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Restore datetime C-API test execution
When _testcapi is now importable but lacks test_datetime_capi, this unconditional class decorator suppresses every fast datetime C-API test instead of retaining executable failure coverage, so later partial implementations cannot expose regressions or unexpected passes. Implement the setup helper/Rust functionality rather than skipping the entire class; repository policy reserves skips for tests that would crash, abort, or hang the test process.
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Reject oversized location varints before shifting
Under -X no_debug_ranges, CodeType construction and code.replace(co_linetable=...) now send user-supplied linetables through this scanner; a NoColumns or Long payload with seven 0x40 continuation bytes advances shift past 31 and panics in dev/test builds instead of returning a Python error. Bound the number of chunks or reject an oversized varint before performing the shift.
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sed -n '145,215p' crates/compiler-core/src/bytecode.rs
sed -n '640,665p' crates/vm/src/builtins/code.rs
rg -n 'remove_column_info|co_linetable|linetable_to_locations' crates/vm/src/builtins/code.rs
Repository: RustPython/RustPython
Length of output: 4493
🏁 Script executed:
set -o pipefail
printf'%s\n''--- scan_varint callers and definitions ---'
rg -n -F --glob '*.rs' -e 'scan_varint' -e 'get_line_delta' -e 'remove_column_info' crates/compiler-core/src/bytecode.rs crates/vm/src/builtins/code.rs
printf'%s\n''--- code constructor and replace blocks ---'
sed -n '1120,1210p' crates/vm/src/builtins/code.rs
sed -n '1680,1785p' crates/vm/src/builtins/code.rs
printf'%s\n''--- linetable parsing and validation ---'
rg -n -F --glob '*.rs' -e 'linetable_to_locations' -e 'PyCodeLocationInfoKind' -e 'locations' crates/compiler-core/src/marshal.rs crates/compiler-core/src/bytecode.rs crates/vm/src/builtins/code.rs | head -160
sed -n '1,145p' crates/compiler-core/src/bytecode.rs
sed -n '1,180p' crates/compiler-core/src/marshal.rs
printf'%s\n''--- tests mentioning no_debug_ranges or malformed linetables ---'
rg -n -F --glob '*.py' --glob '*.rs' -e 'no_debug_ranges' -e 'co_linetable' -e 'linetable' tests stdlib crates | head -220
Repository: RustPython/RustPython
Length of output: 39177
🏁 Script executed:
set -o pipefail
printf'%s\n''--- code() signature and argument definitions ---'
sed -n '1000,1075p' crates/vm/src/builtins/code.rs
sed -n '1560,1620p' crates/vm/src/builtins/code.rs
printf'%s\n''--- linetable_to_locations complete implementation ---'
sed -n '1735,1870p' crates/compiler-core/src/marshal.rs
printf'%s\n''--- linetable varint readers/writers ---'
rg -n -F --glob '*.rs' -e 'fn lt_read_varint' -e 'fn lt_read_signed_varint' -e 'fn lt_byte' -e 'pub fn write_signed_varint' -e 'pub fn write_varint' crates/compiler-core/src
sed -n '1,145p' crates/compiler-core/src/varint.rs
sed -n '1810,1855p' crates/compiler-core/src/marshal.rs
printf'%s\n''--- code_debug_ranges setting and tests ---'
sed -n '45,80p' crates/vm/src/vm/setting.rs
rg -n -F --glob '*.py' --glob '*.rs' -e 'code.replace' -e 'co_linetable=' -e 'CodeType(' -e 'no_debug_ranges' tests crates | head -220
Repository: RustPython/RustPython
Length of output: 17248
Bound scan_varint before the next shift.
code() and code.replace() accept unvalidated co_linetable bytes. With no_debug_ranges, six continuation bytes can make scan_varint evaluate a u32 shift by 36. Check the bound and stop decoding. Checking only the shift expression still allows shift to keep growing on longer inputs.
Suggested fix
while read & 64 != 0 {
read = iter.next().copied().unwrap_or(0);
shift += 6;
+ if shift >= 32 {+ break;+ }
val |= u32::from(read & 63) << shift;
}
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Suggested change
fn scan_varint(data:&[u8]) -> u32{
letmut iter = data.iter();
letmut read = iter.next().copied().unwrap_or(0);
letmut val = u32::from(read &63);
letmut shift = 0;
while read &64 != 0{
read = iter.next().copied().unwrap_or(0);
shift += 6;
val |= u32::from(read &63) << shift;
}
fn scan_varint(data:&[u8]) -> u32{
letmut iter = data.iter();
letmut read = iter.next().copied().unwrap_or(0);
letmut val = u32::from(read &63);
letmut shift = 0;
while read &64 != 0{
read = iter.next().copied().unwrap_or(0);
shift += 6;
if shift >= 32{
break;
}
val |= u32::from(read &63) << shift;
}
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Review comment at @crates/compiler-core/src/bytecode.rs around lines 150 - 159:
Update scan_varint to stop decoding when the next six-bit group would shift by
32 or more: check the incremented shift before applying it to val, and break
immediately when out of range so longer inputs cannot keep increasing shift.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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val
}
/// scan_signed_varint
fn scan_signed_varint(data: &[u8]) -> i32 {
let uval = scan_varint(data);
if uval & 1 != 0 {
-((uval >> 1) as i32)
} else {
(uval >> 1) as i32
}
}
/// get_line_delta
fn get_line_delta(entry: &[u8]) -> i32 {
match PyCodeLocationInfoKind::from_code((entry[0] >> 3) & 15) {
/// Parse linetable to build a boolean mask indicating which code units
/// have NO_LOCATION (line == -1). Returns a Vec<bool> of length `num_units`.
#[must_use]
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