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Fix userland ELF loader for zero sized BSS. 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2244 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2006-12-14 13:32:11 +00:00
parent 0d3267a728
commit 768a4a36a4
1 changed files with 6 additions and 3 deletions
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9
linux-user/elfload.c
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@ -553,10 +553,13 @@ static void set_brk(unsigned long start, unsigned long end)
/* We need to explicitly zero any fractional pages after the data
section (i.e. bss). This would contain the junk from the file that
should not be in memory. */
static void padzero(unsigned long elf_bss)
static void padzero(unsigned long elf_bss, unsigned long last_bss)
{
unsigned long nbyte;
if (elf_bss >= last_bss)
return;
/* XXX: this is really a hack : if the real host page size is
smaller than the target page size, some pages after the end
of the file may not be mapped. A better fix would be to
@ -798,7 +801,7 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
* that there are zeromapped pages up to and including the last
* bss page.
*/
padzero(elf_bss);
padzero(elf_bss, last_bss);
elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */
/* Map the last of the bss segment */
@ -1227,7 +1230,7 @@ int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
sections */
set_brk(elf_bss, elf_brk);
padzero(elf_bss);
padzero(elf_bss, elf_brk);
#if 0
printf("(start_brk) %x\n" , info->start_brk);