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um: defer killing userspace on page table update failures
commit a7d4888 upstream. In some cases we can get to fix_range_common() with mmap_sem held, and in others we get there without it being held. For example, we get there with it held from sys_mprotect(), and without it held from fork_handler(). Avoid any issues in this and simply defer killing the task until it runs the next time. Do it on the mm so that another task that shares the same mm can't continue running afterwards. Cc: stable@vger.kernel.org Fixes: 468f659 ("um: Fix hung task in fix_range_common()") Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Original file line number | Diff line number | Diff line change |
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@@ -12,6 +12,7 @@ struct mm_id { | |
int pid; | ||
} u; | ||
unsigned long stack; | ||
int kill; | ||
}; | ||
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#endif |
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