diff options
| author | Vasily Gorbik <[email protected]> | 2018-09-14 17:29:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <[email protected]> | 2018-09-20 13:20:29 +0200 |
| commit | d1befa65823e9c6d013883b8a41d081ec338c489 (patch) | |
| tree | e41d581c2cd188884a016bd9f689eb57ae60f1f5 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 1c472d46283263497adccd7a0bec64ee2f9c09e5 (diff) | |
s390/vdso: avoid 64-bit vdso mapping for compat tasks
vdso_fault used is_compat_task function (on s390 it tests "current"
thread_info flags) to distinguish compat tasks and map 31-bit vdso
pages. But "current" task might not correspond to mm context.
When 31-bit compat inferior is executed under gdb, gdb does
PTRACE_PEEKTEXT on vdso page, causing vdso_fault with "current" being
64-bit gdb process. So, 31-bit inferior ends up with 64-bit vdso mapped.
To avoid this problem a new compat_mm flag has been introduced into
mm context. This flag is used in vdso_fault and vdso_mremap instead
of is_compat_task.
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions