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fix: enable FFI_MMAP_EXEC_WRIT for DragonFly BSD (#930)

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Similar to PR #265 [1], we need to enable FFI_MMAP_EXEC_WRIT to use
explicit write+exec mapping on DragonFly BSD.

Without this fix, we were having segfaults with Meld [2]; it would crash
with SIGSEGV after 5 diff operations.  The crash was caused by it
attempting to execute code from non-execute memory region.  Moreover, if
we set the `machdep.pmap_nx_enable=2` tunable (i.e., strict NX mode),
Meld would crash upon the first diff operation.

Fix the `configure.ac` script to enable `FFI_MMAP_EXEC_WRIT` for
DragonFly BSD.  In addition, add it to the supported platforms table.

[1] https://github.com/libffi/libffi/pull/265
[2] https://meldmerge.org/
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Weitian LI 2025-08-02 14:27:51 +08:00 committed by GitHub
parent 6067118768
commit b7885ace59
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2 changed files with 2 additions and 1 deletions
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1
README.md
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@ -114,6 +114,7 @@ tested:
| X86 | Solaris | Oracle Solaris Studio C |
| X86 | Windows/Cygwin | GCC |
| X86 | Windows/MinGW | GCC |
| X86-64 | DragonFly BSD | GCC |
| X86-64 | FreeBSD | GCC |
| X86-64 | Linux | GCC |
| X86-64 | Linux/x32 | GCC |

2
configure.ac
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@ -230,7 +230,7 @@ case "$target" in
[Cannot use PROT_EXEC on this target, so, we revert to
alternative means])
;;
*-apple-* | *-*-freebsd* | *-*-kfreebsd* | *-*-openbsd* | *-pc-solaris* | *-linux-android*)
*-apple-* | *-*-dragonfly* | *-*-freebsd* | *-*-kfreebsd* | *-*-openbsd* | *-pc-solaris* | *-linux-android*)
AC_DEFINE(FFI_MMAP_EXEC_WRIT, 1,
[Cannot use malloc on this target, so, we revert to
alternative means])