leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

s390/bpf: Remove JITed image size limitations

Browse Source 
Now that jump and long displacement ranges are no longer a problem,
remove the limit on JITed image size. In practice it's still limited by
2G, but with verifier allowing "only" 1M instructions, it's not an
issue.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191118180340.68373-7-iii@linux.ibm.com
This commit is contained in:
Ilya Leoshkevich 2019-11-18 19:03:40 +01:00 committed by Alexei Starovoitov
parent b25c57b6b7
commit d1242b10ff
1 changed files with 0 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/s390/net/bpf_jit_comp.c
View File

@ -52,8 +52,6 @@ struct bpf_jit {
int labels[1]; /* Labels for local jumps */
};
#define BPF_SIZE_MAX 0xffff /* Max size for program (16 bit branches) */
#define SEEN_MEM BIT(0) /* use mem[] for temporary storage */
#define SEEN_LITERAL BIT(1) /* code uses literals */
#define SEEN_FUNC BIT(2) /* calls C functions */
@ -1631,11 +1629,6 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
/*
* Final pass: Allocate and generate program
*/
if (jit.size >= BPF_SIZE_MAX) {
fp = orig_fp;
goto free_addrs;
}
header = bpf_jit_binary_alloc(jit.size, &jit.prg_buf, 8, jit_fill_hole);
if (!header) {
fp = orig_fp;