Www Thegeekstuff Com 2013 02 Stack Smashing Attacks Gcc Utm

7/29/2019 Www Thegeekstuff Com 2013 02 Stack Smashing Attacks Gcc Utm

1/7

pdfcrowd comopen in browser PRO version Are you a developer? Try out the HTML to PDF API

7 Like 5

How to Avoid Stack Smashing Attacks with GCCbyHIMANSHU ARORA on FEBRUARY 7, 2013

Tweet 1

Stack smashing is a fancy term used for stack buffer overflows. It refers to attacks that exploit

bugs in code enabling buffer overflows. Earlier it was solely the responsibility of

programmers/developers to make sure that there is no possibility of a buffer overflow in their

code but with time compilers like gcc have got flags to make sure that buffer overflow problems

are not exploited by crackers to damage a system or a program.

I came to know about these flags when I was trying to reproduce a buffer overflow on my

Ubuntu 12.04 with gcc 4.6.3 version. Here is what I was trying to do :

#include

#include

int main(void)

{

int len = 0;

char str[10] = {0};

Sign up for our free email newsletter

[email protected] Sign Up

RSS Twitter Facebook

Search

Install Google Chrome

www.google.com/chrome

A free browser that lets you do more of what you like online!

Ads by Google Geek Unix Basic Unix Commands Print in Unix

Home A bout Free eBook A rch ives Bes t o f t he B lo g Contac t
http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504https://www.google.com/adsense/support/bin/request.py?contact=abg_afc&url=http://www.thegeekstuff.com/2013/02/stack-smashing-attacks-gcc/%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&hl=en&client=ca-pub-8090601437064582&rad0=Geek&rad1=Unix&rad2=Basic+Unix+Commands&rad3=Print+in+Unixhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGengo0KOfIAFlfEgRHZWVrGgjpqF0kswSZVigBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Geekhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGergo0KOfIAFlfEgRVbml4Ggj8Q6YwORPHDSgBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Unixhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGesQo0KOfIAFlfEhNCYXNpYyBVbml4IENvbW1hbmRzGghXv9LY7aTQECgBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Basic+Unix+Commandshttp://www.thegeekstuff.com/http://www.thegeekstuff.com/http://www.thegeekstuff.com/http://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/https://twitter.com/intent/tweet?original_referer=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&text=How%20to%20Avoid%20Stack%20Smashing%20Attacks%20with%20GCC&tw_p=tweetbutton&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2Fhttp://twitter.com/search?q=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2Fhttp://www.thegeekstuff.com/feedhttp://www.thegeekstuff.com/feedhttp://twitter.com/thegeekstuffhttp://www.facebook.com/thegeekstuffhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=C_bFhCJUUUY6QL4re0AGwn4HQDPvu9f4Ew5XLx0u7vs3ooQEQASCigdcLULuBkc39_____wFgyY78irSk2A-gAZXon9QDyAEBqAMByAPfBKoExAFP0Kha0HZp_UuDS9y8yZTqkuNAmLgZfVKSgVVzDmBuGr1_4Rx9Y_dTezcVtaHh5yupObTf_P2n3bGxMrmpaM9a_qyRXaxz-6NyqLtyqsMpfuvq4LNuw5zmrPne5NhAexPaNeUla3gTvnC1g_G2cOkU6IYWhlZGVT8tcoUy2Gd59VGvSo6WCHB8bH5coIkMkdAHHADyQTnmrxIAZV-ZwjYfInIP5KnYlZbBNIcFLhRK_5xvwP-N33gNmYAGctWMcDLoF83QgAfTl-Ar&num=1&sig=AOD64_2g1E-uhx9kYYdg3cSNvv40_Cwhug&client=ca-pub-8090601437064582&adurl=http://ad.doubleclick.net/clk%3B254126004