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pseudo: Fix xattr segfault

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Fix a NULL pointer dereference exposed by the path ignore code in
xattr handling.

(From OE-Core rev: 929a27bf6cbca94d1141d2094ae0c915d93bd3f4)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
2020-10-01 18:20:06 +01:00
parent 842de9dbba
commit 958447ff2f
2 changed files with 41 additions and 0 deletions
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40
meta/recipes-devtools/pseudo/files/xattr_fix.patch Normal file
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@@ -0,0 +1,40 @@
In the xattr handling functions, if result is NULL, which it can be
with the path ignore code, there is a NULL pointer dereference and
segfault. Everywhere else checks result first, this appears to just
be an omission.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Upstream-Status: Pending
Index: git/ports/linux/xattr/pseudo_wrappers.c
===================================================================
--- git.orig/ports/linux/xattr/pseudo_wrappers.c
+++ git/ports/linux/xattr/pseudo_wrappers.c
@@ -134,7 +134,7 @@ static ssize_t shared_getxattr(const cha
pseudo_debug(PDBGF_XATTR, "getxattr(%s [fd %d], %s)\n",
path ? path : "<no path>", fd, name);
pseudo_msg_t *result = pseudo_client_op(OP_GET_XATTR, 0, fd, -1, path, &buf, name);
- if (result->result != RESULT_SUCCEED) {
+ if (!result || result->result != RESULT_SUCCEED) {
errno = ENOATTR;
return -1;
}
@@ -254,7 +254,7 @@ static int shared_setxattr(const char *p
static ssize_t shared_listxattr(const char *path, int fd, char *list, size_t size) {
RC_AND_BUF
pseudo_msg_t *result = pseudo_client_op(OP_LIST_XATTR, 0, fd, -1, path, &buf);
- if (result->result != RESULT_SUCCEED) {
+ if (!result || result->result != RESULT_SUCCEED) {
pseudo_debug(PDBGF_XATTR, "listxattr: no success.\n");
errno = ENOATTR;
return -1;
@@ -276,7 +276,7 @@ static int shared_removexattr(const char
RC_AND_BUF
pseudo_msg_t *result = pseudo_client_op(OP_REMOVE_XATTR, 0, fd, -1, path, &buf, name);
- if (result->result != RESULT_SUCCEED) {
+ if (!result || result->result != RESULT_SUCCEED) {
/* docs say ENOATTR, but I don't have one */
errno = ENOENT;
return -1;

1
meta/recipes-devtools/pseudo/pseudo_git.bb
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@@ -6,6 +6,7 @@ SRC_URI = "git://git.yoctoproject.org/pseudo;branch=oe-core \
file://add_ignore_paths.patch \
file://abort_on_mismatch.patch \
file://track_link_fds.patch \
file://xattr_fix.patch \
file://fallback-passwd \
file://fallback-group \
"