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The old implementation of png_have_msa() caused a bus error, if a word in /proc/cpuinfo was longer than 10 characters. In the original implementation, `word[10]` was too short, and `word[i++] = ch` caused a stack smash if the characters between spaces were more than 10. And also, fclose(f) should be called before leaving. For example on loongson ls3a4000 cpu platform: $ cat /proc/cpuinfo system type : Generic Loongson64 System machine : loongson,loongson64g-4core-ls7a processor : 0 cpu model : ICT Loongson-3 V0.1 FPU V0.1 BogoMIPS : 3594.02 wait instruction : yes microsecond timers : yes tlb_entries : 2112 extra interrupt vector : no hardware watchpoint : no isa : mips1 mips2 mips3 mips4 mips5 mips32r1 mips32r2 mips64r1 mips64r2 ASEs implemented : vz msa loongson-mmi loongson-cam loongson-ext loongson-ext2 shadow register sets : 1 kscratch registers : 6 package : 0 core : 0 VCED exceptions : not available VCEI exceptions : not available processor : 1 cpu model : ICT Loongson-3 V0.1 FPU V0.1 BogoMIPS : 3611.26 wait instruction : yes microsecond timers : yes tlb_entries : 2112 extra interrupt vector : no hardware watchpoint : no isa : mips1 mips2 mips3 mips4 mips5 mips32r1 mips32r2 mips64r1 mips64r2 ASEs implemented : vz msa loongson-mmi loongson-cam loongson-ext loongson-ext2 shadow register sets : 1 kscratch registers : 6 package : 0 core : 1 VCED exceptions : not available VCEI exceptions : not available Co-authored-by: Cosmin Truta <ctruta@gmail.com> Signed-off-by: Sui Jingfeng <15330273260@189.cn> Signed-off-by: Cosmin Truta <ctruta@gmail.com>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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/* contrib/mips-msa/linux.c
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*
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* Copyright (c) 2020-2023 Cosmin Truta
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* Copyright (c) 2016 Glenn Randers-Pehrson
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* Written by Mandar Sahastrabuddhe, 2016.
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* Updated by Sui Jingfeng, 2021.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* On Linux, png_have_msa is implemented by reading the pseudo-file
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* "/proc/self/auxv".
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*
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* See contrib/mips-msa/README before reporting bugs.
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*
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* STATUS: SUPPORTED
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* BUG REPORTS: png-mng-implement@sourceforge.net
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*/
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#include <elf.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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static int
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png_have_msa(png_structp png_ptr)
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{
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Elf64_auxv_t aux;
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int fd;
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int has_msa = 0;
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fd = open("/proc/self/auxv", O_RDONLY);
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if (fd >= 0)
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{
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while (read(fd, &aux, sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t))
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{
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if (aux.a_type == AT_HWCAP)
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{
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uint64_t hwcap = aux.a_un.a_val;
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has_msa = (hwcap >> 1) & 1;
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break;
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}
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}
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close(fd);
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}
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#ifdef PNG_WARNINGS_SUPPORTED
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else
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png_warning(png_ptr, "/proc/self/auxv open failed");
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#endif
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return has_msa;
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}
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