exec: Copy oldsighand->action under spin-lock
stable inclusion from stable-v5.10.153 commit 9ba2990f4e8027256e2f24d361e44e987246949f category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I64YCA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=9ba2990f4e8027256e2f24d361e44e987246949f -------------------------------- commit 5bf2fedc upstream. unshare_sighand should only access oldsighand->action while holding oldsighand->siglock, to make sure that newsighand->action is in a consistent state. Signed-off-by: NBernd Edlinger <bernd.edlinger@hotmail.de> Cc: stable@vger.kernel.org Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by: NKees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/AM8PR10MB470871DEBD1DED081F9CC391E4389@AM8PR10MB4708.EURPRD10.PROD.OUTLOOK.COMSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NLipeng Sang <sanglipeng1@jd.com>
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