Greg Thelen 4716023a8f perf/core: Avoid put_page() when GUP fails ... PEBS PERF_SAMPLE_PHYS_ADDR events use perf_virt_to_phys() to convert PMU sampled virtual addresses to physical using get_user_page_fast_only() and page_to_phys(). Some get_user_page_fast_only() error cases return false, indicating no page reference, but still initialize the output page pointer with an unreferenced page. In these error cases perf_virt_to_phys() calls put_page(). This causes page reference count underflow, which can lead to unintentional page sharing. Fix perf_virt_to_phys() to only put_page() if get_user_page_fast_only() returns a referenced page. Fixes: fc7ce9c74c ("perf/core, x86: Add PERF_SAMPLE_PHYS_ADDR") Signed-off-by: Greg Thelen <gthelen@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20211111021814.757086-1-gthelen@google.com		2021-11-11 13:09:34 +01:00
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callchain.c	uaccess: add force_uaccess_{begin,end} helpers	2020-08-12 10:57:59 -07:00
core.c	perf/core: Avoid put_page() when GUP fails	2021-11-11 13:09:34 +01:00
hw_breakpoint.c	perf/hw_breakpoint: Replace deprecated CPU-hotplug functions	2021-08-26 09:14:36 +02:00
internal.h	tracing/perf: Add interrupt_context_level() helper	2021-10-19 20:33:20 -04:00
Makefile	perf/core: allow ftrace for functions in kernel/event/core.c	2021-10-25 22:50:42 -04:00
ring_buffer.c	perf: Cap allocation order at aux_watermark	2021-04-16 16:32:39 +02:00
uprobes.c	mm/memcg: Convert mem_cgroup_charge() to take a folio	2021-09-27 09:27:31 -04:00