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* Fix regression in DMI sysfs code for handling "End of Table" entry

Browse source 
and a type bug that could lead to integer overflow - Ivan Khoronzhuk
 
  * Fix boundary checking in efi_high_alloc() which can lead to memory
    corruption in the EFI boot stubs - Yinghai Lu
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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

Pull EFI fixes from Matt Fleming:

" - Fix regression in DMI sysfs code for handling "End of Table" entry
    and a type bug that could lead to integer overflow. (Ivan Khoronzhuk)

  - Fix boundary checking in efi_high_alloc() which can lead to memory
    corruption in the EFI boot stubs. (Yinghai Lu)"

Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2015-03-02 14:18:57 +01:00
commit be482d624c
2 changed files with 13 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

17
drivers/firmware/dmi_scan.c
View file

@ -78,7 +78,7 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
* We have to be cautious here. We have seen BIOSes with DMI pointers
* pointing to completely the wrong place for example
*/
static void dmi_table(u8 *buf, int len, int num,
static void dmi_table(u8 *buf, u32 len, int num,
void (*decode)(const struct dmi_header *, void *),
void *private_data)
{
@ -92,12 +92,6 @@ static void dmi_table(u8 *buf, int len, int num,
while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
const struct dmi_header *dm = (const struct dmi_header *)data;
/*
* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
*/
if (dm->type == DMI_ENTRY_END_OF_TABLE)
break;
/*
* We want to know the total length (formatted area and
* strings) before decoding to make sure we won't run off the
@ -108,13 +102,20 @@ static void dmi_table(u8 *buf, int len, int num,
data++;
if (data - buf < len - 1)
decode(dm, private_data);
/*
* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
*/
if (dm->type == DMI_ENTRY_END_OF_TABLE)
break;
data += 2;
i++;
}
}
static phys_addr_t dmi_base;
static u16 dmi_len;
static u32 dmi_len;
static u16 dmi_num;
static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,

8
drivers/firmware/efi/libstub/efi-stub-helper.c
View file

@ -179,12 +179,12 @@ again:
start = desc->phys_addr;
end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
if ((start + size) > end || (start + size) > max)
continue;
if (end - size > max)
if (end > max)
end = max;
if ((start + size) > end)
continue;
if (round_down(end - size, align) < start)
continue;