search for: sa_nodefer

Note that I've set the SA_NODEFER flag for the SEGV handler in the ASan runtime only a couple of days ago. Not sure that could've affected this test though; without that flag the second SEGV would've simply crashed the program. But you can try removing the flag from compiler-rt/trunk/lib/sanitizer_common/sanitizer_posix_lib...

On Mon, Sep 8, 2014 at 7:00 PM, Samuel F Antao <sfantao at us.ibm.com> wrote: > Alexey, Alexander, > > Thanks for the suggestions. I tried removing the flag SA_NODEFER but it > didn't do any good... I have been digging into the problem with the > null_deref test today but I was unable to clearly identify the problem. I > suspect that it was either a bug with the calling convention/unwinding that > lead to the flags() pointer to get corrupted. It i...

...INFO deliver the signal with SIGINFO structs + * SA_THIRTYTWO delivers the signal in 32-bit mode, even if the task + * is running in 26-bit. + * SA_ONSTACK allows alternate signal stacks (see sigaltstack(2)). + * SA_RESTART flag to get restarting signals (which were the default long ago) + * SA_NODEFER prevents the current signal from being masked in the handler. + * SA_RESETHAND clears the handler when the signal is delivered. + * + * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single + * Unix names RESETHAND and NODEFER respectively. + */ +#define SA_NOCLDSTOP 0x00000001 +...

On Mon, 2014-09-08 at 22:00 -0400, Samuel F Antao wrote: > Alexey, Alexander, > > Thanks for the suggestions. I tried removing the flag SA_NODEFER but > it didn't do any good... I have been digging into the problem with the > null_deref test today but I was unable to clearly identify the > problem. I suspect that it was either a bug with the calling > convention/unwinding that lead to the flags() pointer to get > corrupted....

...SIGVTALRM 26 +#define SIGPROF 27 +#define SIGWINCH 28 +#define SIGINFO 29 +#define SIGUSR1 30 +#define SIGUSR2 31 + +#define SIGPOLL SIGIO +#define SIGPWR SIGINFO +#define SIGIOT SIGABRT + +#define SA_ONSTACK 0x00000001 +#define SA_RESTART 0x00000002 +#define SA_NOCLDSTOP 0x00000004 +#define SA_NODEFER 0x00000008 +#define SA_RESETHAND 0x00000010 +#define SA_NOCLDWAIT 0x00000020 +#define SA_SIGINFO 0x00000040 + +#define SA_ONESHOT SA_RESETHAND +#define SA_NOMASK SA_NODEFER + +#define MINSIGSTKSZ 4096 +#define SIGSTKSZ 16384 + +#define SIG_BLOCK 1 +#define SIG_UNBLOCK 2 +#define SIG_SETMASK 3 + +#i...

I've made two little patches to allow dovecot to be compiled on GNU/Hurd. Could you review them? Kind regards, Marco Nenciarini -- --------------------------------------------------------------------- | Marco Nenciarini | Debian/GNU Linux Developer - Plug Member | | mnencia at prato.linux.it | http://www.prato.linux.it/~mnencia |

...when children stop. + * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies. + * SA_SIGINFO deliver the signal with SIGINFO structs + * SA_ONSTACK indicates that a registered stack_t will be used. + * SA_RESTART flag to get restarting signals (which were the default long ago) + * SA_NODEFER prevents the current signal from being masked in the handler. + * SA_RESETHAND clears the handler when the signal is delivered. + * + * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single + * Unix names RESETHAND and NODEFER respectively. + */ +#define SA_NOCLDSTOP 0...

