100 lines
3.7 KiB
Diff
100 lines
3.7 KiB
Diff
From efe0be279901006f939cd357ccee47b651c786da Mon Sep 17 00:00:00 2001
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From: Seebs <seebs@seebs.net>
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Date: Fri, 24 Feb 2017 12:47:38 -0600
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Subject: Don't try to record 0-length posix_acl_default xattrs
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Based on a submission from Anton Gerasimov <anton@advancedtelematic.com>
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On some systems, with some kernel configs, "cp -a" apparently tries to
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set an empty ACL list, with a valid header but no contents, which causes
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strange and mysterious behavior later if we actually create such an entry.
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So filter that out, also sanity-check a couple of other things.
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Signed-off-by: Seebs <seebs@seebs.net>
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Upstream-Status: Backport
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diff --git a/ChangeLog.txt b/ChangeLog.txt
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index ae2a6e9..a2d30e9 100644
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--- a/ChangeLog.txt
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+++ b/ChangeLog.txt
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@@ -1,3 +1,6 @@
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+2017-02-24:
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+ * (seebs) import posix_acl_default fix from Anton Gerasimov
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+ <anton@advancedtelematic.com>
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2017-02-01:
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* (seebs) handle xattr deletion slightly more carefully.
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* (seebs) tag this as 1.8.2
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diff --git a/ports/linux/xattr/pseudo_wrappers.c b/ports/linux/xattr/pseudo_wrappers.c
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index 46bc053..d69d53e 100644
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--- a/ports/linux/xattr/pseudo_wrappers.c
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+++ b/ports/linux/xattr/pseudo_wrappers.c
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@@ -62,9 +62,9 @@ static int
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posix_permissions(const acl_header *header, int entries, int *extra, int *mode) {
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int acl_seen = 0;
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if (le32(header->version) != 2) {
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- pseudo_diag("Fatal: ACL support no available for header version %d.\n",
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+ pseudo_diag("Fatal: ACL support not available for header version %d.\n",
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le32(header->version));
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- return 1;
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+ return -1;
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}
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*mode = 0;
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*extra = 0;
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@@ -140,12 +140,38 @@ static int shared_setxattr(const char *path, int fd, const char *name, const voi
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pseudo_debug(PDBGF_XATTR, "setxattr(%s [fd %d], %s => '%.*s')\n",
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path ? path : "<no path>", fd, name, (int) size, (char *) value);
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+ /* Filter out erroneous sizes for POSIX ACL
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+ * see posix_acl_xattr_count in include/linux/posix_acl_xattr.h of Linux source code */
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+ /* I don't think there's any posix_acl_* values that aren't in this format */
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+ if (!strncmp(name, "system.posix_acl_", 17)) {
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+ // ACL is corrupt, issue an error
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+ if(size < sizeof(acl_header) || (size - sizeof(acl_header)) % sizeof(acl_entry) != 0) {
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+ pseudo_debug(PDBGF_XATTR, "invalid data size for %s: %d\n",
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+ name, (int) size);
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+ errno = EINVAL;
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+ return -1;
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+ }
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+
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+ // ACL is empty, do nothing
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+ if((size - sizeof(acl_header)) / sizeof(acl_entry) == 0) {
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+ /* on some systems, "cp -a" will attempt to clone the
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+ * posix_acl_default entry for a directory (which would specify
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+ * default ACLs for new files in that directory), but if the
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+ * original was empty, we get a header but no entries. With
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+ * real xattr, that ends up being silently discarded, apparently,
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+ * so we discard it too.
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+ */
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+ pseudo_debug(PDBGF_XATTR, "0-length ACL entry %s.\n", name);
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+ return 0;
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+ }
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+ }
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/* this may be a plain chmod */
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if (!strcmp(name, "system.posix_acl_access")) {
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int extra;
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int mode;
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int entries = (size - sizeof(acl_header)) / sizeof(acl_entry);
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- if (!posix_permissions(value, entries, &extra, &mode)) {
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+ int res = posix_permissions(value, entries, &extra, &mode);
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+ if (res == 0) {
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pseudo_debug(PDBGF_XATTR, "posix_acl_access translated to mode %04o. Remaining attribute(s): %d.\n",
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mode, extra);
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buf.st_mode = mode;
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@@ -164,8 +190,12 @@ static int shared_setxattr(const char *path, int fd, const char *name, const voi
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if (!extra) {
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return 0;
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}
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+ } else if (res == -1) {
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+ errno = EOPNOTSUPP;
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+ return -1;
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}
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}
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+
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if (!strcmp(name, "user.pseudo_data")) {
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pseudo_debug(PDBGF_XATTR | PDBGF_XATTRDB, "user.pseudo_data xattribute does not get to go in database.\n");
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return -1;
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--
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cgit v0.10.2
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