%3B77916514%3Bdhttp://www.google.com/url?ct=abg&q=https://www.google.com/adsense/support/bin/request.py%3Fcontact%3Dabg_afc%26url%3Dhttp://www.thegeekstuff.com/2013/02/stack-smashing-attacks-gcc/%253Futm_source%253Dfeedburner%2526utm_medium%253Demail%2526utm_campaign%253DFee%26gl%3DUS%26hl%3Den%26client%3Dca-pub-8090601437064582%26ai0%3DC_bFhCJUUUY6QL4re0AGwn4HQDPvu9f4Ew5XLx0u7vs3ooQEQASCigdcLULuBkc39_____wFgyY78irSk2A-gAZXon9QDyAEBqAMByAPfBKoExAFP0Kha0HZp_UuDS9y8yZTqkuNAmLgZfVKSgVVzDmBuGr1_4Rx9Y_dTezcVtaHh5yupObTf_P2n3bGxMrmpaM9a_qyRXaxz-6NyqLtyqsMpfuvq4LNuw5zmrPne5NhAexPaNeUla3gTvnC1g_G2cOkU6IYWhlZGVT8tcoUy2Gd59VGvSo6WCHB8bH5coIkMkdAHHADyQTnmrxIAZV-ZwjYfInIP5KnYlZbBNIcFLhRK_5xvwP-N33gNmYAGctWMcDLoF83QgAfTl-Ar&usg=AFQjCNG67o2Bv0DNuNuKpg4YNqRGO2Ja1ghttps://www.google.com/adsense/support/bin/request.py?contact=abg_afc&url=http://www.thegeekstuff.com/2013/02/stack-smashing-attacks-gcc/%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&hl=en&client=ca-pub-8090601437064582&rad0=Geek&rad1=Unix&rad2=Basic+Unix+Commands&rad3=Print+in+Unixhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGengo0KOfIAFlfEgRHZWVrGgjpqF0kswSZVigBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Geekhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGergo0KOfIAFlfEgRVbml4Ggj8Q6YwORPHDSgBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Unixhttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGesQo0KOfIAFlfEhNCYXNpYyBVbml4IENvbW1hbmRzGghXv9LY7aTQECgBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Basic+Unix+Commandshttp://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8090601437064582&output=html&h=15&slotname=0094642447&w=728&lmt=0&flash=0&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&dt=1360303368333&bpp=2&shv=r20130204&jsv=r20121214&prev_slotnames=4708993701&correlator=1360303368549&frm=20&adk=1617453998&ga_vid=1418570282.1360303369&ga_sid=1360303369&ga_hid=2079434372&ga_fc=0&u_tz=-300&u_his=1&u_java=0&u_h=1024&u_w=1280&u_ah=0&u_aw=0&u_cd=24&u_nplug=0&u_nmime=0&dff=helvetica%20neue&dfs=10&adx=6&ady=181&biw=813&bih=568&oid=3&fu=0&ifi=2&dtd=443&xpc=Xo2nKkxah5&p=http%3A//www.thegeekstuff.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&oe=utf8&height=15&width=728&format=fp_al_lp&fs=medium&f=verdana&kw_type=radlink&prev_fmts=728x15_0ads_al&rt=ChBRFJUJAAGeswo0KOfIAFlfEg1QcmludCBpbiBVbml4GgimIISXr3ubpigBUhMIlare-ISmtQIV5Sw0Ch2AdADz&hl=en&kw0=Geek&kw1=Unix&kw2=Basic+Unix+Commands&kw3=Print+in+Unix&okw=Print+in+Unixhttp://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://www.thegeekstuff.com/http://www.thegeekstuff.com/about/http://www.thegeekstuff.com/linux-101-hacks-ebook/http://www.thegeekstuff.com/archives-2/http://www.thegeekstuff.com/best-of-the-blog/http://www.thegeekstuff.com/contact/


2/7


printf("\n Enter the name \n");

gets(str); // Used gets() to cause buffer overflow

printf("\n len = [%d] \n", len);

len = strlen(str);

printf("\n len of string entered is : [%d]\n", len);

return 0;

}

In the code above, I have used gets() to accept a string from user. and then calculated the

length of this string and printed back on stdout. The idea here is to input a string whose length

is more than 10 bytes. Since gets() does not check array bounds so it will try to copy the input

in the str buffer and this way buffer overflow will take place.

