diff mbox series

[bpf-next,v3,1/6] bpf: Unify data extension operation of jited_ksyms and jited_linfo

Message ID 20220530092815.1112406-2-pulehui@huawei.com (mailing list archive)
State New, archived
Headers show
Series Support riscv jit to provide | expand

Commit Message

Pu Lehui May 30, 2022, 9:28 a.m. UTC 
We found that 32-bit environment can not print bpf line info due
to data inconsistency between jited_ksyms[0] and jited_linfo[0].

For example:
jited_kyms[0] = 0xb800067c, jited_linfo[0] = 0xffffffffb800067c

We know that both of them store bpf func address, but due to the
different data extension operations when extended to u64, they may
not be the same. We need to unify the data extension operations of
them.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
 kernel/bpf/syscall.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index e0aead17dff4..2929a4aab82c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -4095,14 +4095,15 @@  static int bpf_prog_get_info_by_fd(struct file *file,
 		info.nr_jited_line_info = 0;
 	if (info.nr_jited_line_info && ulen) {
 		if (bpf_dump_raw_ok(file->f_cred)) {
+			unsigned long ladd;
 			__u64 __user *user_linfo;
 			u32 i;
 
 			user_linfo = u64_to_user_ptr(info.jited_line_info);
 			ulen = min_t(u32, info.nr_jited_line_info, ulen);
 			for (i = 0; i < ulen; i++) {
-				if (put_user((__u64)(long)prog->aux->jited_linfo[i],
-					     &user_linfo[i]))
+				ladd = (unsigned long)prog->aux->jited_linfo[i];
+				if (put_user((__u64)ladd, &user_linfo[i]))
 					return -EFAULT;
 			}
 		} else {