// SPDX-License-Identifier: GPL-2.0+ /* * Ptrace test for Memory Protection Key registers * * Copyright ( C ) 2015 Anshuman Khandual , IBM Corporation . * Copyright ( C ) 2018 IBM Corporation . #include "ptrace.h" #include "child.h" #include "pkeys.h" static const char user_read[] = "[User Read (Running)]" ;static const char user_write[] = "[User Write (Running)]" ;static const char ptrace_read_running[] = "[Ptrace Read (Running)]" ;static const char ptrace_write_running[] = "[Ptrace Write (Running)]" ;/* Information shared between the parent and the child. */ struct shared_info {struct child_sync child_sync;/* AMR value the parent expects to read from the child. */ unsigned long amr1;/* AMR value the parent is expected to write to the child. */ unsigned long amr2;/* AMR value that ptrace should refuse to write to the child. */ unsigned long invalid_amr;/* IAMR value the parent expects to read from the child. */ unsigned long expected_iamr;/* UAMOR value the parent expects to read from the child. */ unsigned long expected_uamor;/* * IAMR and UAMOR values that ptrace should refuse to write to the child * ( even though they ' re valid ones ) because userspace doesn ' t have * access to those registers . unsigned long invalid_iamr;unsigned long invalid_uamor;static int child(struct shared_info *info)unsigned long reg;bool disable_execute = true ;int pkey1, pkey2, pkey3;int ret;/* Wait until parent fills out the initial register values. */ if (ret)return ret;/* Get some pkeys so that we can change their bits in the AMR. */ 0 , PKEY_DISABLE_EXECUTE);if (pkey1 < 0 ) {0 , PKEY_UNRESTRICTED);0 , &info->child_sync);false ;0 , PKEY_UNRESTRICTED);0 , &info->child_sync);0 , PKEY_UNRESTRICTED);0 , &info->child_sync);3 ul << pkeyshift(pkey1);3 ul << pkeyshift(pkey2);/* * invalid amr value where we try to force write * things which are deined by a uamor setting . 0 x0UL & ~info->expected_uamor);/* * if PKEY_DISABLE_EXECUTE succeeded we should update the expected_iamr if (disable_execute)1 ul << pkeyshift(pkey1);else 1 ul << pkeyshift(pkey1));/* * We allocated pkey2 and pkey 3 above . Clear the IAMR bits . 1 ul << pkeyshift(pkey2));1 ul << pkeyshift(pkey3));/* * Create an IAMR value different from expected value . * Kernel will reject an IAMR and UAMOR change . 1 ul << pkeyshift(pkey1) | 1 ul << pkeyshift(pkey2));0 x3ul << pkeyshift(pkey1));"%-30s AMR: %016lx pkey1: %d pkey2: %d pkey3: %d\n" ,/* Wait for parent to read our AMR value and write a new one. */ if (ret)return ret;"%-30s AMR: %016lx\n" , user_read, reg);/* * Wait for parent to try to write an invalid AMR value . if (ret)return ret;"%-30s AMR: %016lx\n" , user_read, reg);/* * Wait for parent to try to write an IAMR and a UAMOR value . We can ' t * verify them , but we can verify that the AMR didn ' t change . if (ret)return ret;"%-30s AMR: %016lx\n" , user_read, reg);/* Now let parent now that we are finished. */ return TEST_PASS;static int parent(struct shared_info *info, pid_t pid)unsigned long regs[3 ];int ret, status;/* * Get the initial values for AMR , IAMR and UAMOR and communicate them * to the child . 3 );"PKEYs not supported" );0 ];1 ];2 ];/* Wake up child so that it can set itself up. */ if (ret)return ret;/* Verify that we can read the pkey registers from the child. */ 3 );"%-30s AMR: %016lx IAMR: %016lx UAMOR: %016lx\n" ,0 ], regs[1 ], regs[2 ]);0 ] != info->amr1, &info->child_sync);1 ] != info->expected_iamr, &info->child_sync);2 ] != info->expected_uamor, &info->child_sync);/* Write valid AMR value in child. */ 1 );"%-30s AMR: %016lx\n" , ptrace_write_running, info->amr2);/* Wake up child so that it can verify it changed. */ if (ret)return ret;/* Write invalid AMR value in child. */ 1 );"%-30s AMR: %016lx\n" , ptrace_write_running, info->invalid_amr);/* Wake up child so that it can verify it didn't change. */ if (ret)return ret;/* Try to write to IAMR. */ 0 ] = info->amr1;1 ] = info->invalid_iamr;2 );"%-30s AMR: %016lx IAMR: %016lx\n" ,0 ], regs[1 ]);/* Try to write to IAMR and UAMOR. */ 2 ] = info->invalid_uamor;3 );"%-30s AMR: %016lx IAMR: %016lx UAMOR: %016lx\n" ,0 ], regs[1 ], regs[2 ]);/* Verify that all registers still have their expected values. */ 3 );"%-30s AMR: %016lx IAMR: %016lx UAMOR: %016lx\n" ,0 ], regs[1 ], regs[2 ]);0 ] != info->amr2, &info->child_sync);1 ] != info->expected_iamr, &info->child_sync);2 ] != info->expected_uamor, &info->child_sync);/* Wake up child so that it can verify AMR didn't change and wrap up. */ if (ret != pid) {"Child's exit status not captured\n" );else if (!WIFEXITED(status)) {"Child exited abnormally\n" );else return ret;static int ptrace_pkey(void )struct shared_info *info;int shm_id;int ret;sizeof (*info), 0777 | IPC_CREAT);0 );if (ret)return ret;if (pid < 0 ) {"fork() failed" );else if (pid == 0 )else if (pid) {return ret;int main(int argc, char *argv[])return test_harness(ptrace_pkey, "ptrace_pkey" );
Messung V0.5 in Prozent C=91 H=100 G=95
¤ Dauer der Verarbeitung: 0.8 Sekunden
(vorverarbeitet am 2026-10-12)
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