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io_uring/rsrc: raise registered buffer 1GB limit

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There's no real reason to have a limit, as the memory is accounted by
the lockmem limits anyway, if any exist. io_pin_pages() will still
restrict the maximum allowed limit per buffer, which is INT_MAX
number of pages. Cap it a bit lower than that, at 1TB for a 64-bit
system. Surely that should be enough for everyone. For now.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2026-05-04 05:42:51 -06:00
parent ca76b56a2a
commit b4e41050b2
1 changed files with 7 additions and 2 deletions
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9
io_uring/rsrc.c
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@@ -133,9 +133,14 @@ int io_validate_user_buf_range(u64 uaddr, u64 ulen)
unsigned long tmp, base = (unsigned long)uaddr;
unsigned long acct_len = (unsigned long)PAGE_ALIGN(ulen);
/* arbitrary limit, but we need something */
if (ulen > SZ_1G || !ulen)
if (!ulen)
return -EFAULT;
/* 32-bit sanity checking */
if (ulen > ULONG_MAX || uaddr > ULONG_MAX)
return -EFAULT;
/* cap to 1TB for 64-bit */
if (ulen > SZ_1T)
return -EINVAL;
if (check_add_overflow(base, acct_len, &tmp))
return -EOVERFLOW;
return 0;