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55bc4168bf
Fix for CVE-2014-2906. Closes a race condition in funced which would allow execution of arbitrary code; closes a race condition in psub which would allow alternation of the data stream. Note that `psub -f` does not work (#1040); a fix should be committed separately for ease of maintenance. Closes #1437
76 lines
1.5 KiB
Fish
76 lines
1.5 KiB
Fish
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function psub --description "Read from stdin into a file and output the filename. Remove the file when the command that called psub exits."
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set -l filename
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set -l funcname
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set -l use_fifo 1
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set -l shortopt -o hf
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set -l longopt -l help,file
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if getopt -T >/dev/null
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set longopt
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end
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if not getopt -n psub -Q $shortopt $longopt -- $argv >/dev/null
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return 1
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end
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set -l tmp (getopt $shortopt $longopt -- $argv)
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eval set opt $tmp
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while count $opt >/dev/null
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switch $opt[1]
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case -h --help
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__fish_print_help psub
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return 0
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case -f --file
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set use_fifo 0
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case --
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set -e opt[1]
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break
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end
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set -e opt[1]
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end
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if not status --is-command-substitution
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echo psub: Not inside of command substitution >&2
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return
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end
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if test use_fifo = 1
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# Write output to pipe. This needs to be done in the background so
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# that the command substitution exits without needing to wait for
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# all the commands to exit
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set dir (mktemp -d /tmp/.psub.XXXXXXXXXX); or return
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set filename $dir/psub.fifo
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mkfifo $filename
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cat >$filename &
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else
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set filename (mktemp /tmp/.psub.XXXXXXXXXX)
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cat >$filename
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end
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# Write filename to stdout
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echo $filename
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# Find unique function name
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while true
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set funcname __fish_psub_(random);
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if not functions $funcname >/dev/null ^/dev/null
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break;
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end
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end
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# Make sure we erase file when caller exits
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eval function $funcname --on-job-exit caller\; command rm $filename\; functions -e $funcname\; end
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end
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