Yes, this would kill the database!
You should do the procedure in the sapdata directories:
oracrp> cd /oracle/CRP/sapdata1
oracrp> chmod -rf chmod -R 755 *
oracrp> cd /oracle/CRP/sapdata2
oracrp> chmod -rf chmod -R 755 *
oracrp> cd /oracle/CRP/sapdata3
oracrp> chmod -rf chmod -R 755 *
oracrp> cd /oracle/CRP/sapdata4
oracrp> chmod -rf chmod -R 755 *
Best regards
Willi Eimler