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[1/2] tools, bpf_asm: Hard error on out of range jumps.

Message ID a6b6c7516f5d559049d669968e953b4a8d7adea3.1614201868.git.ian@zenhack.net
State Superseded
Headers show
Series More strict error checking in bpf_asm (v3). | expand

Commit Message

Ian Denhardt Feb. 24, 2021, 2:15 a.m. UTC 
Per discussion at:

https://lore.kernel.org/bpf/c964892195a6b91d20a67691448567ef528ffa6d.camel@linux.ibm.com/T/#t

...this was originally introduced as a warning due to concerns about
breaking existing code, but a hard error probably makes more sense,
especially given that concerns about breakage were only speculation.

Signed-off-by: Ian Denhardt <ian@zenhack.net>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tools/bpf/bpf_exp.y | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/tools/bpf/bpf_exp.y b/tools/bpf/bpf_exp.y
index 8d48e896be50..8d03e5245da5 100644
--- a/tools/bpf/bpf_exp.y
+++ b/tools/bpf/bpf_exp.y
@@ -549,9 +549,11 @@  static uint8_t bpf_encode_jt_jf_offset(int off, int i)
 {
 	int delta = off - i - 1;
 
-	if (delta < 0 || delta > 255)
-		fprintf(stderr, "warning: insn #%d jumps to insn #%d, "
+	if (delta < 0 || delta > 255) {
+		fprintf(stderr, "error: insn #%d jumps to insn #%d, "
 				"which is out of range\n", i, off);
+		exit(1);
+	}
 	return (uint8_t) delta;
 }