openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

selinux: Fix an uninitialized variable BUG/panic in selinux_secattr_to_sid() 

At some point during the 2.6.27 development cycle two new fields were added
to the SELinux context structure, a string pointer and a length field.  The
code in selinux_secattr_to_sid() was not modified and as a result these two
fields were left uninitialized which could result in erratic behavior,
including kernel panics, when NetLabel is used.  This patch fixes the
problem by fully initializing the context in selinux_secattr_to_sid() before
use and reducing the level of direct context manipulation done to help
prevent future problems.

Please apply this to the 2.6.27-rcX release stream.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2008-10-03 10:51:15 -04:00 committed by James Morris
parent ea6b184f7d
commit 81990fbdd1
1 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
security/selinux/ss/services.c
View File

@ -2907,6 +2907,7 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
if (ctx == NULL)
goto netlbl_secattr_to_sid_return;
context_init(&ctx_new);
ctx_new.user = ctx->user;
ctx_new.role = ctx->role;
ctx_new.type = ctx->type;
@ -2915,13 +2916,9 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
secattr->attr.mls.cat) != 0)
goto netlbl_secattr_to_sid_return;
ctx_new.range.level[1].cat.highbit =
ctx_new.range.level[0].cat.highbit;
ctx_new.range.level[1].cat.node =
ctx_new.range.level[0].cat.node;
} else {
ebitmap_init(&ctx_new.range.level[0].cat);
ebitmap_init(&ctx_new.range.level[1].cat);
memcpy(&ctx_new.range.level[1].cat,
&ctx_new.range.level[0].cat,
sizeof(ctx_new.range.level[0].cat));
}
if (mls_context_isvalid(&policydb, &ctx_new) != 1)
goto netlbl_secattr_to_sid_return_cleanup;