Buildresult: linus/se7619_defconfig/sh4-gcc10 built on May 13 2021, 05:42

kisskb

Revisions | Branches | Compilers | Configs | Build Results | Build Failures |

Status:	OK
Date/Time:	May 13 2021, 05:42
Duration:	0:00:19.956402
Builder:	ka4
Revision:	ptrace: make ptrace() fail if the tracee changed its pid unexpectedly (`dbb5afad100a828c97e012c6106566d99f041db6)`
Target:	linus/se7619_defconfig/sh4-gcc10
Branch:	linus
Compiler:	sh4-gcc10 (sh4-linux-gcc (GCC) 10.1.0 / GNU ld (GNU Binutils) 2.34)
Config:	se7619_defconfig (download)
Log:	Download original Possible warnings (7) <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] arch/sh/kernel/traps.c:183:15: warning: unused variable 'cpu' [-Wunused-variable] include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] drivers/tty/serial/sh-sci.c:2666:19: warning: unused variable 'sport' [-Wunused-variable] Full Log # git rev-parse -q --verify dbb5afad100a828c97e012c6106566d99f041db6^{commit} dbb5afad100a828c97e012c6106566d99f041db6 already have revision, skipping fetch # git checkout -q -f -B kisskb dbb5afad100a828c97e012c6106566d99f041db6 # git clean -qxdf # < git log -1 # commit dbb5afad100a828c97e012c6106566d99f041db6 # Author: Oleg Nesterov <oleg@redhat.com> # Date: Wed May 12 15:33:08 2021 +0200 # # ptrace: make ptrace() fail if the tracee changed its pid unexpectedly # # Suppose we have 2 threads, the group-leader L and a sub-theread T, # both parked in ptrace_stop(). Debugger tries to resume both threads # and does # # ptrace(PTRACE_CONT, T); # ptrace(PTRACE_CONT, L); # # If the sub-thread T execs in between, the 2nd PTRACE_CONT doesn not # resume the old leader L, it resumes the post-exec thread T which was # actually now stopped in PTHREAD_EVENT_EXEC. In this case the # PTHREAD_EVENT_EXEC event is lost, and the tracer can't know that the # tracee changed its pid. # # This patch makes ptrace() fail in this case until debugger does wait() # and consumes PTHREAD_EVENT_EXEC which reports old_pid. This affects all # ptrace requests except the "asynchronous" PTRACE_INTERRUPT/KILL. # # The patch doesn't add the new PTRACE_ option to not complicate the API, # and I _hope_ this won't cause any noticeable regression: # # - If debugger uses PTRACE_O_TRACEEXEC and the thread did an exec # and the tracer does a ptrace request without having consumed # the exec event, it's 100% sure that the thread the ptracer # thinks it is targeting does not exist anymore, or isn't the # same as the one it thinks it is targeting. # # - To some degree this patch adds nothing new. In the scenario # above ptrace(L) can fail with -ESRCH if it is called after the # execing sub-thread wakes the leader up and before it "steals" # the leader's pid. # # Test-case: # # #include <stdio.h> # #include <unistd.h> # #include <signal.h> # #include <sys/ptrace.h> # #include <sys/wait.h> # #include <errno.h> # #include <pthread.h> # #include <assert.h> # # void tf(void arg) # { # execve("/usr/bin/true", NULL, NULL); # assert(0); # # return NULL; # } # # int main(void) # { # int leader = fork(); # if (!leader) { # kill(getpid(), SIGSTOP); # # pthread_t th; # pthread_create(&th, NULL, tf, NULL); # for (;;) # pause(); # # return 0; # } # # waitpid(leader, NULL, WSTOPPED); # # ptrace(PTRACE_SEIZE, leader, 0, # PTRACE_O_TRACECLONE \| PTRACE_O_TRACEEXEC); # waitpid(leader, NULL, 0); # # ptrace(PTRACE_CONT, leader, 0,0); # waitpid(leader, NULL, 0); # # int status, thread = waitpid(-1, &status, 0); # assert(thread > 0 && thread != leader); # assert(status == 0x80137f); # # ptrace(PTRACE_CONT, thread, 0,0); # /* # * waitid() because waitpid(leader, &status, WNOWAIT) does not # * report status. Why ???? # * # * Why WEXITED? because we have another kernel problem connected # * to mt-exec. # / # siginfo_t info; # assert(waitid(P_PID, leader, &info, WSTOPPED\|WEXITED\|WNOWAIT) == 0); # assert(info.si_pid == leader && info.si_status == 0x0405); # # / OK, it sleeps in ptrace(PTRACE_EVENT_EXEC == 0x04) / # assert(ptrace(PTRACE_CONT, leader, 0,0) == -1); # assert(errno == ESRCH); # # assert(leader == waitpid(leader, &status, WNOHANG)); # assert(status == 0x04057f); # # assert(ptrace(PTRACE_CONT, leader, 0,0) == 0); # # return 0; # } # # Signed-off-by: Oleg Nesterov <oleg@redhat.com> # Reported-by: Simon Marchi <simon.marchi@efficios.com> # Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> # Acked-by: Pedro Alves <palves@redhat.com> # Acked-by: Simon Marchi <simon.marchi@efficios.com> # Acked-by: Jan Kratochvil <jan.kratochvil@redhat.