This is what happened when I executed the program:

$ ./stacksmash

Enter the name

TheGeekStuff

len = [0]

len of string entered is : [12]

*** stack smashing detected ***: ./stacksmash terminated

======= Backtrace: =========

/lib/i386-linux-gnu/libc.so.6(__fortify_fail+0x45)[0xb76e4045]

/lib/i386-linux-gnu/libc.so.6(+0x103ffa)[0xb76e3ffa]

./stacksmash[0x8048548]

/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xb75f94d3]

./stacksmash[0x8048401]

======= Memory map: ========

EBOOKS
http://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3Dhttp://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/linux-101-hacks-ebook/http://www.thegeekstuff.com/bash-101-hacks-ebook/http://www.thegeekstuff.com/sed-awk-101-hacks-ebook/http://www.thegeekstuff.com/vim-101-hacks-ebook/http://googleads.g.doubleclick.net/aclk?sa=l&ai=CSpmfCZUUUe3sBePT0AHnyoB4yIOq5QLghaHzPL_hHhABIKKB1wtQ3cO2lwJgyY78irSk2A-gAfSagvkDyAECqAMByAPdBKoEzgFP0Mvy9OBKeBHRQOzIydt55O_I5kXN9ZE2Pj16N1hJkT-G7Q91sDaw0B975p4PnCk4pvqIu0KWev3qxCbXQWz2wf85vwX1gEJ3Kj8NRcPRG4bqH2Nw_O56rkinnFtrXhrAOKjdqDq-aiVmCo1Canujx9E9USIQxTCdEFETbMtTUy0urdoJkCGXecV1ltviwAMI7Mr-gzjjr8RDviUohxnaUNKN6YAOew1oYHVVSYSdaRDnTeRd7tDahWTKBcvTc9AgOtxof5oD6B8lrdogX6AGAoAH9OT9Bg&num=1&sig=AOD64_3Kpqfig1G2pEyFpoGXuaOtne-flA&client=ca-pub-8090601437064582&adurl=http://www.comparecards.com/category/low-interest%3Fk%3D555-3%26aw_cam%3DDisplay_Campaign_Optimizer%26aw_adg%3DDCO%26aw_med%3Dcontent%26aw_pla%3Dwww.thegeekstuff.com%26aw_cre%3D16268288688%26aw_tar%3Dundetermined%26aw_key%3D


3/7


08048000-08049000 r-xp 00000000 08:06 528260 /home/himanshu/practice/stacksmash

08049000-0804a000 r--p 00000000 08:06 528260 /home/himanshu/practice/stacksmash

0804a000-0804b000 rw-p 00001000 08:06 528260 /home/himanshu/practice/stacksmash

0973a000-0975b000 rw-p 00000000 00:00 0 [heap]

b75af000-b75cb000 r-xp 00000000 08:06 787381 /lib/i386-linux-gnu/libgcc_s.so.1

b75cb000-b75cc000 r--p 0001b000 08:06 787381 /lib/i386-linux-gnu/libgcc_s.so.1

b75cc000-b75cd000 rw-p 0001c000 08:06 787381 /lib/i386-linux-gnu/libgcc_s.so.1

b75df000-b75e0000 rw-p 00000000 00:00 0

b75e0000-b7783000 r-xp 00000000 08:06 787152 /lib/i386-linux-gnu/libc-2.15.so

b7783000-b7784000 ---p 001a3000 08:06 787152 /lib/i386-linux-gnu/libc-2.15.so

b7784000-b7786000 r--p 001a3000 08:06 787152 /lib/i386-linux-gnu/libc-2.15.so

b7786000-b7787000 rw-p 001a5000 08:06 787152 /lib/i386-linux-gnu/libc-2.15.so

b7787000-b778a000 rw-p 00000000 00:00 0

b7799000-b779e000 rw-p 00000000 00:00 0

b779e000-b779f000 r-xp 00000000 00:00 0 [vdso]

b779f000-b77bf000 r-xp 00000000 08:06 794147 /lib/i386-linux-gnu/ld-2.15.so

b77bf000-b77c0000 r--p 0001f000 08:06 794147 /lib/i386-linux-gnu/ld-2.15.so

b77c0000-b77c1000 rw-p 00020000 08:06 794147 /lib/i386-linux-gnu/ld-2.15.so

bfaec000-bfb0d000 rw-p 00000000 00:00 0 [stack]

Aborted (core dumped)

Well, this came in as pleasant surprise that the execution environment was somehow able to

detect that buffer overflow could happen in this case. In the output you can see that stack

smashing was detected. This prompted me to explore as to how buffer overflow was detected.

