pezkuwichain/revive
1
0
Fork 0
mirror of https://github.com/pezkuwichain/revive.git synced 2026-04-27 20:57:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

llvm-context: do not trap zero length OOB heap access (#389)

Browse Source 
Fixes https://github.com/paritytech/contract-issues/issues/120

---------

Signed-off-by: xermicus <cyrill@parity.io>
This commit is contained in:
xermicus
2025-10-15 22:39:42 +02:00
committed by GitHub
parent 2090830858
commit f46bea6a96
8 changed files with 62 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/llvm-context/src/polkavm/context/function/runtime/sbrk.rs
+11 -1
View File
@@ -47,6 +47,17 @@ impl RuntimeFunction for Sbrk {
let offset = Self::paramater(context, 0).into_int_value();
let size = Self::paramater(context, 1).into_int_value();
let return_block = context.append_basic_block("return_pointer");
let body_block = context.append_basic_block("body");
let is_size_zero = context.builder().build_int_compare(
inkwell::IntPredicate::EQ,
size,
context.xlen_type().const_zero(),
"is_size_zero",
)?;
context.build_conditional_branch(is_size_zero, return_block, body_block)?;
context.set_basic_block(body_block);
let trap_block = context.append_basic_block("trap");
let offset_in_bounds_block = context.append_basic_block("offset_in_bounds");
let is_offset_out_of_bounds = context.builder().build_int_compare(
@@ -91,7 +102,6 @@ impl RuntimeFunction for Sbrk {
)?;
context.set_basic_block(size_in_bounds_block);
let return_block = context.append_basic_block("return_pointer");
let new_size_block = context.append_basic_block("new_size");
let is_new_size = context.builder().build_int_compare(
inkwell::IntPredicate::UGT,