Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

[scudo] Reflect the allowed values for M_DECAY_TIME on Android #89114

Merged
merged 1 commit into from
Apr 26, 2024
Merged

[scudo] Reflect the allowed values for M_DECAY_TIME on Android #89114

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 4 additions & 6 deletions compiler-rt/lib/scudo/standalone/wrappers_c.inc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -252,13 +252,11 @@ INTERFACE WEAK int SCUDO_PREFIX(mallopt)(int param, int value) {
// introduced by interval transition.
SCUDO_ALLOCATOR.releaseToOS(scudo::ReleaseToOS::Force);

if (value == 0) {
// Will set the release values to their minimum values.
value = INT32_MIN;
} else {
// Will set the release values to their maximum values.
// The values allowed on Android are {-1, 0, 1}. "1" means the longest
// interval.
CHECK(value >= -1 && value <= 1);
if (value == 1)
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Should this check be value > 0? That more closely matches what it did before.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I'm thinking instead of ">=", maybe we can assert the range of values? given that only three values are valid. (And the description also says 0 and 1 are only allowed numbers)

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

That would be fine with me. We sanitize the values when coming through Android anyway, so verifying a -1, 0, or 1 is probably a better way to do this.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Done. CHECK added.

value = INT32_MAX;
}
}

SCUDO_ALLOCATOR.setOption(scudo::Option::ReleaseInterval,
Expand Down
Loading