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Revert "Revert "CHROMIUM: cgroups: relax permissions on moving tasks between cgroups""

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This reverts commit 631c0bba0a.

Although this boots and passes CI build/boot testing, it leaves a
dirty trail consisting of 1000's of failures in the log and probably
wouldn't function all that well on a real H/W platform.

  08-16 12:20:13.003   658   697 E libprocessgroup: AddTidToCgroup failed to write '3138'; fd=121: Permission denied
  08-16 12:20:13.003   658   697 E libprocessgroup: Failed to add task into cgroup

Change-Id: Ia0f1948b0e94c27e5cecae8691348e044b32f7d6
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones
2021-08-16 14:50:13 +01:00
parent 631c0bba0a
commit eba773ab53
1 changed files with 2 additions and 1 deletions
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3
kernel/cgroup/cgroup-v1.c
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@@ -511,7 +511,8 @@ static ssize_t __cgroup1_procs_write(struct kernfs_open_file *of,
tcred = get_task_cred(task);
if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
!uid_eq(cred->euid, tcred->uid) &&
!uid_eq(cred->euid, tcred->suid))
!uid_eq(cred->euid, tcred->suid) &&
!ns_capable(tcred->user_ns, CAP_SYS_NICE))
ret = -EACCES;
put_cred(tcred);
if (ret)