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux-ld --version # < git log --format=%s --max-count=1 dbb5afad100a828c97e012c6106566d99f041db6 # < make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7619_defconfig_sh4-gcc10 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux- se7619_defconfig # < make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7619_defconfig_sh4-gcc10 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux- help # make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7619_defconfig_sh4-gcc10 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux- olddefconfig # make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7619_defconfig_sh4-gcc10 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-10.1.0-nolibc/sh4-linux/bin/sh4-linux- Generating include/generated/machtypes.h <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] /kisskb/src/arch/sh/kernel/traps.c: In function 'nmi_trap_handler': /kisskb/src/arch/sh/kernel/traps.c:183:15: warning: unused variable 'cpu' [-Wunused-variable] 183 \| unsigned int cpu = smp_processor_id(); \| ^~~ In file included from /kisskb/src/arch/sh/include/asm/hw_irq.h:6, from /kisskb/src/include/linux/irq.h:589, from /kisskb/src/include/asm-generic/hardirq.h:17, from /kisskb/src/arch/sh/include/asm/hardirq.h:9, from /kisskb/src/include/linux/hardirq.h:11, from /kisskb/src/include/linux/interrupt.h:11, from /kisskb/src/include/linux/serial_core.h:13, from /kisskb/src/include/linux/serial_sci.h:6, from /kisskb/src/arch/sh/kernel/cpu/sh2/setup-sh7619.c:11: /kisskb/src/include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] 100 \| #define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(a) \| ^ /kisskb/src/include/linux/sh_intc.h:105:24: note: in expansion of macro '_INTC_ARRAY' 105 \| _INTC_ARRAY(vectors), _INTC_ARRAY(groups), \ \| ^~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:124:8: note: in expansion of macro 'INTC_HW_DESC' 124 \| .hw = INTC_HW_DESC(vectors, groups, mask_regs, \ \| ^~~~~~~~~~~~ /kisskb/src/arch/sh/kernel/cpu/sh2/setup-sh7619.c:58:8: note: in expansion of macro 'DECLARE_INTC_DESC' 58 \| static DECLARE_INTC_DESC(intc_desc, "sh7619", vectors, NULL, \| ^~~~~~~~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] 100 \| #define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(a) \| ^ /kisskb/src/include/linux/sh_intc.h:106:2: note: in expansion of macro '_INTC_ARRAY' 106 \| _INTC_ARRAY(mask_regs), _INTC_ARRAY(prio_regs), \ \| ^~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:124:8: note: in expansion of macro 'INTC_HW_DESC' 124 \| .hw = INTC_HW_DESC(vectors, groups, mask_regs, \ \| ^~~~~~~~~~~~ /kisskb/src/arch/sh/kernel/cpu/sh2/setup-sh7619.c:58:8: note: in expansion of macro 'DECLARE_INTC_DESC' 58 \| static DECLARE_INTC_DESC(intc_desc, "sh7619", vectors, NULL, \| ^~~~~~~~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] 100 \| #define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(a) \| ^ /kisskb/src/include/linux/sh_intc.h:107:2: note: in expansion of macro '_INTC_ARRAY' 107 \| _INTC_ARRAY(sense_regs), _INTC_ARRAY(ack_regs), \ \| ^~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:124:8: note: in expansion of macro 'INTC_HW_DESC' 124 \| .hw = INTC_HW_DESC(vectors, groups, mask_regs, \ \| ^~~~~~~~~~~~ /kisskb/src/arch/sh/kernel/cpu/sh2/setup-sh7619.c:58:8: note: in expansion of macro 'DECLARE_INTC_DESC' 58 \| static DECLARE_INTC_DESC(intc_desc, "sh7619", vectors, NULL, \| ^~~~~~~~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:100:63: warning: division 'sizeof (void ) / sizeof (void)' does not compute the number of array elements [-Wsizeof-pointer-div] 100 \| #define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(a) \| ^ /kisskb/src/include/linux/sh_intc.h:107:27: note: in expansion of macro '_INTC_ARRAY' 107 \| _INTC_ARRAY(sense_regs), _INTC_ARRAY(ack_regs), \ \| ^~~~~~~~~~~ /kisskb/src/include/linux/sh_intc.h:124:8: note: in expansion of macro 'INTC_HW_DESC' 124 \| .hw = INTC_HW_DESC(vectors, groups, mask_regs, \ \| ^~~~~~~~~~~~ /kisskb/src/arch/sh/kernel/cpu/sh2/setup-sh7619.c:58:8: note: in expansion of macro 'DECLARE_INTC_DESC' 58 \| static DECLARE_INTC_DESC(intc_desc, "sh7619", vectors, NULL, \| ^~~~~~~~~~~~~~~~~ /kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_remap_port': /kisskb/src/drivers/tty/serial/sh-sci.c:2666:19: warning: unused variable 'sport' [-Wunused-variable] 2666 \| struct sci_port sport = to_sci_port(port); \| ^~~~~ Completed OK # rm -rf /kisskb/build/linus_se7619_defconfig_sh4-gcc10 # Build took: 0:00:19.956402

© Michael Ellerman 2006-2018.