47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
Date: Sat, 22 Apr 2000 06:07:06 -0600 (MDT)
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From: "Nelson H. F. Beebe" <beebe@math.utah.edu>
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To: arnold@gnu.org
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Cc: beebe@math.utah.edu, sysstaff@math.utah.edu, othmer@math.utah.edu
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Subject: gawk-3.0.4 and a GNU/Linux gotcha
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Yesterday, I was assisting a colleague install some software on his
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GNU/Linux machine for which uname -r reports 2.2.14.
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A (mis)feature of this system, which I've never encountered before,
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broke the build of one of my programs, and also of gawk-3.0.4.
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Namely, the kernel will not execute anything that resides in /tmp,
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though it will if the same script is in /usr/tmp!
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% cat /tmp/foo.sh
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#! /bin/sh
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echo hello
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ls -l /tmp/foo.sh
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-rwxr-xr-x 1 othmer math 22 Apr 21 10:34 /tmp/foo.sh*
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% /tmp/foo.sh
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bash: /tmp/foo.sh: Permission denied
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% cp /tmp/foo.sh /usr/tmp
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% /usr/tmp/foo.sh
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hello
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Thus, programs that do a temporary install in /tmp, as some of mine do
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in order to run the validation suite, will fail.
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gawk-3.0.4, and likely other gawk versions, hits this problem too. It
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fails because test/poundbang starts with
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#! /tmp/gawk -f
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I tracked down where it comes from:
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% grep /tmp /etc/fstab
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/dev/hda3 /tmp ext2 rw,nosuid,noexec,nouser,auto,async,nodev 1 1
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!!!!!!
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Since this is done via a mount command, potentially ANY directory tree
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could be mounted with noexec.
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