From 65ccd641bacea33be23d51da737c2de7543d0f5e Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Mon, 20 Dec 2021 08:41:55 -0300 Subject: debug: Remove catchsegv and libSegfault (BZ #14913) Trapping SIGSEGV within the process is error-prone, adds security issues, and modern analysis design tends to happen out of the process (either by attaching a debugger or by post-mortem analysis). The libSegfault also has some design problems, it uses non async-signal-safe function (backtrace) on signal handler. There are multiple alternatives if users do want to use similar functionality, such as sigsegv gnulib module or libsegfault. --- sysdeps/unix/sysv/linux/i386/register-dump.h | 250 --------------------------- 1 file changed, 250 deletions(-) delete mode 100644 sysdeps/unix/sysv/linux/i386/register-dump.h (limited to 'sysdeps/unix/sysv/linux/i386') diff --git a/sysdeps/unix/sysv/linux/i386/register-dump.h b/sysdeps/unix/sysv/linux/i386/register-dump.h deleted file mode 100644 index 612424b2c5..0000000000 --- a/sysdeps/unix/sysv/linux/i386/register-dump.h +++ /dev/null @@ -1,250 +0,0 @@ -/* Dump registers. - Copyright (C) 1998-2022 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -#include -#include <_itoa.h> - -/* We will print the register dump in this format: - - EAX: XXXXXXXX EBX: XXXXXXXX ECX: XXXXXXXX EDX: XXXXXXXX - ESI: XXXXXXXX EDI: XXXXXXXX EBP: XXXXXXXX ESP: XXXXXXXX - - EIP: XXXXXXXX EFLAGS: XXXXXXXX - - CS: XXXX DS: XXXX ES: XXXX FS: XXXX GS: XXXX SS: XXXX - - Trap: XXXXXXXX Error: XXXXXXXX OldMask: XXXXXXXX - ESP/SIGNAL: XXXXXXXX CR2: XXXXXXXX - - FPUCW: XXXXXXXX FPUSW: XXXXXXXX TAG: XXXXXXXX - IPOFF: XXXXXXXX CSSEL: XXXX DATAOFF: XXXXXXXX DATASEL: XXXX - - ST(0) XXXX XXXXXXXXXXXXXXXX ST(1) XXXX XXXXXXXXXXXXXXXX - ST(2) XXXX XXXXXXXXXXXXXXXX ST(3) XXXX XXXXXXXXXXXXXXXX - ST(4) XXXX XXXXXXXXXXXXXXXX ST(5) XXXX XXXXXXXXXXXXXXXX - ST(6) XXXX XXXXXXXXXXXXXXXX ST(7) XXXX XXXXXXXXXXXXXXXX - - */ - -static void -hexvalue (unsigned long int value, char *buf, size_t len) -{ - char *cp = _itoa_word (value, buf + len, 16, 0); - while (cp > buf) - *--cp = '0'; -} - -static void -register_dump (int fd, struct ucontext_t *ctx) -{ - char regs[21][8]; - char fpregs[31][8]; - struct iovec iov[97]; - size_t nr = 0; - -#define ADD_STRING(str) \ - iov[nr].iov_base = (char *) str; \ - iov[nr].iov_len = strlen (str); \ - ++nr -#define ADD_MEM(str, len) \ - iov[nr].iov_base = str; \ - iov[nr].iov_len = len; \ - ++nr - - /* Generate strings of register contents. */ - hexvalue (ctx->uc_mcontext.gregs[REG_EAX], regs[0], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_EBX], regs[1], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_ECX], regs[2], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_EDX], regs[3], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_ESI], regs[4], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_EDI], regs[5], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_EBP], regs[6], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_ESP], regs[7], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_EIP], regs[8], 8); - hexvalue (ctx->uc_flags, regs[9], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_CS], regs[10], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_DS], regs[11], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_ES], regs[12], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_FS], regs[13], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_GS], regs[14], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_SS], regs[15], 4); - hexvalue (ctx->uc_mcontext.gregs[REG_TRAPNO], regs[16], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_ERR], regs[17], 8); - hexvalue (ctx->uc_mcontext.oldmask, regs[18], 8); - hexvalue (ctx->uc_mcontext.gregs[REG_UESP], regs[19], 8); - hexvalue (ctx->uc_mcontext.cr2, regs[20], 8); - - /* Generate the output. */ - ADD_STRING ("Register dump:\n\n EAX: "); - ADD_MEM (regs[0], 8); - ADD_STRING (" EBX: "); - ADD_MEM (regs[1], 8); - ADD_STRING (" ECX: "); - ADD_MEM (regs[2], 8); - ADD_STRING (" EDX: "); - ADD_MEM (regs[3], 8); - ADD_STRING ("\n ESI: "); - ADD_MEM (regs[4], 8); - ADD_STRING (" EDI: "); - ADD_MEM (regs[5], 8); - ADD_STRING (" EBP: "); - ADD_MEM (regs[6], 8); - ADD_STRING (" ESP: "); - ADD_MEM (regs[7], 8); - ADD_STRING ("\n\n EIP: "); - ADD_MEM (regs[8], 8); - ADD_STRING (" EFLAGS: "); - ADD_MEM (regs[9], 8); - ADD_STRING ("\n\n CS: "); - ADD_MEM (regs[10], 4); - ADD_STRING (" DS: "); - ADD_MEM (regs[11], 4); - ADD_STRING (" ES: "); - ADD_MEM (regs[12], 4); - ADD_STRING (" FS: "); - ADD_MEM (regs[13], 4); - ADD_STRING (" GS: "); - ADD_MEM (regs[14], 4); - ADD_STRING (" SS: "); - ADD_MEM (regs[15], 4); - ADD_STRING ("\n\n Trap: "); - ADD_MEM (regs[16], 8); - ADD_STRING (" Error: "); - ADD_MEM (regs[17], 8); - ADD_STRING (" OldMask: "); - ADD_MEM (regs[18], 8); - ADD_STRING ("\n ESP/signal: "); - ADD_MEM (regs[19], 8); - ADD_STRING (" CR2: "); - ADD_MEM (regs[20], 8); - - /* Generate output for the FPU control/status registers. */ - hexvalue (ctx->__fpregs_mem.cw, fpregs[0], 8); - hexvalue (ctx->__fpregs_mem.sw, fpregs[1], 8); - hexvalue (ctx->__fpregs_mem.tag, fpregs[2], 8); - hexvalue (ctx->__fpregs_mem.ipoff, fpregs[3], 8); - hexvalue (ctx->__fpregs_mem.cssel, fpregs[4], 4); - hexvalue (ctx->__fpregs_mem.dataoff, fpregs[5], 8); - hexvalue (ctx->__fpregs_mem.datasel, fpregs[6], 4); - - ADD_STRING ("\n\n FPUCW: "); - ADD_MEM (fpregs[0], 8); - ADD_STRING (" FPUSW: "); - ADD_MEM (fpregs[1], 8); - ADD_STRING (" TAG: "); - ADD_MEM (fpregs[2], 8); - ADD_STRING ("\n IPOFF: "); - ADD_MEM (fpregs[3], 8); - ADD_STRING (" CSSEL: "); - ADD_MEM (fpregs[4], 4); - ADD_STRING (" DATAOFF: "); - ADD_MEM (fpregs[5], 8); - ADD_STRING (" DATASEL: "); - ADD_MEM (fpregs[6], 4); - - /* Now the real FPU registers. */ - hexvalue (ctx->__fpregs_mem._st[0].exponent, fpregs[7], 8); - hexvalue (ctx->__fpregs_mem._st[0].significand[3] << 16 - | ctx->__fpregs_mem._st[0].significand[2], fpregs[8], 8); - hexvalue (ctx->__fpregs_mem._st[0].significand[1] << 16 - | ctx->__fpregs_mem._st[0].significand[0], fpregs[9], 8); - hexvalue (ctx->__fpregs_mem._st[1].exponent, fpregs[10], 8); - hexvalue (ctx->__fpregs_mem._st[1].significand[3] << 16 - | ctx->__fpregs_mem._st[1].significand[2], fpregs[11], 8); - hexvalue (ctx->__fpregs_mem._st[1].significand[1] << 16 - | ctx->__fpregs_mem._st[1].significand[0], fpregs[12], 8); - hexvalue (ctx->__fpregs_mem._st[2].exponent, fpregs[13], 8); - hexvalue (ctx->__fpregs_mem._st[2].significand[3] << 16 - | ctx->__fpregs_mem._st[2].significand[2], fpregs[14], 8); - hexvalue (ctx->__fpregs_mem._st[2].significand[1] << 16 - | ctx->__fpregs_mem._st[2].significand[0], fpregs[15], 8); - hexvalue (ctx->__fpregs_mem._st[3].exponent, fpregs[16], 8); - hexvalue (ctx->__fpregs_mem._st[3].significand[3] << 16 - | ctx->__fpregs_mem._st[3].significand[2], fpregs[17], 8); - hexvalue (ctx->__fpregs_mem._st[3].significand[1] << 16 - | ctx->__fpregs_mem._st[3].significand[0], fpregs[18], 8); - hexvalue (ctx->__fpregs_mem._st[4].exponent, fpregs[19], 8); - hexvalue (ctx->__fpregs_mem._st[4].significand[3] << 16 - | ctx->__fpregs_mem._st[4].significand[2], fpregs[20], 8); - hexvalue (ctx->__fpregs_mem._st[4].significand[1] << 16 - | ctx->__fpregs_mem._st[4].significand[0], fpregs[21], 8); - hexvalue (ctx->__fpregs_mem._st[5].exponent, fpregs[22], 8); - hexvalue (ctx->__fpregs_mem._st[5].significand[3] << 16 - | ctx->__fpregs_mem._st[5].significand[2], fpregs[23], 8); - hexvalue (ctx->__fpregs_mem._st[5].significand[1] << 16 - | ctx->__fpregs_mem._st[5].significand[0], fpregs[24], 8); - hexvalue (ctx->__fpregs_mem._st[6].exponent, fpregs[25], 8); - hexvalue (ctx->__fpregs_mem._st[6].significand[3] << 16 - | ctx->__fpregs_mem._st[6].significand[2], fpregs[26], 8); - hexvalue (ctx->__fpregs_mem._st[6].significand[1] << 16 - | ctx->__fpregs_mem._st[6].significand[0], fpregs[27], 8); - hexvalue (ctx->__fpregs_mem._st[7].exponent, fpregs[28], 8); - hexvalue (ctx->__fpregs_mem._st[7].significand[3] << 16 - | ctx->__fpregs_mem._st[7].significand[2], fpregs[29], 8); - hexvalue (ctx->__fpregs_mem._st[7].significand[1] << 16 - | ctx->__fpregs_mem._st[7].significand[0], fpregs[30], 8); - - ADD_STRING ("\n\n ST(0) "); - ADD_MEM (fpregs[7], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[8], 8); - ADD_MEM (fpregs[9], 8); - ADD_STRING (" ST(1) "); - ADD_MEM (fpregs[10], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[11], 8); - ADD_MEM (fpregs[12], 8); - ADD_STRING ("\n ST(2) "); - ADD_MEM (fpregs[13], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[14], 8); - ADD_MEM (fpregs[15], 8); - ADD_STRING (" ST(3) "); - ADD_MEM (fpregs[16], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[17], 8); - ADD_MEM (fpregs[18], 8); - ADD_STRING ("\n ST(4) "); - ADD_MEM (fpregs[19], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[20], 8); - ADD_MEM (fpregs[21], 8); - ADD_STRING (" ST(5) "); - ADD_MEM (fpregs[22], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[23], 8); - ADD_MEM (fpregs[24], 8); - ADD_STRING ("\n ST(6) "); - ADD_MEM (fpregs[25], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[26], 8); - ADD_MEM (fpregs[27], 8); - ADD_STRING (" ST(7) "); - ADD_MEM (fpregs[28], 4); - ADD_STRING (" "); - ADD_MEM (fpregs[29], 8); - ADD_MEM (fpregs[30], 8); - - ADD_STRING ("\n"); - - /* Write the stuff out. */ - writev (fd, iov, nr); -} - - -#define REGISTER_DUMP register_dump (fd, ctx) -- cgit 1.4.1