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214 lines
4.7 KiB
214 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/compiler.h> |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <sys/user.h> |
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#include <syscall.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/ptrace.h> |
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#include <asm/ptrace.h> |
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#include <errno.h> |
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#include "debug.h" |
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#include "tests/tests.h" |
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#include "arch-tests.h" |
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static noinline int bp_1(void) |
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{ |
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pr_debug("in %s\n", __func__); |
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return 0; |
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} |
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static noinline int bp_2(void) |
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{ |
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pr_debug("in %s\n", __func__); |
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return 0; |
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} |
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static int spawn_child(void) |
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{ |
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int child = fork(); |
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if (child == 0) { |
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/* |
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* The child sets itself for as tracee and |
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* waits in signal for parent to trace it, |
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* then it calls bp_1 and quits. |
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*/ |
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int err = ptrace(PTRACE_TRACEME, 0, NULL, NULL); |
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if (err) { |
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pr_debug("failed to PTRACE_TRACEME\n"); |
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exit(1); |
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} |
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raise(SIGCONT); |
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bp_1(); |
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exit(0); |
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} |
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return child; |
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} |
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/* |
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* This tests creates HW breakpoint, tries to |
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* change it and checks it was properly changed. |
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*/ |
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static int bp_modify1(void) |
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{ |
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pid_t child; |
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int status; |
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unsigned long rip = 0, dr7 = 1; |
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child = spawn_child(); |
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waitpid(child, &status, 0); |
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if (WIFEXITED(status)) { |
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pr_debug("tracee exited prematurely 1\n"); |
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return TEST_FAIL; |
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} |
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/* |
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* The parent does following steps: |
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* - creates a new breakpoint (id 0) for bp_2 function |
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* - changes that breakpoint to bp_1 function |
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* - waits for the breakpoint to hit and checks |
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* it has proper rip of bp_1 function |
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* - detaches the child |
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*/ |
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if (ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[0]), bp_2)) { |
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pr_debug("failed to set breakpoint, 1st time: %s\n", |
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strerror(errno)); |
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goto out; |
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} |
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if (ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[0]), bp_1)) { |
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pr_debug("failed to set breakpoint, 2nd time: %s\n", |
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strerror(errno)); |
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goto out; |
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} |
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if (ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[7]), dr7)) { |
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pr_debug("failed to set dr7: %s\n", strerror(errno)); |
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goto out; |
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} |
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if (ptrace(PTRACE_CONT, child, NULL, NULL)) { |
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pr_debug("failed to PTRACE_CONT: %s\n", strerror(errno)); |
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goto out; |
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} |
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waitpid(child, &status, 0); |
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if (WIFEXITED(status)) { |
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pr_debug("tracee exited prematurely 2\n"); |
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return TEST_FAIL; |
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} |
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rip = ptrace(PTRACE_PEEKUSER, child, |
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offsetof(struct user_regs_struct, rip), NULL); |
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if (rip == (unsigned long) -1) { |
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pr_debug("failed to PTRACE_PEEKUSER: %s\n", |
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strerror(errno)); |
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goto out; |
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} |
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pr_debug("rip %lx, bp_1 %p\n", rip, bp_1); |
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out: |
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if (ptrace(PTRACE_DETACH, child, NULL, NULL)) { |
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pr_debug("failed to PTRACE_DETACH: %s", strerror(errno)); |
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return TEST_FAIL; |
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} |
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return rip == (unsigned long) bp_1 ? TEST_OK : TEST_FAIL; |
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} |
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/* |
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* This tests creates HW breakpoint, tries to |
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* change it to bogus value and checks the original |
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* breakpoint is hit. |
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*/ |
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static int bp_modify2(void) |
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{ |
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pid_t child; |
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int status; |
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unsigned long rip = 0, dr7 = 1; |
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child = spawn_child(); |
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waitpid(child, &status, 0); |
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if (WIFEXITED(status)) { |
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pr_debug("tracee exited prematurely 1\n"); |
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return TEST_FAIL; |
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} |
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/* |
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* The parent does following steps: |
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* - creates a new breakpoint (id 0) for bp_1 function |
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* - tries to change that breakpoint to (-1) address |
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* - waits for the breakpoint to hit and checks |
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* it has proper rip of bp_1 function |
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* - detaches the child |
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*/ |
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if (ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[0]), bp_1)) { |
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pr_debug("failed to set breakpoint: %s\n", |
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strerror(errno)); |
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goto out; |
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} |
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if (ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[7]), dr7)) { |
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pr_debug("failed to set dr7: %s\n", strerror(errno)); |
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goto out; |
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} |
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if (!ptrace(PTRACE_POKEUSER, child, |
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offsetof(struct user, u_debugreg[0]), (unsigned long) (-1))) { |
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pr_debug("failed, breakpoint set to bogus address\n"); |
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goto out; |
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} |
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if (ptrace(PTRACE_CONT, child, NULL, NULL)) { |
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pr_debug("failed to PTRACE_CONT: %s\n", strerror(errno)); |
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goto out; |
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} |
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waitpid(child, &status, 0); |
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if (WIFEXITED(status)) { |
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pr_debug("tracee exited prematurely 2\n"); |
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return TEST_FAIL; |
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} |
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rip = ptrace(PTRACE_PEEKUSER, child, |
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offsetof(struct user_regs_struct, rip), NULL); |
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if (rip == (unsigned long) -1) { |
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pr_debug("failed to PTRACE_PEEKUSER: %s\n", |
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strerror(errno)); |
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goto out; |
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} |
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pr_debug("rip %lx, bp_1 %p\n", rip, bp_1); |
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out: |
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if (ptrace(PTRACE_DETACH, child, NULL, NULL)) { |
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pr_debug("failed to PTRACE_DETACH: %s", strerror(errno)); |
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return TEST_FAIL; |
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} |
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return rip == (unsigned long) bp_1 ? TEST_OK : TEST_FAIL; |
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} |
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int test__bp_modify(struct test *test __maybe_unused, |
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int subtest __maybe_unused) |
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{ |
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TEST_ASSERT_VAL("modify test 1 failed\n", !bp_modify1()); |
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TEST_ASSERT_VAL("modify test 2 failed\n", !bp_modify2()); |
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return 0; |
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}
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