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prefer ln to cp for temporary copy of sshd

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I saw failures on the reexec fallback test on Darwin 19.4 where
fork()ed children of a process that had it's executable removed
would instantly fail. Using ln to preserve the inode avoids this.
This commit is contained in:
Damien Miller 2020-05-14 12:22:09 +10:00
parent f700d316c6
commit 3ab6fccc39
1 changed files with 4 additions and 1 deletions
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5
regress/reexec.sh
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@ -9,7 +9,10 @@ SSHD_COPY=$OBJ/sshd
# Start a sshd and then delete it # Start a sshd and then delete it
start_sshd_copy () start_sshd_copy ()
{ {
cp $SSHD_ORIG $SSHD_COPY # NB. prefer ln to cp here. On some OSX 19.4 configurations,
# djm has seen failure after fork() when the executable image
# has been removed from the filesystem.
ln $SSHD_ORIG $SSHD_COPY || cp $SSHD_ORIG $SSHD_COPY
SSHD=$SSHD_COPY SSHD=$SSHD_COPY
start_sshd start_sshd
SSHD=$SSHD_ORIG SSHD=$SSHD_ORIG