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authorOleg Nesterov <oleg@redhat.com>2024-09-11 15:13:20 +0200
committerAndrew Morton <akpm@linux-foundation.org>2024-09-17 10:07:01 +0200
commited8d5b0ce1d738e13c60d6b1a901a56d832e5070 (patch)
tree1e94644a1af1b9af23b159bdd273c8101bee2482 /kernel/fork.c
parentmm: support large folios swap-in for sync io devices (diff)
downloadlinux-ed8d5b0ce1d738e13c60d6b1a901a56d832e5070.tar.xz
linux-ed8d5b0ce1d738e13c60d6b1a901a56d832e5070.zip
Revert "uprobes: use vm_special_mapping close() functionality"
This reverts commit 08e28de1160a712724268fd33d77b32f1bc84d1c. A malicious application can munmap() its "[uprobes]" vma and in this case xol_mapping.close == uprobe_clear_state() will free the memory which can be used by another thread, or the same thread when it hits the uprobe bp afterwards. Link: https://lkml.kernel.org/r/20240911131320.GA3448@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.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> Cc: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--kernel/fork.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 61070248a7d3..3d590e51ce84 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1338,6 +1338,7 @@ static inline void __mmput(struct mm_struct *mm)
{
VM_BUG_ON(atomic_read(&mm->mm_users));
+ uprobe_clear_state(mm);
exit_aio(mm);
ksm_exit(mm);
khugepaged_exit(mm); /* must run before exit_mmap */