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audit: don't deref the syscall args when checking the openat2 open_how::flags

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As reported by Jeff, dereferencing the openat2 syscall argument in
audit_match_perm() to obtain the open_how::flags can result in an
oops/page-fault.  This patch fixes this by using the open_how struct
that we store in the audit_context with audit_openat2_how().

Independent of this patch, Richard Guy Briggs posted a similar patch
to the audit mailing list roughly 40 minutes after this patch was
posted.

Cc: stable@vger.kernel.org
Fixes: 1c30e3af8a ("audit: add support for the openat2 syscall")
Reported-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2022-02-09 14:49:38 -05:00
parent f26d043313
commit 7a82f89de9
1 changed files with 1 additions and 1 deletions
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2
kernel/auditsc.c
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@ -185,7 +185,7 @@ static int audit_match_perm(struct audit_context *ctx, int mask)
case AUDITSC_EXECVE:
return mask & AUDIT_PERM_EXEC;
case AUDITSC_OPENAT2:
return mask & ACC_MODE((u32)((struct open_how *)ctx->argv[2])->flags);
return mask & ACC_MODE((u32)ctx->openat2.flags);
default:
return 0;
}