Defer setting up enhanced recording until after PAM has completed initializing #29279
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friendly ping @lxea @probakowski |
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The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
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@rosstimothy See the table below for backport results.
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rosstimothy
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…9279) The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
rosstimothy
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…9279) The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
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…9279) (#29580) The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
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…9279) (#29582) The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
rosstimothy
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
rosstimothy
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
github-merge-queue bot
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
github-merge-queue bot
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
github-merge-queue bot
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
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The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording.
The old process was:
The new process is now:
Closes #29030