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security: Add LSM hook to setgroups() syscall

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Give the LSM framework the ability to filter setgroups() syscalls. There
are already analagous hooks for the set*uid() and set*gid() syscalls.
The SafeSetID LSM will use this new hook to ensure setgroups() calls are
allowed by the installed security policy. Tested by putting print
statement in security_task_fix_setgroups() hook and confirming that it
gets hit when userspace does a setgroups() syscall.

Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Micah Morton <mortonm@chromium.org>
This commit is contained in:
Micah Morton
2022-06-08 20:57:11 +00:00
parent a1732d6898
commit fcfe0ac2fc
5 changed files with 33 additions and 0 deletions
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7
include/linux/security.h
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@@ -415,6 +415,7 @@ int security_task_fix_setuid(struct cred *new, const struct cred *old,
int flags);
int security_task_fix_setgid(struct cred *new, const struct cred *old,
int flags);
int security_task_fix_setgroups(struct cred *new, const struct cred *old);
int security_task_setpgid(struct task_struct *p, pid_t pgid);
int security_task_getpgid(struct task_struct *p);
int security_task_getsid(struct task_struct *p);
@@ -1098,6 +1099,12 @@ static inline int security_task_fix_setgid(struct cred *new,
return 0;
}
static inline int security_task_fix_setgroups(struct cred *new,
const struct cred *old)
{
return 0;
}
static inline int security_task_setpgid(struct task_struct *p, pid_t pgid)
{
return 0;