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author | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-03-09 23:40:58 +0000 |
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committer | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-03-09 23:40:58 +0000 |
commit | 9d68290acef4b19e56992477c346e814cf8e40c5 (patch) | |
tree | 1a0a01f1fe702feadf8fd20a3cf9fa97c02fd779 /libgo | |
parent | 7bb12776cc9082f80bf319b2c0d9942c7614a1e4 (diff) | |
download | gcc-9d68290acef4b19e56992477c346e814cf8e40c5.tar.gz |
PR go/65349
runtime: Don't call malloc from __go_file_line callback.
When crashing, we call runtime_printcreatedby which calls
__go_file_line which used to call the Go malloc. If we are
crashing due to a signal due to heap corruption of some sort,
the GO malloc lock might already be held, leading to a crash
within a crash. Avoid that by assuming that the libbacktrace
strings will stick around, as we already do in go-callers.c.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@221291 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgo')
-rw-r--r-- | libgo/runtime/go-caller.c | 36 |
1 files changed, 6 insertions, 30 deletions
diff --git a/libgo/runtime/go-caller.c b/libgo/runtime/go-caller.c index 7fcdf2021d3..ad151ecea8e 100644 --- a/libgo/runtime/go-caller.c +++ b/libgo/runtime/go-caller.c @@ -37,36 +37,12 @@ callback (void *data, uintptr_t pc __attribute__ ((unused)), { struct caller *c = (struct caller *) data; - if (function == NULL) - { - c->fn.str = NULL; - c->fn.len = 0; - } - else - { - byte *s; - - c->fn.len = __builtin_strlen (function); - s = runtime_malloc (c->fn.len); - __builtin_memcpy (s, function, c->fn.len); - c->fn.str = s; - } - - if (filename == NULL) - { - c->file.str = NULL; - c->file.len = 0; - } - else - { - byte *s; - - c->file.len = __builtin_strlen (filename); - s = runtime_malloc (c->file.len); - __builtin_memcpy (s, filename, c->file.len); - c->file.str = s; - } - + /* The libbacktrace library says that these strings might disappear, + but with the current implementation they won't. We can't easily + allocate memory here, so for now assume that we can save a + pointer to the strings. */ + c->fn = runtime_gostringnocopy ((const byte *) function); + c->file = runtime_gostringnocopy ((const byte *) filename); c->line = lineno; return 0; |