Regression in latest SLR betas and steamrt3c Steam Client if using pam_tmpdir or pam_mktemp
已经有一个关联 PR 被合并了。
- #807 来自 @smcv —— 已合并
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 40/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
- 活跃度
- 活跃
- 技术栈
- linux, shell
- 领域
- cli, devops, operating-systems
调研方向
The issue is about bubblewrap (bwrap) 0.12.0 failing when PAM modules like pam_tmpdir set TMPDIR to a directory with unusual permissions. Start by examining the steam-runtime's srt-bwrap integration and the linked bubblewrap issue #806. Reproduce the failure with the given shell commands, then look at bwrap's source code around directory creation and permission handling. The fix likely involves modifying bwrap's handling of bind mounts for directories with restricted parent traversal permissions.
由索引模型根据 Issue 内容生成。
描述
After updating the Steam Runtime's internal copy of bubblewrap (srt-bwrap) to 0.12.0, launching its containers no longer works on a system with Debian's pam_tmpdir, or with OpenWall's pam_mktemp as packaged by Gentoo. Despite being unrelated codebases, these two are basically equivalent: they're implementations of the same idea.
These PAM modules create a restricted parent directory that ordinary users can traverse through, but not list (this is unusual!), and then a per-user private temp directory inside that, and set TMPDIR (among other environment variables) to that per-user directory. The same effect can be reproduced on a test system with something like this:
sudo mkdir -m711 /tmp/private
sudo install -d -o$(id -nu) -g$(id -ng) -m1770 /tmp/private/$(id -nu)
# the PAM module would do the equivalent of: export TMPDIR=/tmp/private/$(id -nu)
bwrap --ro-bind / / --bind "/tmp/private/$(id -nu)" "/tmp/private/$(id -nu) -- true
With older bwrap builds, this worked. With a newer bwrap build, it fails with bwrap: Can't mkdir parents for /tmp/private/user: Permission denied. This is tracked as https://github.com/containers/bubblewrap/issues/806 in bwrap.
Affected versions
Steam Linux Runtime betas dated x.0.20260914.y are affected.
The experimental steamrt3c Steam Client is not currently affected, but its next beta probably will be.
Workarounds
- Don't use
pam_tmpdirorpam_mktemp - Or set all of the environment variables
TMP,TMPDIR,TEMPandTEMPDIRto an existing directory whose parent directories are all readable (for example$HOME/tmp,/tmpor/var/tmp) before starting Steam
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