While searching for the reason, I came across a gcc flag -fstack-protector. Here is the

description of this flag (from the man page) :

-fstack-protector

Emit extra code to check for buffer overflows, such as stack smashing attacks. This is done

by adding a guard variable to functions with vulnerable objects. This includes functions that

call alloca, and functions with buffers larger than 8 bytes. The guards are initialized when a

function is entered and then checked when the function exits. If a guard check fails, an

PO PUL AR PO ST S

12 Amazing and Essential Linux Books To Enrich YourBrain and Library

50 UNIX / Linux Sysadmin Tutorials

50 Most Frequently Used UNIX / Linux Commands (With

Examples)

How To Be Productive and Get Things Done Using GTD

30 Things To Do When you are Bored and have a
http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/nagios-core-ebook/http://ad.doubleclick.net/click;h=v8/3d83/0/0/%2a/c;268163866;4-0;0;38965565;4307-300/250;52659571/52613439/1;u=,idgt-11769235851_1360303369,12cdc27fc2892a7,bigdata_db,ax.-bu.-bd.;~aopt=2/1/bd/0;~sscs=%3fhttp://vutelepresence.com/landing-pages/roi/lp-roi.html?source=ibtimeshttp://www.thegeekstuff.com/2009/01/12-amazing-and-essential-linux-books-to-enrich-your-brain-and-library/http://www.thegeekstuff.com/2010/12/50-unix-linux-sysadmin-tutorials/http://www.thegeekstuff.com/2010/11/50-linux-commands/http://www.thegeekstuff.com/2010/08/gtd-getting-things-done/http://www.thegeekstuff.com/2010/03/30-things-to-do-when-you-are-bored-and-have-a-computer/http://www.thegeekstuff.com/2010/03/30-things-to-do-when-you-are-bored-and-have-a-computer/


4/7


error message is printed and the program exits.

NOTE: In Ubuntu 6.10 and later versions this option is enabled by default for C, C++, ObjC,

ObjC++, if none of -fno-stack-protector, -nostdlib, nor -ffreestanding are found.

So you see that gcc has got this flag that emits extra code to check buffer overflows. Now the

next question that came into my mind was that I never included this flag while compilation then

how this functionality got enabled. Then I read the last two lines that said for Ubuntu 6.10 this

functionality is enabled by default.

Then, as a next step, I decided to deactivate this functionality by using the flag -fno-stack-

protector while compilation and then try to execute the same use-case that I was doing earlier.

Here is how I did it :

$ gcc -Wall -fno-stack-protector stacksmash.c -o stacksmash

$ ./stacksmash

Enter the name

TheGeekStuff

len = [26214]

len of string entered is : [12]

So we see that once the code was compiled with this flag then with the same input, the

execution environment was not able to detect buffer overflow that actually happened and

corrupted the value of variable len.

Also, if you are new to gcc, you should understand the most frequently used gcc compiler

Linux Directory Structure (File System Structure)

