漏洞信息
# cpufreq:sun50i:防止越界访问
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漏洞标题
cpufreq: sun50i: prevent out-of-bounds access
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved:
cpufreq: sun50i: prevent out-of-bounds access
A KASAN enabled kernel reports an out-of-bounds access when handling the
nvmem cell in the sun50i cpufreq driver:
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BUG: KASAN: slab-out-of-bounds in sun50i_cpufreq_nvmem_probe+0x180/0x3d4
Read of size 4 at addr ffff000006bf31e0 by task kworker/u16:1/38
This is because the DT specifies the nvmem cell as covering only two
bytes, but we use a u32 pointer to read the value. DTs for other SoCs
indeed specify 4 bytes, so we cannot just shorten the variable to a u16.
Fortunately nvmem_cell_read() allows to return the length of the nvmem
cell, in bytes, so we can use that information to only access the valid
portion of the data.
To cover multiple cell sizes, use memcpy() to copy the information into a
zeroed u32 buffer, then also make sure we always read the data in little
endian fashion, as this is how the data is stored in the SID efuses.
CVSS信息
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漏洞类别
N/A
漏洞标题
Linux kernel 安全漏洞
漏洞描述信息
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞,该漏洞源于越界访问,可能导致内存损坏。
CVSS信息
N/A
漏洞类别
其他