In the Linux kernel, the following vulnerability has been resolved:
powerpc/kasan: Fix addr error caused by page alignment
In kasan_init_region, when k_start is not page aligned, at the begin of
for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then
va = block + k_cur - k_start
is less than block, the addr va is invalid,
because the memory address space from va to block is not alloced by
memblock_alloc, which will not be reserved by memblock_reserve later, it
will be used by other places.
As a result, memory overwriting occurs.
for example:
int __init __weak kasan_init_region(void start, size_t size)
{
[…]
/ if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) /
block = memblock_alloc(k_end - k_start, PAGE_SIZE);
[…]
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
/ at the begin of for loop
* block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400)
* va(dcd96c00) is less than block(dcd97000), va is invalid
*/
void *va = block + k_cur - k_start;
[…]
}
[…]
}
Therefore, page alignment is performed on k_start before
memblock_alloc() to ensure the validity of the VA address.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/powerpc/mm/kasan/init_32.c"
],
"versions": [
{
"version": "663c0c9496a6",
"lessThan": "230e89b5ad0a",
"status": "affected",
"versionType": "git"
},
{
"version": "663c0c9496a6",
"lessThan": "2738e0aa2fb2",
"status": "affected",
"versionType": "git"
},
{
"version": "663c0c9496a6",
"lessThan": "0c09912dd838",
"status": "affected",
"versionType": "git"
},
{
"version": "663c0c9496a6",
"lessThan": "0516c06b19dc",
"status": "affected",
"versionType": "git"
},
{
"version": "663c0c9496a6",
"lessThan": "70ef2ba1f428",
"status": "affected",
"versionType": "git"
},
{
"version": "663c0c9496a6",
"lessThan": "4a7aee96200a",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/powerpc/mm/kasan/init_32.c"
],
"versions": [
{
"version": "5.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.4",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.210",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.149",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.79",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.18",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.6",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe
git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058
git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882
git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6
git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0
git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25
lists.debian.org/debian-lts-announce/2024/06/msg00017.html