diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2020-35508/0001-fork-fix-copy_process-CLONE_PARENT-race-with-the-exi.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2020-35508/0001-fork-fix-copy_process-CLONE_PARENT-race-with-the-exi.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2020-35508/0001-fork-fix-copy_process-CLONE_PARENT-race-with-the-exi.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2020-35508/0001-fork-fix-copy_process-CLONE_PARENT-race-with-the-exi.patch new file mode 100644 index 000000000..61004dbdc --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2020-35508/0001-fork-fix-copy_process-CLONE_PARENT-race-with-the-exi.patch @@ -0,0 +1,55 @@ +From 7589cef5e0bd71dc3830aeccbda9c0b718641a63 Mon Sep 17 00:00:00 2001 +From: Eddy Wu <itseddy0402@gmail.com> +Date: Sat, 7 Nov 2020 14:47:22 +0800 +Subject: [PATCH] fork: fix copy_process(CLONE_PARENT) race with the exiting + ->real_parent + +current->group_leader->exit_signal may change during copy_process() if +current->real_parent exits. + +Move the assignment inside tasklist_lock to avoid the race. + +Signed-off-by: Eddy Wu <eddy_wu@trendmicro.com> +Acked-by: Oleg Nesterov <oleg@redhat.com> +Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> +--- + kernel/fork.c | 10 +++++----- + 1 file changed, 5 insertions(+), 5 deletions(-) + +diff --git a/kernel/fork.c b/kernel/fork.c +index 9180f4416dba..fe799c9e787b 100644 +--- a/kernel/fork.c ++++ b/kernel/fork.c +@@ -2080,14 +2080,9 @@ static __latent_entropy struct task_struct *copy_process( + /* ok, now we should be set up.. */ + p->pid = pid_nr(pid); + if (clone_flags & CLONE_THREAD) { +- p->exit_signal = -1; + p->group_leader = current->group_leader; + p->tgid = current->tgid; + } else { +- if (clone_flags & CLONE_PARENT) +- p->exit_signal = current->group_leader->exit_signal; +- else +- p->exit_signal = args->exit_signal; + p->group_leader = p; + p->tgid = p->pid; + } +@@ -2132,9 +2127,14 @@ static __latent_entropy struct task_struct *copy_process( + if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) { + p->real_parent = current->real_parent; + p->parent_exec_id = current->parent_exec_id; ++ if (clone_flags & CLONE_THREAD) ++ p->exit_signal = -1; ++ else ++ p->exit_signal = current->group_leader->exit_signal; + } else { + p->real_parent = current; + p->parent_exec_id = current->self_exec_id; ++ p->exit_signal = args->exit_signal; + } + + klp_copy_process(p); +-- +2.17.1 + |