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MDEV-22159: Don't redirect as root to a tmp file not owned by root

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Also add a check for tmp file being empty and bail out with a clear
error message in such a case, as mysqld_safe prevents normal stderr
from being displayed anywhere and would fail silently on this.
This commit is contained in:
Otto Kekäläinen 2020-04-21 21:14:54 +03:00 • committed by Jan Lindström
parent a6a8774d47
commit efa3b3de35
1 changed files with 8 additions and 1 deletions
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9
scripts/mysqld_safe.sh
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@ -263,7 +263,9 @@ wsrep_recover_position() {
fi
if [ -f $wr_logfile ]; then
[ "$euid" = "0" ] && chown $user $wr_logfile
# NOTE! Do not change ownership of the temporary file, as on newer kernel
# versions fs.protected_regular is set to '2' and redirecting output with >
# as root to a file not owned by root will fail with "Permission denied"
chmod 600 $wr_logfile
else
log_error "WSREP: mktemp failed"
@ -278,6 +280,11 @@ wsrep_recover_position() {
eval "$mysqld_cmd --wsrep_recover $wr_options 2> $wr_logfile"
if [ ! -s "$wr_logfile" ]; then
log_error "Log file $wr_logfile was empty, cannot proceed. Is system running fs.protected_regular?"
exit 1
fi
local rp="$(grep 'WSREP: Recovered position:' $wr_logfile)"
if [ -z "$rp" ]; then
local skipped="$(grep WSREP $wr_logfile | grep 'skipping position recovery')"