/*
 * Common values for serpent algorithms
 */

#ifndef _CRYPTO_SERPENT_H
#define _CRYPTO_SERPENT_H

#include <linux/types.h>
#include <linux/crypto.h>

#define SERPENT_MIN_KEY_SIZE		  0
#define SERPENT_MAX_KEY_SIZE		 32
#define SERPENT_EXPKEY_WORDS		132
#define SERPENT_BLOCK_SIZE		 16

struct serpent_ctx {
	u32 expkey[SERPENT_EXPKEY_WORDS];
};

int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
		     unsigned int keylen);
int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen);

void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src);
void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src);

#endif
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<tr><th>author</th><td>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2012-12-28 18:58:39 -0800</td></tr>
<tr><th>committer</th><td>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2013-01-26 22:11:41 -0800</td></tr>
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<div class='commit-subject'>userns: Avoid recursion in put_user_ns</div><div class='commit-msg'>When freeing a deeply nested user namespace free_user_ns calls
put_user_ns on it's parent which may in turn call free_user_ns again.
When -fno-optimize-sibling-calls is passed to gcc one stack frame per
user namespace is left on the stack, potentially overflowing the
kernel stack.  CONFIG_FRAME_POINTER forces -fno-optimize-sibling-calls
so we can't count on gcc to optimize this code.

Remove struct kref and use a plain atomic_t.  Making the code more
flexible and easier to comprehend.  Make the loop in free_user_ns
explict to guarantee that the stack does not overflow with
CONFIG_FRAME_POINTER enabled.

I have tested this fix with a simple program that uses unshare to
create a deeply nested user namespace structure and then calls exit.
With 1000 nesteuser namespaces before this change running my test
program causes the kernel to die a horrible death.  With 10,000,000
nested user namespaces after this change my test program runs to
completion and causes no harm.

Acked-by: Serge Hallyn &lt;serge.hallyn@canonical.com&gt;
Pointed-out-by: Vasily Kulikov &lt;segoon@openwall.com&gt;
Signed-off-by: "Eric W. Biederman" &lt;ebiederm@xmission.com&gt;
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