...8000 brk(0x9249000)                          = 0x9249000 mmap2(NULL, 516096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xfffffffff76f4000 sigaltstack({ss_sp=0x8155860, ss_flags=0x2000 /* SS_??? */, ss_size=578935014240055448}, NULL) = 0 rt_sigaction(SIGSEGV, {0x808dd5e, [], SA_STACK|SA_NODEFER}, NULL, 8) = 0 readlink("/proc/self/exe", "/root/xe", 256) = 8 stat64("/root/xe", {st_mode=S_IFREG|0755, st_size=1345687, ...}) = 0 _llseek(0, 0, 0xffd06fe0, SEEK_CUR)     = -1 ESPIPE (Illegal seek) _llseek(1, 0, 0xffd06fd0, SEEK_CUR)     = -1 ESPIPE (Illegal seek) _ll...

...Then we have: unsigned long v = STUB_CODE + (unsigned long) stub_segv_handler - // a function stored in this page (unsigned long) &__syscall_stub_start; // from linker script set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE); sigemptyset(&sa.sa_mask); sa.sa_flags = SA_ONSTACK | SA_NODEFER; sa.sa_handler = (void *) v; // Use this function. The stub_segv_handler function is defined with: void __attribute__ ((__section__ (".__syscall_stub"))) stub_segv_handler(int sig) {...} I don't actually quite understand the reason all these gyrations are necessary and why it can...

Hello, The binaries produced by LLVM and other compilers divide code up into various sections, e.g. the .text section. What is the recommended approach to assigning a symbol the address of a section using LLVM? Using GCC/LD, you can do this with a linker script, e.g. in a linker script you can do: _text = .; _stext = .; These symbols are then available in the corresponding C code using an

...quot;not blocked"); +} + +int main(int argc, char **argv) +{ + pid_t pid; + + pid = fork(); + if (pid == -1) { + perror("fork"); + exit(EXIT_FAILURE); + } else if (!pid) { + struct sigaction act; + + memset(&act, 0, sizeof(act)); + act.sa_handler = handler; + act.sa_flags = SA_NODEFER; + + sigaddset(&act.sa_mask, SIGUSR2); + sigaddset(&act.sa_mask, SIGTERM); + + sigaction(SIGUSR1, &act, NULL); + + pause(); + } else { + int status; + + sleep(3); + kill(pid, SIGUSR1); + waitpid(pid, &status, 0); + } + + return 0; +} -- 1.7.5.4

...due to historical reasons. Use the + * SA_RESTART flag to get restarting signals (which were the default long ago) + * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop. + * SA_RESETHAND clears the handler when the signal is delivered. + * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies. + * SA_NODEFER prevents the current signal from being masked in the handler. + * + * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single + * Unix names RESETHAND and NODEFER respectively. + */ +#define SA_NOCLDSTOP 0x00000001u +#define SA_NOCLDWAIT 0x00000002u +#define SA_SIGINFO 0x00000004u +#...

Patch registers SIGTSTP hook where it sends reset terminal color control sequence. Maros Zatko (1): fish: reset the console on ^Z RHBZ#1213844 fish/fish.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) -- 2.5.0

Hi all, I have been experiencing the failure of the address sanitizer regression tests for a PPC64 target (Power7 machine). My understanding is that most of the failures are related with the fact the stack is not being dumped. I tried to understand what might be wrong and started by looking into the null_deref.cc test as it hangs during the test run. I observe that after the detection of the

.../../include/signal.h:14, from usr/klibc/../include/sys/select.h:11, from usr/klibc/../include/unistd.h:12, from usr/klibc/../include/stdio.h:11, from usr/klibc/vsnprintf.c:13: linux/include/asm-generic/signal.h:72:1: warning: "SA_NODEFER" redefined In file included from usr/klibc/../include/signal.h:14, from usr/klibc/../include/sys/select.h:11, from usr/klibc/../include/unistd.h:12, from usr/klibc/../include/stdio.h:11, from usr/klibc/vsnprintf.c:13: usr/incl...

I have updated the klibc patchset based on feedback received. In particular, the patchset has been reorganized so as not to break git-bisect. Additionally, this updates the patch base to 2.6.17-git12 (d38b69689c349f35502b92e20dafb30c62d49d63) and klibc 1.4.8; the main difference on the klibc side is removal of obsolete code. This is also available as a git tree at: