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ipc: Store ipc sysctls in the ipc namespace

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The ipc sysctls are not available for modification inside the user
namespace. Following the mqueue sysctls, we changed the implementation
to be more userns friendly.

So far, the changes do not provide additional access to files. This
will be done in a future patch.

Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/be6f9d014276f4dddd0c3aa05a86052856c1c555.1644862280.git.legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Alexey Gladkov
2022-02-14 19:18:15 +01:00
committed by Eric W. Biederman
parent dc55e35f9e
commit 1f5c135ee5
3 changed files with 151 additions and 71 deletions
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21
include/linux/ipc_namespace.h
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@@ -67,6 +67,9 @@ struct ipc_namespace {
struct ctl_table_set mq_set;
struct ctl_table_header *mq_sysctls;
struct ctl_table_set ipc_set;
struct ctl_table_header *ipc_sysctls;
/* user_ns which owns the ipc ns */
struct user_namespace *user_ns;
struct ucounts *ucounts;
@@ -188,4 +191,22 @@ static inline bool setup_mq_sysctls(struct ipc_namespace *ns)
}
#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
#ifdef CONFIG_SYSVIPC_SYSCTL
bool setup_ipc_sysctls(struct ipc_namespace *ns);
void retire_ipc_sysctls(struct ipc_namespace *ns);
#else /* CONFIG_SYSVIPC_SYSCTL */
static inline void retire_ipc_sysctls(struct ipc_namespace *ns)
{
}
static inline bool setup_ipc_sysctls(struct ipc_namespace *ns)
{
return true;
}
#endif /* CONFIG_SYSVIPC_SYSCTL */
#endif