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SELinux: fix array out of bounds when mounting with selinux options 

Given an illegal selinux option it was possible for match_token to work in
random memory at the end of the match_table_t array.

Note that privilege is required to perform a context mount, so this issue is
effectively limited to root only.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2007-09-19 17:19:12 -04:00 committed by James Morris
parent a88a8eff1e
commit 31e8793094
1 changed files with 2 additions and 0 deletions
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2
security/selinux/hooks.c
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@ -316,6 +316,7 @@ static inline int inode_doinit(struct inode *inode)
}
enum {
Opt_error = -1,
Opt_context = 1,
Opt_fscontext = 2,
Opt_defcontext = 4,
@ -327,6 +328,7 @@ static match_table_t tokens = {
{Opt_fscontext, "fscontext=%s"},
{Opt_defcontext, "defcontext=%s"},
{Opt_rootcontext, "rootcontext=%s"},
{Opt_error, NULL},
};
#define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"