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d2dc5467c6
This patch filters out the internal NPTL signals (SIGCANCEL/SIGTIMER and
SIGSETXID) from signal functions. GLIBC on Linux requires both signals to
proper implement pthread cancellation, posix timers, and set*id posix
thread synchronization.
And not filtering out the internal signal is troublesome:
- A conformant program on a architecture that does not filter out the
signals might inadvertently disable pthread asynchronous cancellation,
set*id synchronization or posix timers.
- It might also to security issues if SIGSETXID is masked and set*id
functions are called (some threads might have effective user or group
id different from the rest).
The changes are basically:
- Change __is_internal_signal to bool and used on all signal function
that has a signal number as input. Also for signal function which accepts
signals sets (sigset_t) it assumes that canonical function were used to
add/remove signals which lead to some input simplification.
- Fix tst-sigset.c to avoid check for SIGCANCEL/SIGTIMER and SIGSETXID.
It is rewritten to check each signal indidually and to check realtime
signals using canonical macros.
- Add generic __clear_internal_signals and __is_internal_signal
version since both symbols are used on generic implementations.
- Remove superflous sysdeps/nptl/sigfillset.c.
- Remove superflous SIGTIMER handling on Linux __is_internal_signal
since it is the same of SIGCANCEL.
- Remove dangling define and obvious comment on nptl/sigaction.c.
Checked on x86_64-linux-gnu.
[BZ #22391]
* nptl/sigaction.c (__sigaction): Use __is_internal_signal to
check for internal nptl signals.
* nptl/sigaction.c (__sigaction): Likewise.
* signal/sigaddset.c (sigaddset): Likewise.
* signal/sigdelset.c (sigdelset): Likewise.
* sysdeps/posix/signal.c (__bsd_signal): Likewise.
* sysdeps/posix/sigset.c (sigset): Call and check sigaddset return
value.
* signal/sigfillset.c (sigfillset): User __clear_internal_signals
to filter out internal nptl signals.
* signal/tst-sigset.c (do_test): Check ech signal indidually and
also check realtime signals using standard macros.
* sysdeps/generic/internal-signals.h (__clear_internal_signals,
__is_internal_signal, __libc_signal_block_all,
__libc_signal_block_app, __libc_signal_restore_set): New functions.
* sysdeps/nptl/sigfillset.c: Remove file.
* sysdeps/unix/sysv/linux/internal-signals.h (__is_internal_signal):
Change return to bool.
(__clear_internal_signals): Remove SIGTIMER clean since it is
equal to SIGCANEL on Linux.
* sysdeps/unix/sysv/linux/sigtimedwait.c (__sigtimedwait): Assume
signal set was constructed using standard functions.
Reported-by: Yury Norov <ynorov@caviumnetworks.com>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* Test sig*set functions. */
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#include <signal.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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sigset_t set;
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TEST_VERIFY (sigemptyset (&set) == 0);
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#define VERIFY(set, sig) \
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TEST_VERIFY (sigismember (&set, sig) == 0); \
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TEST_VERIFY (sigaddset (&set, sig) == 0); \
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TEST_VERIFY (sigismember (&set, sig) != 0); \
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TEST_VERIFY (sigdelset (&set, sig) == 0); \
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TEST_VERIFY (sigismember (&set, sig) == 0)
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/* ISO C99 signals. */
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VERIFY (set, SIGINT);
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VERIFY (set, SIGILL);
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VERIFY (set, SIGABRT);
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VERIFY (set, SIGFPE);
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VERIFY (set, SIGSEGV);
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VERIFY (set, SIGTERM);
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/* Historical signals specified by POSIX. */
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VERIFY (set, SIGHUP);
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VERIFY (set, SIGQUIT);
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VERIFY (set, SIGTRAP);
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VERIFY (set, SIGKILL);
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VERIFY (set, SIGBUS);
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VERIFY (set, SIGSYS);
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VERIFY (set, SIGPIPE);
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VERIFY (set, SIGALRM);
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/* New(er) POSIX signals (1003.1-2008, 1003.1-2013). */
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VERIFY (set, SIGURG);
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VERIFY (set, SIGSTOP);
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VERIFY (set, SIGTSTP);
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VERIFY (set, SIGCONT);
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VERIFY (set, SIGCHLD);
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VERIFY (set, SIGTTIN);
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VERIFY (set, SIGTTOU);
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VERIFY (set, SIGPOLL);
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VERIFY (set, SIGXCPU);
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VERIFY (set, SIGXFSZ);
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VERIFY (set, SIGVTALRM);
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VERIFY (set, SIGPROF);
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VERIFY (set, SIGUSR1);
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VERIFY (set, SIGUSR2);
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/* Nonstandard signals found in all modern POSIX systems
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(including both BSD and Linux). */
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VERIFY (set, SIGWINCH);
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/* Arch-specific signals. */
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#ifdef SIGEMT
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VERIFY (set, SIGEMT);
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#endif
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#ifdef SIGLOST
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VERIFY (set, SIGLOST);
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#endif
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#ifdef SIGINFO
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VERIFY (set, SIGINFO);
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#endif
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#ifdef SIGSTKFLT
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VERIFY (set, SIGSTKFLT);
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#endif
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#ifdef SIGPWR
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VERIFY (set, SIGPWR);
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#endif
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/* Read-time signals (POSIX.1b real-time extensions). If they are
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supported SIGRTMAX value is greater than SIGRTMIN. */
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for (int rtsig = SIGRTMIN; rtsig <= SIGRTMAX; rtsig++)
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{
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VERIFY (set, rtsig);
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}
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return 0;
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}
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#include <support/test-driver.c>
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