Petr Gajdos
dcba818b5c
* 563.patch OBS-URL: https://build.opensuse.org/package/show/graphics/libpng16?expand=0&rev=146
99 lines
3.6 KiB
Diff
99 lines
3.6 KiB
Diff
From ceed2a3cf6af420a0782e7f6147d5965b01b772a Mon Sep 17 00:00:00 2001
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From: John Bowler <jbowler@acm.org>
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Date: Thu, 30 May 2024 07:53:42 -0700
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Subject: [PATCH] SECURITY: disable build of filter_neon.S on arm
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This fixes the bug https://github.com/pnggroup/libpng/issues/505
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"libpng does not support PAC/BTI on aarch64 targets" which arises
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because the build mechanisms (both cmake and configure) assemble
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arm/filter_neon.S even though it ends up completely empty. The empty
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file effectively poisons the so that the PAC/BTI support gets disabled.
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The fix is minimal; it simply removes arm/filter_neon.S from the list of
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sources included in the 64-bit ARM builds build. Note that this was
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already done in cmake for MSVC - it's not clear whether this change was
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a partial fix for the same issue.
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This version of the fix ONLY affects aarch64 (arm64) builds; 32-bit ARM
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systems can still invoke the assembler if required and, indeed, there
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should be no change whatsover to those builds.
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The assembler code could not be used on 64-bit systems in any case so
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in practice there is no material change to 64-bit builds either.
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TESTING: pull the changes then type "autoreconf" if using configure (not
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required for cmake).
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TESTS: cmake has not been tested because cross-builds with cmake
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currently fail to find the zlib installation from the cmake system root
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path. The following has been tested with configure cross builds:
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armv7-linux-gnueabi [no neon support]
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armv7a-linux-gnueabi [no neon support]
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armv7a-hardfloat-linux-gnueabi [neon support not enabled]
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armv7a-hardfloat-linux-gnueabi -mfpu=neon [uses intrinics]
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armv7a-hardfloat-linux-gnueabi -mfpu=neon
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-DPNG_ARM_NEON_IMPLEMENTATION=2 [uses assembler]
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aarch64-linux-gnu [uses intrinsics]
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aarch64-linux-gnu -DPNG_ARM_NEON_OPT=0 [neon support disabled]
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Signed-off-by: John Bowler <jbowler@acm.org>
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---
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CMakeLists.txt | 2 +-
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Makefile.am | 6 ++++--
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configure.ac | 10 ++++++++++
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3 files changed, 15 insertions(+), 3 deletions(-)
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diff --git a/CMakeLists.txt b/CMakeLists.txt
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index 77e5398b6a..11bbe36d2a 100644
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--- a/CMakeLists.txt
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+++ b/CMakeLists.txt
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@@ -153,7 +153,7 @@ if(TARGET_ARCH MATCHES "^(ARM|arm|aarch)")
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arm/arm_init.c
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arm/filter_neon_intrinsics.c
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arm/palette_neon_intrinsics.c)
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- if(NOT MSVC)
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+ if(NOT MSVC AND NOT TARGET_ARCH MATCHES "^(ARM64|arm64|aarch64)")
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list(APPEND libpng_arm_sources arm/filter_neon.S)
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endif()
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if(PNG_ARM_NEON STREQUAL "on")
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diff --git a/Makefile.am b/Makefile.am
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index 1f06c703a1..5cc27a4c8f 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -107,9 +107,11 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
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png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
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if PNG_ARM_NEON
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+if PNG_ARM_NEON_ASM
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+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/filter_neon.S
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+endif
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libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
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- arm/filter_neon.S arm/filter_neon_intrinsics.c \
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- arm/palette_neon_intrinsics.c
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+ arm/filter_neon_intrinsics.c arm/palette_neon_intrinsics.c
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endif
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if PNG_MIPS_MSA
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diff --git a/configure.ac b/configure.ac
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index 2c6b3333c6..e3c1536f0c 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -425,6 +425,16 @@ AM_CONDITIONAL([PNG_ARM_NEON],
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*) test "$enable_arm_neon" != '' ;;
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esac])
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+# Add the assembler implementation source file. This only works on 32-bit
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+# ARM and causes problems even if empty on 64-bit ARM.
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+AM_CONDITIONAL([PNG_ARM_NEON_ASM],
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+ [test "$enable_arm_neon" != 'no' &&
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+ case "$host_cpu" in
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+ arm64*|aarch64*) false ;;
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+ arm*) true ;;
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+ *) test "$enable_arm_neon" != '' ;;
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+ esac])
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+
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# MIPS MSA
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# ========
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