From: Ross Philipson ross.philipson@oracle.com
commit 445c1470b6ef96440e7cfc42dfc160f5004fd149 upstream.
The x86 boot documentation describes the setup_indirect structures and how they are used. Only one of the two functions in ioremap.c that needed to be modified to be aware of the introduction of setup_indirect functionality was updated. Adds comparable support to the other function where it was missing.
Fixes: b3c72fc9a78e ("x86/boot: Introduce setup_indirect") Signed-off-by: Ross Philipson ross.philipson@oracle.com Signed-off-by: Borislav Petkov bp@suse.de Reviewed-by: Daniel Kiper daniel.kiper@oracle.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1645668456-22036-3-git-send-email-ross.philipson@o... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/mm/ioremap.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-)
--- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -676,22 +676,51 @@ static bool memremap_is_setup_data(resou static bool __init early_memremap_is_setup_data(resource_size_t phys_addr, unsigned long size) { + struct setup_indirect *indirect; struct setup_data *data; u64 paddr, paddr_next;
paddr = boot_params.hdr.setup_data; while (paddr) { - unsigned int len; + unsigned int len, size;
if (phys_addr == paddr) return true;
data = early_memremap_decrypted(paddr, sizeof(*data)); + if (!data) { + pr_warn("failed to early memremap setup_data entry\n"); + return false; + } + + size = sizeof(*data);
paddr_next = data->next; len = data->len;
- early_memunmap(data, sizeof(*data)); + if ((phys_addr > paddr) && (phys_addr < (paddr + len))) { + early_memunmap(data, sizeof(*data)); + return true; + } + + if (data->type == SETUP_INDIRECT) { + size += len; + early_memunmap(data, sizeof(*data)); + data = early_memremap_decrypted(paddr, size); + if (!data) { + pr_warn("failed to early memremap indirect setup_data\n"); + return false; + } + + indirect = (struct setup_indirect *)data->data; + + if (indirect->type != SETUP_INDIRECT) { + paddr = indirect->addr; + len = indirect->len; + } + } + + early_memunmap(data, size);
if ((phys_addr > paddr) && (phys_addr < (paddr + len))) return true;