, name);
+ if (!real_path) {
+ op_ret = -ESTALE;
+ gf_log (this->name, GF_LOG_ERROR,
+ "Failed to create handle path for %s/%s",
+ uuid_utoa (pargfid), name);
+ goto out;
+ }
op_ret = posix_istat (this, pargfid, name, &stbuf);
if (op_ret == -1) {
@@ -1018,10 +1032,12 @@ del_stale_dir_handle (xlator_t *this, uuid_t gfid)
}
size = posix_handle_path (this, gfid, NULL, newpath, sizeof (newpath));
- if (size <= 0 && errno == ENOENT) {
- gf_log (this->name, GF_LOG_DEBUG, "%s: %s", newpath,
- strerror (ENOENT));
- stale = _gf_true;
+ if (size <= 0) {
+ if (errno == ENOENT) {
+ gf_log (this->name, GF_LOG_DEBUG, "%s: %s", newpath,
+ strerror (ENOENT));
+ stale = _gf_true;
+ }
goto out;
}
@@ -1380,6 +1396,13 @@ __posix_fd_ctx_get (fd_t *fd, xlator_t *this, struct posix_fd **pfd_p)
goto out;
MAKE_HANDLE_PATH (real_path, this, fd->inode->gfid, NULL);
+ if (!real_path) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "Failed to create handle path (%s)",
+ uuid_utoa (fd->inode->gfid));
+ ret = -1;
+ goto out;
+ }
pfd = GF_CALLOC (1, sizeof (*pfd), gf_posix_mt_posix_fd);
if (!pfd) {
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index 18ff857..b712ab3 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -147,7 +147,8 @@ posix_lookup (call_frame_t *frame, xlator_t *this,
if (op_errno != ENOENT) {
gf_log (this->name, GF_LOG_ERROR,
"lstat on %s failed: %s",
- real_path, strerror (op_errno));
+ real_path ? real_path : "null",
+ strerror (op_errno));
}
entry_ret = -1;
@@ -243,7 +244,8 @@ posix_stat (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
op_errno = errno;
gf_log (this->name, (op_errno == ENOENT)?
GF_LOG_DEBUG:GF_LOG_ERROR,
- "lstat on %s failed: %s", real_path,
+ "lstat on %s failed: %s",
+ real_path ? real_path : "<null>",
strerror (op_errno));
goto out;
}
@@ -378,8 +380,8 @@ posix_setattr (call_frame_t *frame, xlator_t *this,
if (op_ret == -1) {
op_errno = errno;
gf_log (this->name, GF_LOG_ERROR,
- "setattr (lstat) on %s failed: %s", real_path,
- strerror (op_errno));
+ "setattr (lstat) on %s failed: %s",
+ real_path ? real_path : "<null>", strerror (op_errno));
goto out;
}
@@ -905,6 +907,10 @@ posix_opendir (call_frame_t *frame, xlator_t *this,
SET_FS_ID (frame->root->uid, frame->root->gid);
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = -1;
dir = opendir (real_path);
@@ -1025,7 +1031,8 @@ posix_readlink (call_frame_t *frame, xlator_t *this,
if (op_ret == -1) {
op_errno = errno;
gf_log (this->name, GF_LOG_ERROR,
- "lstat on %s failed: %s", real_path,
+ "lstat on %s failed: %s",
+ loc->path ? loc->path : "<null>",
strerror (op_errno));
goto out;
}
@@ -1084,6 +1091,13 @@ posix_mknod (call_frame_t *frame, xlator_t *this,
SET_FS_ID (frame->root->uid, gid);
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
+
+
op_ret = posix_pstat (this, loc->pargfid, par_path, &preparent);
if (op_ret == -1) {
op_errno = errno;
@@ -1276,6 +1290,11 @@ posix_mkdir (call_frame_t *frame, xlator_t *this,
VALIDATE_OR_GOTO (priv, out);
MAKE_ENTRY_HANDLE (real_path, par_path, this, loc, NULL);
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
gid = frame->root->gid;
@@ -1466,6 +1485,11 @@ posix_unlink (call_frame_t *frame, xlator_t *this,
SET_FS_ID (frame->root->uid, frame->root->gid);
MAKE_ENTRY_HANDLE (real_path, par_path, this, loc, &stbuf);
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = posix_pstat (this, loc->pargfid, par_path, &preparent);
if (op_ret == -1) {
@@ -1634,6 +1658,11 @@ posix_rmdir (call_frame_t *frame, xlator_t *this,
priv = this->private;
MAKE_ENTRY_HANDLE (real_path, par_path, this, loc, &stbuf);
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = posix_pstat (this, loc->pargfid, par_path, &preparent);
if (op_ret == -1) {
@@ -1730,6 +1759,11 @@ posix_symlink (call_frame_t *frame, xlator_t *this,
MAKE_ENTRY_HANDLE (real_path, par_path, this, loc, &stbuf);
gid = frame->root->gid;
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
SET_FS_ID (frame->root->uid, gid);
@@ -1874,7 +1908,18 @@ posix_rename (call_frame_t *frame, xlator_t *this,
SET_FS_ID (frame->root->uid, frame->root->gid);
MAKE_ENTRY_HANDLE (real_oldpath, par_oldpath, this, oldloc, NULL);
+ if (!real_oldpath || !par_oldpath) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
+
MAKE_ENTRY_HANDLE (real_newpath, par_newpath, this, newloc, &stbuf);
+ if (!real_newpath || !par_newpath) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = posix_pstat (this, oldloc->pargfid, par_oldpath, &preoldparent);