Explained with Examples

Linux Crontab: 15 Awesome Cron Job Examples

Get a Grip on the Grep! 15 Practical Grep Command

Examples

Unix LS Command: 15 Practical Examples

15 Examples To Master Linux Command Line History

Top 10 Open Source Bug Tracking System

Vi and Vim Macro Tutorial: How To Record and Play

Mommy, I found it! -- 15 Practical Linux Find Command

Examples

15 Awesome Gmail Tips and Tricks

15 Awesome Google Search Tips and Tricks

RAID 0, RAID 1, RAID 5, RAID 10 Explained with

Diagrams

Can You Top This? 15 Practical Linux Top Command

Examples

Top 5 Best System Monitoring Tools

Top 5 Best Linux OS Distributions

How To Monitor Remote Linux Host using Nagios 3.0

Awk Introduction Tutorial 7 Awk Print Examples

How to Backup Linux? 15 rsync Command Examples

The Ultimate Wget Download Guide With 15 Awesome

Examples

Top 5 Best Linux Text Editors

Packet Analyzer: 15 TCPDUMP Command Examples

The Ultimate Bash Array Tutorial with 15 Examples
http://www.thegeekstuff.com/2010/03/30-things-to-do-when-you-are-bored-and-have-a-computer/http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/2012/10/gcc-compiler-options/http://www.thegeekstuff.com/2010/03/30-things-to-do-when-you-are-bored-and-have-a-computer/http://www.thegeekstuff.com/2010/09/linux-file-system-structure/http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/http://www.thegeekstuff.com/2009/03/15-practical-unix-grep-command-examples/http://www.thegeekstuff.com/2009/07/linux-ls-command-examples/http://www.thegeekstuff.com/2008/08/15-examples-to-master-linux-command-line-history/http://www.thegeekstuff.com/2010/08/bug-tracking-system/http://www.thegeekstuff.com/2009/01/vi-and-vim-macro-tutorial-how-to-record-and-play/http://www.thegeekstuff.com/2009/03/15-practical-linux-find-command-examples/http://www.thegeekstuff.com/2009/07/best-gmail-tips-and-tricks/http://www.thegeekstuff.com/2009/06/expertise-in-google-search/http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/http://www.thegeekstuff.com/2010/01/15-practical-unix-linux-top-command-examples/http://www.thegeekstuff.com/2009/09/top-5-best-network-monitoring-tools/http://www.thegeekstuff.com/2009/06/top-5-best-linux-os-distributions/http://www.thegeekstuff.com/2008/06/how-to-monitor-remote-linux-host-using-nagios-30/http://www.thegeekstuff.com/2010/01/awk-introduction-tutorial-7-awk-print-examples/http://www.thegeekstuff.com/2010/09/rsync-command-examples/http://www.thegeekstuff.com/2009/09/the-ultimate-wget-download-guide-with-15-awesome-examples/http://www.thegeekstuff.com/2009/07/top-5-best-linux-text-editors/http://www.thegeekstuff.com/2010/08/tcpdump-command-examples/http://www.thegeekstuff.com/2010/06/bash-array-tutorial/http://www.thegeekstuff.com/2012/10/gcc-compiler-options/


5/7


7 Tweet 1 ShareLike 5

options that we discussed earlier.

Comment

If you enjoyed this article, you might also like..

1. 50 Linux Sysadmin Tutorials2. 50 Most Frequently Used Linux Commands

(With Examples)

3. Top 25 Best Linux Performance Monitoring

and Debugging Tools

4. Mommy, I found it! 15 Practical Linux Find

Command Examples

5. Linux 101 Hacks 2nd Edition eBook

Awk Introduction 7 Awk Print ExamplesAdvanced Sed Substitution Examples

8 Essential Vim Editor Navigation

Fundamentals

25 Most Frequently Used Linux IPTables

Rules Examples

Turbocharge PuTTY with 12 Powerful

Add-Ons

Tags: Buffer Overflow Tutorial , Buffer Overrun Detected, Prevent Buffer Overflow, Stack Smashing Detected

3 Steps to Perform SSH Login Without Password Using

ssh-keygen & ssh-copy-id

Unix Sed Tutorial: Advanced Sed Substitution Examples

UNIX / Linux: 10 Netstat Command Examples

The Ultimate Guide for Creating Strong Passwords

6 Steps to Secure Your Home Wireless Network

Turbocharge PuTTY with 12 Powerful Add-Ons
http://www.thegeekstuff.com/2012/10/gcc-compiler-options/http://www.thegeekstuff.com/2012/10/gcc-compiler-options/http://www.thegeekstuff.com/2012/10/gcc-compiler-options/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttps://twitter.com/intent/tweet?original_referer=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2F%3Futm_source%3Dfeedburner%26utm_medium%3Demail%26utm_campaign%3DFee&text=How%20to%20Avoid%20Stack%20Smashing%20Attacks%20with%20GCC&tw_p=tweetbutton&url=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2Fhttp://twitter.com/search?q=http%3A%2F%2Fwww.thegeekstuff.com%2F2013%2F02%2Fstack-smashing-attacks-gcc%2Fhttp://www.addthis.com/bookmark.php?v=250&pub=xa-4ac6c0d77fc11b75http://www.thegeekstuff.com/2012/10/gcc-compiler-options/http://www.thegeekstuff.com/2010/12/50-unix-linux-sysadmin-tutorials/http://www.thegeekstuff.com/2010/11/50-linux-commands/http://www.thegeekstuff.com/2011/12/linux-performance-monitoring-tools/http://www.thegeekstuff.com/2009/03/15-practical-linux-find-command-examples/http://www.thegeekstuff.com/linux-101-hacks-ebook/http://www.thegeekstuff.com/2010/01/awk-introduction-tutorial-7-awk-print-examples/http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-advanced-sed-substitution-examples/http://www.thegeekstuff.com/2009/03/8-essential-vim-editor-navigation-fundamentals/http://www.thegeekstuff.com/2011/06/iptables-rules-examples/http://www.thegeekstuff.com/2008/08/turbocharge-putty-with-12-powerful-add-ons-software-for-geeks-3/http://www.thegeekstuff.com/bash-101-hacks-ebook/http://www.thegeekstuff.com/sed-awk-101-hacks-ebook/http://www.thegeekstuff.com/nagios-core-ebook/http://www.thegeekstuff.com/vim-101-hacks-ebook/http://www.thegeekstuff.com/tag/buffer-overflow-tutorial/http://www.thegeekstuff.com/tag/buffer-overrun-detected/http://www.thegeekstuff.com/tag/prevent-buffer-overflow/http://www.thegeekstuff.com/tag/stack-smashing-detected/http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-advanced-sed-substitution-examples/http://www.thegeekstuff.com/2010/03/netstat-command-examples/http://www.thegeekstuff.com/2008/06/the-ultimate-guide-for-creating-strong-passwords/http://www.thegeekstuff.com/2008/08/6-steps-to-secure-your-home-wireless-network/http://www.thegeekstuff.com/2008/08/turbocharge-putty-with-12-powerful-add-ons-software-for-geeks-3/


