Re: [PATCH 1/3] XFRM: Assorted IPsec fixups

James Morris
2007-12-20T22:27:36Z

On Thu, 20 Dec 2007, Paul Moore wrote:

> This patch fixes a number of small but potentially troublesome things in the
> XFRM/IPsec code:
>
> * Use the 'audit_enabled' variable already in include/linux/audit.h
> Removed the need for extern declarations local to each XFRM audit fuction
>
> * Convert 'sid' to 'secid' everywhere we can
> The 'sid' name is specific to SELinux, 'secid' is the common naming
> convention used by the kernel when refering to tokenized LSM labels,
> unfortunately we have to leave 'ctx_sid' in 'struct xfrm_sec_ctx' otherwise
> we risk breaking userspace
>
> * Convert address display to use standard NIP* macros
> Similar to what was recently done with the SPD audit code, this also also
> includes the removal of some unnecessary memcpy() calls
>
> * Move common code to xfrm_audit_common_stateinfo()
> Code consolidation from the "less is more" book on software development
>
> * Proper spacing around commas in function arguments
> Minor style tweak since I was already touching the code
>
> Signed-off-by: Paul Moore <paul.moore@hp.com>

Acked-by: James Morris <jmorris@namei.org>

> ---
>
> include/net/xfrm.h | 14 ++++++-------
> net/xfrm/xfrm_policy.c | 15 ++++++--------
> net/xfrm/xfrm_state.c | 53 ++++++++++++++++++++----------------------------
> 3 files changed, 36 insertions(+), 46 deletions(-)
>
> diff --git a/include/net/xfrm.h b/include/net/xfrm.h
> index 32b99e2..ac6cf09 100644
> --- a/include/net/xfrm.h
> +++ b/include/net/xfrm.h
> @@ -548,7 +548,7 @@ struct xfrm_audit
> };
>
> #ifdef CONFIG_AUDITSYSCALL
> -static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
> +static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 secid)
> {
> struct audit_buffer *audit_buf = NULL;
> char *secctx;
> @@ -561,8 +561,8 @@ static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
>
> audit_log_format(audit_buf, "auid=%u", auid);
>
> - if (sid != 0 &&
> - security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
> + if (secid != 0 &&
> + security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
> audit_log_format(audit_buf, " subj=%s", secctx);
> security_release_secctx(secctx, secctx_len);
> } else
> @@ -571,13 +571,13 @@ static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
> }
>
> extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
> - u32 auid, u32 sid);
> + u32 auid, u32 secid);
> extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
> - u32 auid, u32 sid);
> + u32 auid, u32 secid);
> extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
> - u32 auid, u32 sid);
> + u32 auid, u32 secid);
> extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
> - u32 auid, u32 sid);
> + u32 auid, u32 secid);
> #else
> #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
> #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
> diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
> index d2084b1..c8f0656 100644
> --- a/net/xfrm/xfrm_policy.c
> +++ b/net/xfrm/xfrm_policy.c
> @@ -24,6 +24,7 @@
> #include <linux/netfilter.h>
> #include <linux/module.h>
> #include <linux/cache.h>
> +#include <linux/audit.h>
> #include <net/dst.h>
> #include <net/xfrm.h>
> #include <net/ip.h>
> @@ -2317,15 +2318,14 @@ static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
> }
> }
>
> -void
> -xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
> +void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
> + u32 auid, u32 secid)
> {
> struct audit_buffer *audit_buf;
> - extern int audit_enabled;
>
> if (audit_enabled == 0)
> return;
> - audit_buf = xfrm_audit_start(sid, auid);
> + audit_buf = xfrm_audit_start(auid, secid);
> if (audit_buf == NULL)
> return;
> audit_log_format(audit_buf, " op=SPD-add res=%u", result);
