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namei: make may_follow_link() safe in RCU mode
We *can't* call that audit garbage in RCU mode - it's doing a weird mix of allocations (GFP_NOFS, immediately followed by GFP_KERNEL) and I'm not touching that... thing again. So if this security sclero^Whardening feature gets triggered when we are in RCU mode, tough - we'll fail with -ECHILD and have everything restarted in non-RCU mode. Only to hit the same test and fail, this time with EACCES and with (oh, rapture) an audit spew produced. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -794,6 +794,9 @@ static inline int may_follow_link(struct nameidata *nd)
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if (uid_eq(parent->i_uid, inode->i_uid))
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return 0;
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if (nd->flags & LOOKUP_RCU)
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return -ECHILD;
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audit_log_link_denied("follow_link", &nd->stack[0].link);
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return -EACCES;
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}
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