6/7


Leave a Comment

Name

E-mail

Website

Notify me of followup comments via e-mail

Submit

P R E V I O U S P O S T : How to Encrypt and Decrypt a File using GnuPG in Linux

About The Geek Stuff

My name is Ramesh Natarajan. I

will be posting instruction guides,

how-to, troubleshooting tips and

tricks on Linux, database, hardware,

security and web. My focus is to

Support Us

Support this blog by purchasing one of my

ebooks.

Bash 101 Hacks eBook

Contact Us

Email Me : Use this Contact Form to get in

touch me with your comments, questions or

suggestions about this site. You can also simply

drop me a line to say hello!.
http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/2013/02/gpg-encrypt-decrypt/http://www.thegeekstuff.com/bash-101-hacks-ebook/http://www.thegeekstuff.com/contact


7/7

df d mi b PRO i Are you a developer? Try out the HTML to PDF API

write articles that will either teach

you or help you resolve a problem.

Read more about Ramesh Natarajan and the blog.

Sed and Awk 101 Hacks eBook

Vim 101 Hacks eBook

Nagios Core 3 eBook

Follow us on Twitter

Become a fan on Facebook

Copyright 20082013 Rames h Natarajan. All rights reserved | Terms of Service |Advertise
http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fwww.thegeekstuff.com%2f2013%2f02%2fstack-smashing-attacks-gcc%2f%3futm_source%3dfeedburner%26utm_medium%3demail%26utm_campaign%3dFee&id=ma-130208010252-bfa24504http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://www.thegeekstuff.com/about/http://www.thegeekstuff.com/sed-awk-101-hacks-ebook/http://www.thegeekstuff.com/vim-101-hacks-ebook/http://www.thegeekstuff.com/nagios-core-ebook/http://twitter.com/thegeekstuffhttp://www.thegeekstuff.com/2013/02/stack-smashing-attacks-gcc/http://www.facebook.com/thegeekstuffhttp://www.thegeekstuff.com/copyrighthttp://www.thegeekstuff.com/advertisehttp://ad.doubleclick.net/click%3Bh%3Dv8/3d83/3/0/%2a/u%3B268287010%3B1-0%3B0%3B94138081%3B3454-728/90%3B52196442/52156090/1%3Bu%3D%2Cidgt-11472136352_1360303370%2C12cdc27fc2892a7%2Cbigdata_db%2Cax.-bu.-bd.-idgt.bigdata_db_l%3B~aopt%3D0/ff/bd/ff%3B~fdr%3D268329592%3B0-0%3B0%3B38965644%3B3454-728/90%3B52713871/52667064/1%3Bu%3D%2Cidgt-11472136352_1360303370%2C12cdc27fc2892a7%2Cbigdata_db%2Cax.-bu.-bd.-idgt.bigdata_db_l%3B~aopt%3D2/1/bd/0%3B~sscs%3D%3fhttp://try.quickbase.intuit.com/displaybrand

Documents

Www Thegeekstuff Com 2013 02 Stack Smashing Attacks Gcc Utm