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| author | Beau Belgrave <[email protected]> | 2023-04-25 22:51:07 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2023-04-26 01:04:45 +0000 |
| commit | 41d8fba193b36ac1208d8f8489390b93675fab7b (patch) | |
| tree | 9ccc495aa71ee5ccf650ab62275e777b6843029e /tools/perf/util/trace-event-scripting.c | |
| parent | tracing/user_events: Prevent same address and bit per process (diff) | |
| download | kernel-41d8fba193b36ac1208d8f8489390b93675fab7b.tar.gz kernel-41d8fba193b36ac1208d8f8489390b93675fab7b.zip | |
tracing/user_events: Limit max fault-in attempts
When event enablement changes, user_events attempts to update a bit in
the user process. If a fault is hit, an attempt to fault-in the page and
the write is retried if the page made it in. While this normally requires
a couple attempts, it is possible a bad user process could attempt to
cause infinite loops.
Ensure fault-in attempts either sync or async are limited to a max of 10
attempts for each update. When the max is hit, return -EFAULT so another
attempt is not made in all cases.
Link: https://lkml.kernel.org/r/[email protected]
Suggested-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Beau Belgrave <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions