Rich Felker 68a5a23abc fix dynamic linker mapping/clearing bss in first/only LOAD segment ... writable load segments can have size-in-memory larger than their size in the ELF file, representing bss or equivalent. the initial partial page has to be zero-filled, and additional anonymous pages have to be mapped such that accesses don't failt with SIGBUS. map_library skips redundant MAP_FIXED mapping of the initial (lowest-address) segment when processing LOAD segments since it was already mapped when reserving the virtual address range, but in doing so, inadvertently also skipped the code to fill/map bss. typical executable and library files have two or more LOAD segments, and the first one is text/rodata (non-writable) and thus has no bss, but it is syntactically valid for an ELF program/library to put its writable segment first, or to have only one segment (everything writable). the binutils bfd-based linker has been observed to create such programs in the presence of unusual sections or linker scripts. fix by moving only the mmap_fixed operation under the conditional rather than skipping the remainder of the loop body. add a check to avoid bss processing in the case where the segment is not writable; this should not happen, but if it does, the change would be a crashing regression without this check.		2018-06-26 12:22:29 -04:00
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dlstart.c	fix regression in SH/FDPIC dynamic linker	2016-02-18 04:13:05 +00:00
dynlink.c	fix dynamic linker mapping/clearing bss in first/only LOAD segment	2018-06-26 12:22:29 -04:00