From: Song Liu <songliubraving@fb.com>
Date: Fri, 2 Nov 2018 10:16:16 -0700
Subject: bpf: show real jited address in bpf_prog_info->jited_ksyms
Patch-mainline: v4.20-rc2
Git-commit: de57e99ceb65d0d7775cc14a8ba5931d7de1d708
References: bsc#1109837

Currently, jited_ksyms in bpf_prog_info shows page addresses of jited
bpf program. The main reason here is to not expose randomized start
address. However, this is not ideal for detailed profiling (find hot
instructions from stack traces). This patch replaces the page address
with real prog start address.

This change is OK because bpf_prog_get_info_by_fd() is only available
to root.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/syscall.c |    1 -
 1 file changed, 1 deletion(-)

--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2000,7 +2000,6 @@ static int bpf_prog_get_info_by_fd(struc
 			user_ksyms = u64_to_user_ptr(info.jited_ksyms);
 			for (i = 0; i < ulen; i++) {
 				ksym_addr = (ulong) prog->aux->func[i]->bpf_func;
-				ksym_addr &= PAGE_MASK;
 				if (put_user((u64) ksym_addr, &user_ksyms[i]))
 					return -EFAULT;
 			}