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675eb72c28
These signals are used by glibc to broadcast setuid/setgid to all threads and to send pthread cancellations. Unlike other signals, the Go runtime does not intercept these because they must invoke the libc handlers (see issues #3871 and #6997). However, because 1) these signals may be issued asynchronously by a thread running C code to another thread running Go code and 2) glibc does not set SA_ONSTACK for its handlers, glibc's signal handler may be run on a Go stack. Signal frames range from 1.5K on amd64 to many kilobytes on ppc64, so this may overflow the Go stack and corrupt heap (or other stack) data. Fix this by ensuring that these signal handlers have the SA_ONSTACK flag (but not otherwise taking over the handler). This has been a problem since Go 1.1, but it's likely that people haven't encountered it because it only affects setuid/setgid and pthread_cancel. Fixes #9600. Change-Id: I6cf5f5c2d3aa48998d632f61f1ddc2778dcfd300 Reviewed-on: https://go-review.googlesource.com/1887 Reviewed-by: Ian Lance Taylor <iant@golang.org>
79 lines
3.2 KiB
Go
79 lines
3.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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type sigTabT struct {
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flags int32
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name string
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}
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var sigtable = [...]sigTabT{
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/* 0 */ {0, "SIGNONE: no trap"},
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/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
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/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
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/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
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/* 4 */ {_SigThrow, "SIGILL: illegal instruction"},
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/* 5 */ {_SigThrow, "SIGTRAP: trace trap"},
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/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
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/* 7 */ {_SigPanic, "SIGBUS: bus error"},
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/* 8 */ {_SigPanic, "SIGFPE: floating-point exception"},
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/* 9 */ {0, "SIGKILL: kill"},
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/* 10 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},
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/* 11 */ {_SigPanic, "SIGSEGV: segmentation violation"},
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/* 12 */ {_SigNotify, "SIGUSR2: user-defined signal 2"},
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/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
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/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
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/* 15 */ {_SigNotify + _SigKill, "SIGTERM: termination"},
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/* 16 */ {_SigThrow, "SIGSTKFLT: stack fault"},
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/* 17 */ {_SigNotify, "SIGCHLD: child status has changed"},
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/* 18 */ {0, "SIGCONT: continue"},
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/* 19 */ {0, "SIGSTOP: stop, unblockable"},
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/* 20 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
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/* 21 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
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/* 22 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
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/* 23 */ {_SigNotify, "SIGURG: urgent condition on socket"},
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/* 24 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
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/* 25 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
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/* 26 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
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/* 27 */ {_SigNotify, "SIGPROF: profiling alarm clock"},
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/* 28 */ {_SigNotify, "SIGWINCH: window size change"},
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/* 29 */ {_SigNotify, "SIGIO: i/o now possible"},
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/* 30 */ {_SigNotify, "SIGPWR: power failure restart"},
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/* 31 */ {_SigNotify, "SIGSYS: bad system call"},
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/* 32 */ {_SigSetStack, "signal 32"}, /* SIGCANCEL; see issue 6997 */
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/* 33 */ {_SigSetStack, "signal 33"}, /* SIGSETXID; see issue 3871, 9400 */
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/* 34 */ {_SigNotify, "signal 34"},
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/* 35 */ {_SigNotify, "signal 35"},
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/* 36 */ {_SigNotify, "signal 36"},
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/* 37 */ {_SigNotify, "signal 37"},
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/* 38 */ {_SigNotify, "signal 38"},
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/* 39 */ {_SigNotify, "signal 39"},
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/* 40 */ {_SigNotify, "signal 40"},
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/* 41 */ {_SigNotify, "signal 41"},
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/* 42 */ {_SigNotify, "signal 42"},
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/* 43 */ {_SigNotify, "signal 43"},
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/* 44 */ {_SigNotify, "signal 44"},
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/* 45 */ {_SigNotify, "signal 45"},
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/* 46 */ {_SigNotify, "signal 46"},
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/* 47 */ {_SigNotify, "signal 47"},
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/* 48 */ {_SigNotify, "signal 48"},
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/* 49 */ {_SigNotify, "signal 49"},
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/* 50 */ {_SigNotify, "signal 50"},
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/* 51 */ {_SigNotify, "signal 51"},
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/* 52 */ {_SigNotify, "signal 52"},
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/* 53 */ {_SigNotify, "signal 53"},
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/* 54 */ {_SigNotify, "signal 54"},
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/* 55 */ {_SigNotify, "signal 55"},
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/* 56 */ {_SigNotify, "signal 56"},
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/* 57 */ {_SigNotify, "signal 57"},
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/* 58 */ {_SigNotify, "signal 58"},
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/* 59 */ {_SigNotify, "signal 59"},
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/* 60 */ {_SigNotify, "signal 60"},
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/* 61 */ {_SigNotify, "signal 61"},
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/* 62 */ {_SigNotify, "signal 62"},
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/* 63 */ {_SigNotify, "signal 63"},
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/* 64 */ {_SigNotify, "signal 64"},
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}
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