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6d27a31ef1
Currently each xol_area has its own instance of vm_special_mapping, this is suboptimal and ugly. Kill xol_area->xol_mapping and add a single global instance of vm_special_mapping, the ->fault() method can use area->pages rather than xol_mapping->pages. As a side effect this fixes the problem introduced by the recent commit223febc6e5("mm: add optional close() to struct vm_special_mapping"), if special_mapping_close() is called from the __mmput() paths, it will use vma->vm_private_data = &area->xol_mapping freed by uprobe_clear_state(). Link: https://lkml.kernel.org/r/20240911131407.GB3448@redhat.com Fixes:223febc6e5("mm: add optional close() to struct vm_special_mapping") Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Sven Schnelle <svens@linux.ibm.com> Closes: https://lore.kernel.org/all/yt9dy149vprr.fsf@linux.ibm.com/ Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>