> @@ -2334,15 +2334,14 @@ xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
> }
> EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
>
> -void
> -xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
> +void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
> + u32 auid, u32 secid)
> {
> struct audit_buffer *audit_buf;
> - extern int audit_enabled;
>
> if (audit_enabled == 0)
> return;
> - audit_buf = xfrm_audit_start(sid, auid);
> + audit_buf = xfrm_audit_start(auid, secid);
> if (audit_buf == NULL)
> return;
> audit_log_format(audit_buf, " op=SPD-delete res=%u", result);
> diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
> index 95df01c..dd38e6f 100644
> --- a/net/xfrm/xfrm_state.c
> +++ b/net/xfrm/xfrm_state.c
> @@ -19,6 +19,7 @@
> #include <linux/ipsec.h>
> #include <linux/module.h>
> #include <linux/cache.h>
> +#include <linux/audit.h>
> #include <asm/uaccess.h>
>
> #include "xfrm_hash.h"
> @@ -1996,69 +1997,59 @@ void __init xfrm_state_init(void)
> static inline void xfrm_audit_common_stateinfo(struct xfrm_state *x,
> struct audit_buffer *audit_buf)
> {
> - if (x->security)
> + struct xfrm_sec_ctx *ctx = x->security;
> + u32 spi = ntohl(x->id.spi);
> +
> + if (ctx)
> audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
> - x->security->ctx_alg, x->security->ctx_doi,
> - x->security->ctx_str);
> + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
>
> switch(x->props.family) {
> case AF_INET:
> - audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
> + audit_log_format(audit_buf,
> + " src=" NIPQUAD_FMT " dst=" NIPQUAD_FMT,
> NIPQUAD(x->props.saddr.a4),
> NIPQUAD(x->id.daddr.a4));
> break;
> case AF_INET6:
> - {
> - struct in6_addr saddr6, daddr6;
> -
> - memcpy(&saddr6, x->props.saddr.a6,
> - sizeof(struct in6_addr));
> - memcpy(&daddr6, x->id.daddr.a6,
> - sizeof(struct in6_addr));
> - audit_log_format(audit_buf,
> - " src=" NIP6_FMT " dst=" NIP6_FMT,
> - NIP6(saddr6), NIP6(daddr6));
> - }
> + audit_log_format(audit_buf,
> + " src=" NIP6_FMT " dst=" NIP6_FMT,
> + NIP6(*(struct in6_addr *)x->props.saddr.a6),
> + NIP6(*(struct in6_addr *)x->id.daddr.a6));
> break;
> }
> +
> + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
> }
>
> -void
> -xfrm_audit_state_add(struct xfrm_state *x, int result, u32 auid, u32 sid)
> +void xfrm_audit_state_add(struct xfrm_state *x, int result,
> + u32 auid, u32 secid)
> {
> struct audit_buffer *audit_buf;
> - u32 spi;
> - extern int audit_enabled;
>
> if (audit_enabled == 0)
> return;
> - audit_buf = xfrm_audit_start(sid, auid);
> + audit_buf = xfrm_audit_start(auid, secid);
> if (audit_buf == NULL)
> return;
> - audit_log_format(audit_buf, " op=SAD-add res=%u",result);
> + audit_log_format(audit_buf, " op=SAD-add res=%u", result);
> xfrm_audit_common_stateinfo(x, audit_buf);
> - spi = ntohl(x->id.spi);
> - audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
> audit_log_end(audit_buf);
> }
> EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
>
> -void
> -xfrm_audit_state_delete(struct xfrm_state *x, int result, u32 auid, u32 sid)
> +void xfrm_audit_state_delete(struct xfrm_state *x, int result,
> + u32 auid, u32 secid)
> {
> struct audit_buffer *audit_buf;
> - u32 spi;
> - extern int audit_enabled;
>
> if (audit_enabled == 0)
> return;
> - audit_buf = xfrm_audit_start(sid, auid);
> + audit_buf = xfrm_audit_start(auid, secid);
> if (audit_buf == NULL)
> return;
> - audit_log_format(audit_buf, " op=SAD-delete res=%u",result);
> + audit_log_format(audit_buf, " op=SAD-delete res=%u", result);
> xfrm_audit_common_stateinfo(x, audit_buf);
> - spi = ntohl(x->id.spi);
> - audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
> audit_log_end(audit_buf);
> }
> EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
>
> --
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--
James Morris
<jmorris@namei.org>