Enable heap memory zeroing on allocation by default
configname: CONFIG_INIT_ON_ALLOC_DEFAULT_ON
Linux Kernel Configuration
└─>Security options
└─>Kernel hardening options
└─>Memory initialization
└─>Enable heap memory zeroing on allocation by default
In linux kernel since version 5.1 (release Date: 2019-05-05)
This has the effect of setting "init_on_alloc=1" on the kernel
command line. This can be disabled with "init_on_alloc=0".
When "init_on_alloc" is enabled, all page allocator and slab
allocator memory will be zeroed when allocated, eliminating
many kinds of "uninitialized heap memory" flaws, especially
heap content exposures. The performance impact varies by
workload, but most cases see <1% impact. Some synthetic
workloads have measured as high as 7%.
command line. This can be disabled with "init_on_alloc=0".
When "init_on_alloc" is enabled, all page allocator and slab
allocator memory will be zeroed when allocated, eliminating
many kinds of "uninitialized heap memory" flaws, especially
heap content exposures. The performance impact varies by
workload, but most cases see <1% impact. Some synthetic
workloads have measured as high as 7%.