Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

gh-134070: Prevent out-of-bounds read in mi_clz32 and mi_ctz32#134149

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.

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

Already on GitHub?Sign in to your account

Open
vedant713 wants to merge6 commits intopython:main
base:main
Choose a base branch
Loading
fromvedant713:fix-mimalloc-bug
Open
Show file tree
Hide file tree
Changes fromall commits
Commits
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
6 changes: 4 additions & 2 deletionsInclude/internal/mimalloc/mimalloc/internal.h
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -851,7 +851,8 @@ static inline size_t mi_ctz32(uint32_t x) {
31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
};
if (x==0) return 32;
return debruijn[((x & -(int32_t)x) * 0x077CB531UL) >> 27];
return debruijn[(uint32_t)(((x & -(int32_t)x) * 0x077CB531UL) >> 27) & 31];

}
static inline size_t mi_clz32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
Expand All@@ -865,7 +866,8 @@ static inline size_t mi_clz32(uint32_t x) {
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return debruijn[(uint32_t)(x * 0x07C4ACDDUL) >> 27];
return debruijn[(uint32_t)(x * 0x07C4ACDDUL >> 27) & 31];

}

static inline size_t mi_clz(uintptr_t x) {
Expand Down
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Fixed an out-of-bounds read in the generic implementation of ``mi_clz32`` and ``mi_ctz32`` in the integrated mimalloc allocator. This bug could occur on platforms with 64-bit ``unsigned long`` values. Based on upstream fix from microsoft/mimalloc.
Loading
[8]ページ先頭
©2009-2025 Movatter.jp