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Kenrel: Validate inode open mode on read/write syscalls

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Bananymous
2024-12-15 20:49:12 +02:00
parent 1815a913c3
commit 46d4e32510
1 changed files with 4 additions and 0 deletions
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4
kernel/kernel/OpenFileDescriptorSet.cpp
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@@ -300,6 +300,8 @@ namespace Kernel
{ {
TRY(validate_fd(fd)); TRY(validate_fd(fd));
auto& open_file = m_open_files[fd]; auto& open_file = m_open_files[fd];
if (!(open_file->flags & O_RDONLY))
return BAN::Error::from_errno(EBADF);
if ((open_file->flags & O_NONBLOCK) && !open_file->inode()->can_read()) if ((open_file->flags & O_NONBLOCK) && !open_file->inode()->can_read())
return 0; return 0;
size_t nread = TRY(open_file->inode()->read(open_file->offset, buffer)); size_t nread = TRY(open_file->inode()->read(open_file->offset, buffer));
@@ -311,6 +313,8 @@ namespace Kernel
{ {
TRY(validate_fd(fd)); TRY(validate_fd(fd));
auto& open_file = m_open_files[fd]; auto& open_file = m_open_files[fd];
if (!(open_file->flags & O_WRONLY))
return BAN::Error::from_errno(EBADF);
if ((open_file->flags & O_NONBLOCK) && !open_file->inode()->can_write()) if ((open_file->flags & O_NONBLOCK) && !open_file->inode()->can_write())
return 0; return 0;
if (open_file->flags & O_APPEND) if (open_file->flags & O_APPEND)