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Kernel: When validating a string read, validate the pointer first.

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Calling strlen() on an invalid pointer is just gonna crash the process.
This commit is contained in:
Andreas Kling 2019-02-08 00:10:01 +01:00
parent 887b4a7a1a
commit f4bce03716
2 changed files with 8 additions and 1 deletions
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7
Kernel/Process.cpp
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@ -1643,6 +1643,13 @@ bool Process::validate_read_from_kernel(LinearAddress laddr) const
return validate_read(laddr.as_ptr(), 1);
}
bool Process::validate_read_str(const char* str)
{
if (!validate_read(str, 1))
return false;
return validate_read(str, strlen(str) + 1);
}
bool Process::validate_read(const void* address, size_t size) const
{
if (is_ring0()) {