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Viewing changes to dracut-module/cmdline-mandos.sh

  • Committer: Teddy Hogeborn
  • Date: 2016-03-17 20:40:55 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 341.
  • Revision ID: teddy@recompile.se-20160317204055-bhsh5xsidq7w5cxu
Client: Fix plymouth agent; broken since 1.7.2.

Fix an very old memory bug in the plymouth agent (which has been
present since its apperance in version 1.2), but which was only
recently detected at run time due to the new -fsanitize=address
compile- time flag, which has been used since version 1.7.2.  This
detection of a memory access violation causes the program to abort,
making the Plymouth graphical boot system unable to accept interactive
input of passwords when using the Mandos client.

* plugins.d/plymouth.c (exec_and_wait): Fix memory allocation bug when
  allocating new_argv.  Also tolerate a zero-length argv.

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dracut-module/cmdline-mandos.sh
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#!/bin/sh
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#
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# This file should be present in the root file system directory
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# /usr/lib/dracut/modules.d/90mandos.  When dracut creates the
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# initramfs image, dracut will run the "module-setup.sh" file in the
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# same directory, which (when *not* using the "systemd" dracut module)
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# will copy this file ("cmdline-mandos.sh") into the initramfs as
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# "/lib/dracut/hooks/cmdline/20-cmdline-mandos.sh".
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# 
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# Despite the above #!/bin/sh line and the executable flag, this file
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# is not executed; this file is sourced by the /init script in the
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# initramfs image created by dracut.
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if getargbool 1 mandos && [ -e /lib/dracut-crypt-lib.sh ]; then
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    cat >> /lib/dracut-crypt-lib.sh <<- "EOF"
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        ask_for_password(){
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            local cmd; local prompt; local tries=3
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            local ply_cmd; local ply_prompt; local ply_tries=3
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            local tty_cmd; local tty_prompt; local tty_tries=3
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            local ret
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            while [ $# -gt 0 ]; do
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                case "$1" in
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                    --cmd) ply_cmd="$2"; tty_cmd="$2"; shift;;
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                    --ply-cmd) ply_cmd="$2"; shift;;
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                    --tty-cmd) tty_cmd="$2"; shift;;
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                    --prompt) ply_prompt="$2"; tty_prompt="$2"; shift;;
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                    --ply-prompt) ply_prompt="$2"; shift;;
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                    --tty-prompt) tty_prompt="$2"; shift;;
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                    --tries) ply_tries="$2"; tty_tries="$2"; shift;;
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                    --ply-tries) ply_tries="$2"; shift;;
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                    --tty-tries) tty_tries="$2"; shift;;
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                    --tty-echo-off) tty_echo_off=yes;;
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                    -*) :;;
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                esac
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                shift
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            done
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            if [ -z "$ply_cmd" ]; then
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                ply_cmd="$tty_cmd"
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            fi
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            # Extract device and luksname from $ply_cmd
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            set -- $ply_cmd
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            shift
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            for arg in "$@"; do
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                case "$arg" in
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                    -*) :;;
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                    *)
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                        if [ -z "$device" ]; then
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                            device="$arg"
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                        else
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                            luksname="$arg"
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                            break
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                        fi
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                        ;;
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                esac
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            done
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            { flock -s 9;
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              if [ -z "$ply_prompt" ]; then
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                  if [ -z "$tty_prompt" ]; then
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
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                  else
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=password-prompt:--prompt="${tty_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
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                  fi
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              else
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                  if [ -z "$tty_prompt" ]; then
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=plymouth:--prompt="${ply_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
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                  else
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=password-prompt:--prompt="${tty_prompt}" --options-for=plymouth:--prompt="${ply_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
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                  fi
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              fi
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            } 9>/.console_lock
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        }
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        EOF
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fi