Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: binder: fix async_free_space accounting for empty parcels In 4.13, commit 74310e06be4d ("android: binder: Move buffer out of area shared with user space") fixed a kernel structure visibility issue. As part of that patch, sizeof(void *) was used as the buffer size for 0-length data payloads so the driver could detect abusive clients sending 0-length asynchronous transactions to a server by enforcing limits on async_free_size. Unfortunately, on the "free" side, the accounting of async_free_space did not add the sizeof(void *) back. The result was that up to 8-bytes of async_free_space were leaked on every async transaction of 8-bytes or less. These small transactions are uncommon, so this accounting issue has gone undetected for several years. The fix is to use "buffer_size" (the allocated buffer size) instead of "size" (the logical buffer size) when updating the async_free_space during the free operation. These are the same except for this corner case of asynchronous transactions with payloads < 8 bytes.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 74310e06be4d74dcf67cd108366710dee5c576d5 before 2d2df539d05205fd83c404d5f2dff48d36f9b495; affected 74310e06be4d74dcf67cd108366710dee5c576d5 before 7c7064402609aeb6fb11be1b4ec10673ff17b593; affected 74310e06be4d74dcf67cd108366710dee5c576d5 before 103b16a8c51f96d5fe063022869ea906c256e5da; affected 74310e06be4d74dcf67cd108366710dee5c576d5 before 1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4; affected 74310e06be4d74dcf67cd108366710dee5c576d5 before 17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff; affected 74310e06be4d74dcf67cd108366710dee5c576d5 before cfd0d84ba28c18b531648c9d4a35ecca89ad9901 |
| Linux / Linux | affected 4.14; unaffected 0 before 4.14; unaffected 4.14.261 through 4.14.*; unaffected 4.19.224 through 4.19.*; unaffected 5.4.170 through 5.4.*; unaffected 5.10.90 through 5.10.*; unaffected 5.15.13 through 5.15.*; unaffected 5.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2d2df539d05205fd83c404d5f2dff48d36f9b495
- https://git.kernel.org/stable/c/7c7064402609aeb6fb11be1b4ec10673ff17b593
- https://git.kernel.org/stable/c/103b16a8c51f96d5fe063022869ea906c256e5da
- https://git.kernel.org/stable/c/1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4
- https://git.kernel.org/stable/c/17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff
- https://git.kernel.org/stable/c/cfd0d84ba28c18b531648c9d4a35ecca89ad9901
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/2d2df539d05205fd83c404d5f2dff48d36f9b495
- https://git.kernel.org/stable/c/7c7064402609aeb6fb11be1b4ec10673ff17b593
- https://git.kernel.org/stable/c/103b16a8c51f96d5fe063022869ea906c256e5da
- https://git.kernel.org/stable/c/1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4
- https://git.kernel.org/stable/c/17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff
- https://git.kernel.org/stable/c/cfd0d84ba28c18b531648c9d4a35ecca89ad9901