Adrian Hunter d666e3c9af perf: Prevent passing zero nr_pages to rb_alloc_aux() ... [ Upstream commit dbc48c8f41 ] nr_pages is unsigned long but gets passed to rb_alloc_aux() as an int, and is stored as an int. Only power-of-2 values are accepted, so if nr_pages is a 64_bit value, it will be passed to rb_alloc_aux() as zero. That is not ideal because: 1. the value is incorrect 2. rb_alloc_aux() is at risk of misbehaving, although it manages to return -ENOMEM in that case, it is a result of passing zero to get_order() even though the get_order() result is documented to be undefined in that case. Fix by simply validating the maximum supported value in the first place. Use -ENOMEM error code for consistency with the current error code that is returned in that case. Fixes: 45bfb2e504 ("perf: Add AUX area to ring buffer for raw data streams") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20240624201101.60186-6-adrian.hunter@intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-08-03 08:49:07 +02:00
..
callchain.c	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
core.c	perf: Prevent passing zero nr_pages to rb_alloc_aux()	2024-08-03 08:49:07 +02:00
hw_breakpoint_test.c	perf/hw_breakpoint: test: Skip the test if dependencies unmet	2022-11-02 12:22:05 +01:00
hw_breakpoint.c	perf/hw_breakpoint: Annotate tsk->perf_event_mutex vs ctx->mutex	2022-10-04 13:32:09 +02:00
internal.h	perf: Fix perf_aux_size() for greater-than 32-bit size	2024-08-03 08:49:07 +02:00
Makefile	perf/hw_breakpoint: Add KUnit test for constraints accounting	2022-08-30 10:56:20 +02:00
ring_buffer.c	perf/core: Bail out early if the request AUX area is out of bound	2023-11-28 17:06:54 +00:00
uprobes.c	mm/madvise: add file and shmem support to MADV_COLLAPSE	2022-10-03 14:03:33 -07:00