5d3aa86cd1
Introduce an android_mallopt(M_DISABLE_MEMORY_MITIGATIONS) API call that may be used to disable zero- or pattern-init on non-MTE hardware, or memory tagging on MTE hardware. The intent is that this function may be called at any time, including when there are multiple threads running. Disabling zero- or pattern-init is quite trivial, we just need to set a global variable to 0 via a Scudo API call (although there will be some separate work required on the Scudo side to make this operation thread-safe). It is a bit more tricky to disable MTE across a process, because the kernel does not provide an API for disabling tag checking in all threads in a process, only per-thread. We need to send a signal to each of the process's threads with a handler that issues the required prctl call, and lock thread creation for the duration of the API call to avoid races between thread enumeration and calls to pthread_create(). Bug: 135772972 Change-Id: I81ece86ace916eb6b435ab516cd431ec4b48a3bf |
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| .. | ||
| android_unsafe_frame_pointer_chase.h | ||
| fdtrack.h | ||
| macros.h | ||
| malloc.h | ||
| mte.h | ||
| mte_kernel.h | ||
| page.h | ||
| reserved_signals.h | ||
| tls.h | ||
| tls_defines.h | ||