From c4823bce033be74c0fcfbcae2f1be0854fdc2e18 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 12 Mar 2007 16:17:42 +0000 Subject: [PATCH] [PATCH] fix deadlock in audit_log_task_context() GFP_KERNEL allocations in non-blocking context; fixed by killing an idiotic use of security_getprocattr(). Acked-by: Stephen Smalley Acked-by: James Morris Signed-off-by: Al Viro Signed-off-by: Linus Torvalds --- kernel/auditsc.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 359955800d..628c7ac590 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -739,28 +739,26 @@ static inline void audit_free_context(struct audit_context *context) void audit_log_task_context(struct audit_buffer *ab) { char *ctx = NULL; - ssize_t len = 0; + unsigned len; + int error; + u32 sid; + + selinux_get_task_sid(current, &sid); + if (!sid) + return; - len = security_getprocattr(current, "current", NULL, 0); - if (len < 0) { - if (len != -EINVAL) + error = selinux_sid_to_string(sid, &ctx, &len); + if (error) { + if (error != -EINVAL) goto error_path; return; } - ctx = kmalloc(len, GFP_KERNEL); - if (!ctx) - goto error_path; - - len = security_getprocattr(current, "current", ctx, len); - if (len < 0 ) - goto error_path; - audit_log_format(ab, " subj=%s", ctx); + kfree(ctx); return; error_path: - kfree(ctx); audit_panic("error in audit_log_task_context"); return; } -- 2.39.5