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Allow munamp length exceed mapped size

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This commit is contained in:
elicn
2024-08-04 12:49:03 +03:00
parent a418ace3c5
commit 8c3a5dc6b8
1 changed files with 4 additions and 3 deletions
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qiling/os/posix/syscall/mman.py
+4 -3
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@@ -18,7 +18,7 @@ from qiling.os.posix.const import *
def ql_syscall_munmap(ql: Qiling, addr: int, length: int):
try:
# find addr's enclosing memory range
label = next(label for lbound, ubound, _, label, _ in ql.mem.get_mapinfo() if (lbound <= addr < ubound) and label.startswith(('[mmap]', '[mmap anonymous]')))
ubound, label = next((ubound, label) for lbound, ubound, _, label, _ in ql.mem.get_mapinfo() if (lbound <= addr < ubound) and label.startswith(('[mmap]', '[mmap anonymous]')))
except StopIteration:
# nothing to do; cannot munmap what was not originally mmapped
ql.log.debug(f'munmap: enclosing area for {addr:#x} was not mmapped')
@@ -43,9 +43,10 @@ def ql_syscall_munmap(ql: Qiling, addr: int, length: int):
fd.lseek(fd._mapped_offset)
fd.write(content)
# unmap the enclosing memory region
# unmap the enclosing memory pages.
# munmap allows the length to exceed the mapped range. in such case, unmap by original ubound
lbound = ql.mem.align(addr)
ubound = ql.mem.align_up(addr + length)
ubound = min(ql.mem.align_up(addr + length), ubound)
ql.mem.unmap(lbound, ubound - lbound)