if (op_ret == -1) {
@@ -2067,8 +2112,17 @@ posix_link (call_frame_t *frame, xlator_t *this,
SET_FS_ID (frame->root->uid, frame->root->gid);
MAKE_INODE_HANDLE (real_oldpath, this, oldloc, &stbuf);
+ if (!real_oldpath) {
+ op_errno = errno;
+ goto out;
+ }
MAKE_ENTRY_HANDLE (real_newpath, par_newpath, this, newloc, &stbuf);
+ if (!real_newpath || !par_newpath) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = posix_pstat (this, newloc->pargfid, par_newpath, &preparent);
if (op_ret == -1) {
@@ -2174,7 +2228,7 @@ posix_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset,
op_errno = errno;
gf_log (this->name, GF_LOG_ERROR,
"pre-operation lstat on %s failed: %s",
- real_path, strerror (op_errno));
+ real_path ? real_path : "<null>", strerror (op_errno));
goto out;
}
@@ -2246,6 +2300,11 @@ posix_create (call_frame_t *frame, xlator_t *this,
gid = frame->root->gid;
SET_FS_ID (frame->root->uid, gid);
+ if (!real_path || !par_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = posix_pstat (this, loc->pargfid, par_path, &preparent);
if (op_ret == -1) {
@@ -2421,6 +2480,11 @@ posix_open (call_frame_t *frame, xlator_t *this,
VALIDATE_OR_GOTO (priv, out);
MAKE_INODE_HANDLE (real_path, this, loc, &stbuf);
+ if (!real_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
if (IA_ISLNK (stbuf.ia_type)) {
op_ret = -1;
@@ -2842,6 +2906,11 @@ posix_statfs (call_frame_t *frame, xlator_t *this,
VALIDATE_OR_GOTO (this->private, out);
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
priv = this->private;
@@ -3116,6 +3185,11 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
VALIDATE_OR_GOTO (dict, out);
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
op_ret = -1;
dict_del (dict, GFID_XATTR_KEY);
@@ -3157,6 +3231,9 @@ posix_xattr_get_real_filename (call_frame_t *frame, xlator_t *this, loc_t *loc,
int op_ret = -1;
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ return -ESTALE;
+ }
fd = opendir (real_path);
if (!fd)
@@ -3375,7 +3452,10 @@ posix_get_ancestry_non_directory (xlator_t *this, inode_t *leaf_inode,
uuid_copy (loc->gfid, leaf_inode->gfid);
MAKE_INODE_HANDLE (leaf_path, this, loc, NULL);
-
+ if (!leaf_path) {
+ GF_FREE (loc);
+ goto out;
+ }
GF_FREE (loc);
size = sys_llistxattr (leaf_path, NULL, 0);
@@ -4217,6 +4297,12 @@ posix_removexattr (call_frame_t *frame, xlator_t *this,
DECLARE_OLD_FS_ID_VAR;
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ op_ret = -1;
+ op_errno = ESTALE;
+ goto out;
+ }
+
if (!strcmp (GFID_XATTR_KEY, name)) {
gf_log (this->name, GF_LOG_WARNING, "Remove xattr called"
@@ -4642,6 +4728,11 @@ posix_access (call_frame_t *frame, xlator_t *this,
VALIDATE_OR_GOTO (loc, out);
MAKE_INODE_HANDLE (real_path, this, loc, NULL);
+ if (!real_path) {
+ op_ret = -1;
+ op_errno = errno;
+ goto out;
+ }
op_ret = access (real_path, mask & 07);
if (op_ret == -1) {
@@ -4887,8 +4978,20 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
if (skip_dirs) {
len = posix_handle_path (this, fd->inode->gfid, NULL, NULL, 0);
+ if (len <= 0) {
+ errno = ESTALE;
+ count = -1;
+ goto out;
+ }
hpath = alloca (len + 256); /* NAME_MAX */
- posix_handle_path (this, fd->inode->gfid, NULL, hpath, len);
+
+ if (posix_handle_path (this, fd->inode->gfid, NULL, hpath,
+ len) <= 0) {
+ errno = ESTALE;
+ count = -1;
+ goto out;
+ }
+
len = strlen (hpath);
hpath[len] = '/';
}
@@ -5033,7 +5136,13 @@ posix_entry_xattr_fill (xlator_t *this, inode_t *inode,
tmp_loc.inode = inode;
MAKE_HANDLE_PATH (entry_path, this, fd->inode->gfid, name);
+ if (!entry_path) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to create handle path for %s (%s)",
+ name, uuid_utoa (fd->inode->gfid));
+ return NULL;
+ }
return posix_lookup_xattr_fill (this, entry_path,
&tmp_loc, dict, stbuf);
@@ -5057,8 +5166,11 @@ posix_readdirp_fill (xlator_t *this, fd_t *fd, gf_dirent_t *entries, dict_t *dic
itable = fd->inode->table;
len = posix_handle_path (this, fd->inode->gfid, NULL, NULL, 0);
+ if (len <= 0)
+ return -1;
hpath = alloca (len + 256); /* NAME_MAX */
- posix_handle_path (this, fd->inode->gfid, NULL, hpath, len);
+ if (posix_handle_path (this, fd->inode->gfid, NULL, hpath, len) <= 0)
+ return -1;
len = strlen (hpath);
hpath[len] = '/';
@@ -5089,7 +5201,8 @@ posix_readdirp_fill (xlator_t *this, fd_t *fd, gf_dirent_t *entries, dict_t *dic
posix_entry_xattr_fill (this, entry->inode,
fd, entry->d_name,
dict, &stbuf);
- dict_ref (entry->dict);
+ if (entry->dict)
+ dict_ref (entry->dict);
}
entry->d_stat = stbuf;