| 1 | Date: Sat, 22 Apr 2000 06:07:06 -0600 (MDT)
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| 2 | From: "Nelson H. F. Beebe" <beebe@math.utah.edu>
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| 3 | To: arnold@gnu.org
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| 4 | Cc: beebe@math.utah.edu, sysstaff@math.utah.edu, othmer@math.utah.edu
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| 5 | Subject: gawk-3.0.4 and a GNU/Linux gotcha
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| 6 |
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| 7 | Yesterday, I was assisting a colleague install some software on his
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| 8 | GNU/Linux machine for which uname -r reports 2.2.14.
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| 9 |
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| 10 | A (mis)feature of this system, which I've never encountered before,
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| 11 | broke the build of one of my programs, and also of gawk-3.0.4.
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| 12 |
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| 13 | Namely, the kernel will not execute anything that resides in /tmp,
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| 14 | though it will if the same script is in /usr/tmp!
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| 15 |
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| 16 | % cat /tmp/foo.sh
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| 17 | #! /bin/sh
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| 18 | echo hello
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| 19 |
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| 20 | ls -l /tmp/foo.sh
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| 21 | -rwxr-xr-x 1 othmer math 22 Apr 21 10:34 /tmp/foo.sh*
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| 22 |
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| 23 | % /tmp/foo.sh
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| 24 | bash: /tmp/foo.sh: Permission denied
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| 25 |
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| 26 | % cp /tmp/foo.sh /usr/tmp
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| 27 |
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| 28 | % /usr/tmp/foo.sh
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| 29 | hello
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| 30 |
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| 31 | Thus, programs that do a temporary install in /tmp, as some of mine do
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| 32 | in order to run the validation suite, will fail.
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| 33 |
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| 34 | gawk-3.0.4, and likely other gawk versions, hits this problem too. It
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| 35 | fails because test/poundbang starts with
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| 36 |
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| 37 | #! /tmp/gawk -f
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| 38 |
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| 39 | I tracked down where it comes from:
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| 40 |
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| 41 | % grep /tmp /etc/fstab
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| 42 | /dev/hda3 /tmp ext2 rw,nosuid,noexec,nouser,auto,async,nodev 1 1
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| 43 | !!!!!!
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| 44 |
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| 45 | Since this is done via a mount command, potentially ANY directory tree
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| 46 | could be mounted with noexec.
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