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b030ffaedc
The `cred` field in task_struct is currently marked as __rcu, but that's not true: It can point to credentials from access_override_creds(), which do not get freed with RCU delay. What actually protects task_struct::cred is that accessing it is only permitted for the current task (except for setting up a child during fork() or tearing down a dead process). (There is currently code in Smack that violates this rule, but that's a bug and causes UAF, I have sent a separate fix for that.) Clarify this, remove the __rcu marker, and remove RCU helpers from all accesses to this field. Signed-off-by: Jann Horn <jannh@google.com> Reviewed-by: Serge Hallyn <serge@hallyn.com> [PM: style tweak in security_init(), applied fixup from JH] Signed-off-by: Paul Moore <paul@paul-moore.com> |
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| .. | ||
| .gitignore | ||
| .kunitconfig | ||
| calibrate.c | ||
| do_mounts_initrd.c | ||
| do_mounts_rd.c | ||
| do_mounts.c | ||
| do_mounts.h | ||
| init_task.c | ||
| initramfs_internal.h | ||
| initramfs_test.c | ||
| initramfs.c | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| noinitramfs.c | ||
| version-timestamp.c | ||
| version.c | ||