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SECURITY: disable build of filter_neon.S on arm

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This fixes the bug https://github.com/pnggroup/libpng/issues/505
"libpng does not support PAC/BTI on aarch64 targets" which arises
because the build mechanisms (both cmake and configure) assemble
arm/filter_neon.S even though it ends up completely empty.  The empty
file effectively poisons the so that the PAC/BTI support gets disabled.

The fix is minimal; it simply removes arm/filter_neon.S from the list of
sources included in the 64-bit ARM builds build.  Note that this was
already done in cmake for MSVC - it's not clear whether this change was
a partial fix for the same issue.

This version of the fix ONLY affects aarch64 (arm64) builds; 32-bit ARM
systems can still invoke the assembler if required and, indeed, there
should be no change whatsover to those builds.

The assembler code could not be used on 64-bit systems in any case so
in practice there is no material change to 64-bit builds either.

TESTING: pull the changes then type "autoreconf" if using configure (not
required for cmake).

TESTS: cmake has not been tested because cross-builds with cmake
currently fail to find the zlib installation from the cmake system root
path.  The following has been tested with configure cross builds:

armv7-linux-gnueabi [no neon support]
armv7a-linux-gnueabi [no neon support]
armv7a-hardfloat-linux-gnueabi [neon support not enabled]
armv7a-hardfloat-linux-gnueabi -mfpu=neon [uses intrinics]
armv7a-hardfloat-linux-gnueabi -mfpu=neon
        -DPNG_ARM_NEON_IMPLEMENTATION=2 [uses assembler]
aarch64-linux-gnu [uses intrinsics]
aarch64-linux-gnu -DPNG_ARM_NEON_OPT=0 [neon support disabled]

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2024-05-30 07:53:42 -07:00
parent f1848a3b56
commit ceed2a3cf6
3 changed files with 15 additions and 3 deletions
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6
Makefile.am
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@@ -107,9 +107,11 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
if PNG_ARM_NEON
if PNG_ARM_NEON_ASM
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/filter_neon.S
endif
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
arm/filter_neon.S arm/filter_neon_intrinsics.c \
arm/palette_neon_intrinsics.c
arm/filter_neon_intrinsics.c arm/palette_neon_intrinsics.c
endif
if PNG_MIPS_MSA