tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>

authored by

Eric Paris and committed by
James Morris 31e87930 a88a8eff

+2
+2
security/selinux/hooks.c
··· 316 316 } 317 317 318 318 enum { 319 + Opt_error = -1, 319 320 Opt_context = 1, 320 321 Opt_fscontext = 2, 321 322 Opt_defcontext = 4, ··· 328 327 {Opt_fscontext, "fscontext=%s"}, 329 328 {Opt_defcontext, "defcontext=%s"}, 330 329 {Opt_rootcontext, "rootcontext=%s"}, 330 + {Opt_error, NULL}, 331 331 }; 332 332 333 333 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"