merge revision(s) 59893,59922: [Backport #13895]
fix the case High Sierra's mincore(2) may return -128 [Bug #13895] Fix typos [ci skip] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62811 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -1,3 +1,7 @@
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Sun Mar 18 23:26:20 2018 NARUSE, Yui <naruse@ruby-lang.org>
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fix the case High Sierra's mincore(2) may return -128 [Bug #13895]
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Sun Mar 18 23:23:48 2018 Koichi Sasada <ko1@atdot.net>
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skip unless PLATFORM is darwin.
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@ -1,6 +1,6 @@
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#define RUBY_VERSION "2.3.7"
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#define RUBY_RELEASE_DATE "2018-03-18"
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#define RUBY_PATCHLEVEL 412
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#define RUBY_PATCHLEVEL 413
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#define RUBY_RELEASE_YEAR 2018
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#define RUBY_RELEASE_MONTH 3
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31
vm_dump.c
31
vm_dump.c
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@ -463,7 +463,7 @@ darwin_sigtramp:
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ucontext_t *uctx;
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char vec[1];
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int r;
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/* get _sigtramp's ucontext_t and set values to cursor
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/* get previous frame information from %rbx at _sigtramp and set values to cursor
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* http://www.opensource.apple.com/source/Libc/Libc-825.25/i386/sys/_sigtramp.s
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* http://www.opensource.apple.com/source/libunwind/libunwind-35.1/src/unw_getcontext.s
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*/
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@ -486,8 +486,35 @@ darwin_sigtramp:
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unw_set_reg(&cursor, UNW_X86_64_R14, uctx->uc_mcontext->__ss.__r14);
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unw_set_reg(&cursor, UNW_X86_64_R15, uctx->uc_mcontext->__ss.__r15);
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ip = uctx->uc_mcontext->__ss.__rip;
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/* There're 4 cases for SEGV:
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* (1) called invalid address
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* (2) read or write invalid address
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* (3) received signal
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*
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* Detail:
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* (1) called invalid address
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* In this case, saved ip is invalid address.
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* It needs to just save the address for the information,
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* skip the frame, and restore the frame calling the
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* invalid address from %rsp.
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* The problem is how to check whether the ip is valid or not.
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* This code uses mincore(2) and assume the address's page is
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* incore/referenced or not reflects the problem.
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* Note that High Sierra's mincore(2) may return -128.
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* (2) read or write invalid address
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* saved ip is valid. just restart backtracing.
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* (3) received signal in user space
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* Same as (2).
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* (4) received signal in kernel
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* In this case saved ip points just after syscall, but registers are
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* already overwritten by kernel. To fix register consistency,
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* skip libc's kernel wrapper.
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* To detect this case, just previous two bytes of ip is "\x0f\x05",
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* syscall instruction of x86_64.
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*/
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r = mincore((const void *)ip, 1, vec);
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if (r || !vec[0] || memcmp((const char *)ip-2, "\x0f\x05", 2) == 0) {
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if (r || vec[0] <= 0 || memcmp((const char *)ip-2, "\x0f\x05", 2) == 0) {
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/* if segv is caused by invalid call or signal received in syscall */
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/* the frame is invalid; skip */
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trace[n++] = (void *)ip;
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