https://sourceware.org/bugzilla/show_bug.cgi?id=30877
Bug ID: 30877 Summary: [BUG][RISCV]relro protection not working in riscv Product: binutils Version: 2.40 Status: NEW Severity: normal Priority: P2 Component: ld Assignee: unassigned at sourceware dot org Reporter: akhilesh.k at samsung dot com Target Milestone: --- below linker issue reported in gcc https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111518 > Andreas Schwab 2023-09-21 13:21:49 UTC > That's a linker bug, please report to https://sourceware.org/bugzilla/. ================================================================================ -z,relro and/or -z,now flag not working on riscv arch. Address of printf overwritten to custom address passed as argument, but it expected to be readonly when full relro protection is enabled Test code to reproduce(test_relro.c): ----------------------------------------------- #include <stdio.h> #include <stdlib.h> int main(int argc, int *argv[]) { size_t *p = (size_t *) strtol(argv[1], NULL, 16); p[0] = 0xdeadbeef; printf("RELRO: %p\n", p); return 0; } ----------------------------------------------- Steps to reproduce: 1. Turn off ASLR: echo 0 > /proc/sys/kernel/randomise_va_space 1. Compile with -z,relro,-z,now flag: gcc -g -Wl,-z,relro,-z,now -O0 -o test_partial test_relro.c 2. Check printf address in GOT: sattdeepan@sri-9052:~$ objdump -R test_partial | grep printf 0000000000012020 R_RISCV_JUMP_SLOT printf@GLIBC_2.27 3. Running with gdb: gdb -q test_partial 4. Get load address of printf function: <base address of main> - <main offset> + <printf offset in GOT> 0x10586 - 0x10586 + 0x12020 ==> 0x12020 5. Pass load address of main as argument gdb-peda$ r 0x12020 Starting program: /home/user/test_full_riscv 0x12020 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/riscv64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. Warning: 'set logging off', an alias for the command 'set logging enabled', is deprecated. Use 'set logging enabled off'. Warning: 'set logging on', an alias for the command 'set logging enabled', is deprecated. Use 'set logging enabled on'. 0x00000000deadbeee in ?? () ====> address of printf overwritten to custom address passed as argument, but it expected to be readonly gdb-peda$ ================================================================================ -- You are receiving this mail because: You are on the CC list for the bug.