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From: Patrick C. <psc...@go...> - 2016-01-07 20:13:55
|
In coregrind/m_debuginfo/debuginfo.c, within the function
VG_(di_notify_mmap), there is a comment that describes when Valgrind tries
to look up debug symbols for an mmaped region. It says:
/* Now we have to guess if this is a text-like mapping, a data-like
mapping, neither or both. The rules are:
text if: x86-linux r and x
other-linux r and x and not w
data if: x86-linux r and w
other-linux r and w and not x
.... */
and goes on to describe a number of edge cases when that isn't the case.
Why require that .text isn't writable on amd64 architecture? Although
unusual and not produced by most compilers, there is nothing in either the
ELF standard or the architecture that prevents executable sections from
being mmaped with write permission. It's a legal mapping, and GDB can
properly find debug symbols in this situation. It's possible to
accidentally end up with a .text section mmaped with rwx permission with
use of the __attribute__((section(....))) GCC annotation, and its debug
symbols end up being silently ignored by Valgrind.
Why was this decision made?
|