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Tweak brk syscall

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This commit is contained in:
elicn
2022-05-31 23:03:42 +03:00
committed by Eli
parent 50f4027c99
commit efade022fb
1 changed files with 6 additions and 5 deletions
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qiling/os/posix/syscall/unistd.py
+6 -5
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@@ -210,13 +210,14 @@ def ql_syscall_brk(ql: Qiling, inp: int):
# otherwise, just return current brk_address
if inp:
new_brk_addr = ((inp + 0xfff) // 0x1000) * 0x1000
cur_brk_addr = ql.loader.brk_address
new_brk_addr = ql.mem.align_up(inp)
if inp > ql.loader.brk_address: # increase current brk_address if inp is greater
ql.mem.map(ql.loader.brk_address, new_brk_addr - ql.loader.brk_address, info="[brk]")
if inp > cur_brk_addr: # increase current brk_address if inp is greater
ql.mem.map(cur_brk_addr, new_brk_addr - cur_brk_addr, info="[brk]")
elif inp < ql.loader.brk_address: # shrink current bkr_address to inp if its smaller
ql.mem.unmap(new_brk_addr, ql.loader.brk_address - new_brk_addr)
elif inp < cur_brk_addr: # shrink current bkr_address to inp if its smaller
ql.mem.unmap(new_brk_addr, cur_brk_addr - new_brk_addr)
ql.loader.brk_address = new_brk_addr