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882d6e17bc
This patch adds a way to close a range of file descriptors on posix_spawn as a new file action. The API is similar to the one provided by Solaris 11 [1], where the file action causes the all open file descriptors greater than or equal to input on to be closed when the new process is spawned. The function posix_spawn_file_actions_addclosefrom_np is safe to be implemented by iterating over /proc/self/fd, since the Linux spawni.c helper process does not use CLONE_FILES, so its has own file descriptor table and any failure (in /proc operation) aborts the process creation and returns an error to the caller. I am aware that this file action might be redundant to the current approach of POSIX in promoting O_CLOEXEC in more interfaces. However O_CLOEXEC is still not the default and for some specific usages, the caller needs to close all possible file descriptors to avoid them leaking. Some examples are CPython (discussed in BZ#10353) and OpenJDK jspawnhelper [2] (where OpenJDK spawns a helper process to exactly closes all file descriptors). Most likely any environment which calls functions that might open file descriptor under the hood and aim to use posix_spawn might face the same requirement. Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15. [1] https://docs.oracle.com/cd/E36784_01/html/E36874/posix-spawn-file-actions-addclosefrom-np-3c.html [2] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
165 lines
3.9 KiB
Plaintext
165 lines
3.9 KiB
Plaintext
libc {
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GLIBC_2.0 {
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# functions with special/multiple interfaces
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__bsd_getpgrp; __getpgid; __setpgid;
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# functions with required interface outside normal name space
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_exit;
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# functions used in other libraries
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__sched_get_priority_max; __sched_get_priority_min;
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__sched_getparam; __sched_getscheduler; __sched_setscheduler;
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__sched_yield; __fork; __getpid; __wait;
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# functions used by libstdc++ 2.7.2
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__waitpid;
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# global variables
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__environ; _environ;
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# variables in normal name space
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environ; optarg; opterr; optind; optopt;
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re_max_failures; re_syntax_options;
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# a*
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alarm;
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# c*
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confstr;
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# e*
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execl; execle; execlp; execv; execve; execvp; fexecve;
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# f*
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fnmatch; fork; fpathconf; freeaddrinfo;
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# g*
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getaddrinfo; getdtablesize; getegid; geteuid; getgid; getopt; getopt_long;
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getopt_long_only; getpgid; getpgrp; getpid; getppid; getsid; getuid; glob;
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glob_pattern_p; globfree; group_member;
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# n*
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nanosleep;
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# p*
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pathconf; pause; pselect;
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# r*
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re_comp; re_compile_fastmap; re_compile_pattern; re_exec; re_match;
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re_match_2; re_search; re_search_2; re_set_registers; re_set_syntax;
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regcomp; regerror; regexec; regfree;
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# s*
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sched_get_priority_max; sched_get_priority_min; sched_getparam;
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sched_getscheduler; sched_rr_get_interval; sched_setparam;
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sched_setscheduler; sched_yield; setegid; seteuid; setgid;
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setpgid; setpgrp; setsid; setuid; sleep; sysconf;
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# t*
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times;
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# u*
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uname;
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# v*
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vfork;
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# w*
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wait; wait3; wait4; waitpid;
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}
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GLIBC_2.1 {
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# functions used in other libraries
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__pread64; __pwrite64;
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# g*
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gai_strerror; getnameinfo; glob64; globfree64;
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# p*
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pread; pread64; pwrite; pwrite64;
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# w*
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waitid; wordexp; wordfree;
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}
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GLIBC_2.1 {
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# Compat symbols for the obsolete, unimplemented XSI streams extension.
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fattach; fdetach; getmsg; getpmsg; isastream; putmsg; putpmsg;
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}
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GLIBC_2.1.2 {
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# functions used in other libraries
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__vfork;
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}
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GLIBC_2.2 {
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# p*
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posix_spawn_file_actions_init; posix_spawn_file_actions_destroy;
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posix_spawn_file_actions_addclose; posix_spawn_file_actions_addopen;
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posix_spawn_file_actions_adddup2;
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posix_spawnattr_init; posix_spawnattr_destroy;
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posix_spawnattr_getsigdefault; posix_spawnattr_setsigdefault;
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posix_spawnattr_getflags; posix_spawnattr_setflags;
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posix_spawnattr_getpgroup; posix_spawnattr_setpgroup;
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posix_spawnattr_setsigmask; posix_spawnattr_getsigmask;
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posix_spawn; posix_spawnp; posix_spawnattr_getschedpolicy;
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posix_spawnattr_setschedpolicy; posix_spawnattr_getschedparam;
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posix_spawnattr_setschedparam;
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# Used in macros.
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__sysconf;
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}
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GLIBC_2.2.3 {
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# Extended Interface.
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fnmatch;
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}
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GLIBC_2.2.6 {
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# For syscall wrapper
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__nanosleep;
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}
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GLIBC_2.3.2 {
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# Note that these symbols appear in sysdeps/unix/sysv/linux/Versions
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# under GLIBC_2.0; the first instance in the script is taken as the
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# default, so linux configurations put them in GLIBC_2.0 while other
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# configuration put them in GLIBC_2.3.2.
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getresgid; getresuid; setresgid; setresuid;
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}
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GLIBC_2.3.3 {
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sched_getaffinity; sched_setaffinity;
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}
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GLIBC_2.3.4 {
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regexec;
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}
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GLIBC_2.6 {
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__sched_cpucount;
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}
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GLIBC_2.7 {
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__sched_cpualloc; __sched_cpufree;
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}
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GLIBC_2.10 {
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__posix_getopt;
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}
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GLIBC_2.11 {
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execvpe;
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}
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GLIBC_2.15 {
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posix_spawn;
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posix_spawnp;
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}
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GLIBC_2.27 {
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glob; glob64;
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}
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GLIBC_2.29 {
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posix_spawn_file_actions_addchdir_np;
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posix_spawn_file_actions_addfchdir_np;
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}
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GLIBC_2.30 {
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}
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GLIBC_2.34 {
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_Fork;
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execveat;
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posix_spawn_file_actions_addclosefrom_np;
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}
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GLIBC_PRIVATE {
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__libc_fork; __libc_pread; __libc_pwrite;
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__nanosleep_nocancel; __pause_nocancel;
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__shm_get_name;
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}
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}
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