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Implement max total allocation size for frida asan

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This commit is contained in:
s1341 2021-12-26 10:44:25 +02:00
parent 6b5181250c
commit 11ae49b7cd
2 changed files with 20 additions and 1 deletions
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9
libafl_frida/src/alloc.rs
View File

@ -28,6 +28,7 @@ pub struct Allocator {
shadow_pages: RangeSet<usize>,
allocation_queue: HashMap<usize, Vec<AllocationMetadata>>,
largest_allocation: usize,
total_allocation_size: usize,
base_mapping_addr: usize,
current_mapping_addr: usize,
}
@ -70,7 +71,7 @@ impl Allocator {
let mut shadow_bit = 0;
#[cfg(all(target_arch = "aarch64", target_os = "android"))]
for try_shadow_bit in &[46usize, 36usize] {
for try_shadow_bit in &[44usize, 36usize] {
let addr: usize = 1 << try_shadow_bit;
if unsafe {
mmap(
@ -147,6 +148,7 @@ impl Allocator {
shadow_pages: RangeSet::new(),
allocation_queue: HashMap::new(),
largest_allocation: 0,
total_allocation_size: 0,
base_mapping_addr: addr + addr + addr,
current_mapping_addr: addr + addr + addr,
}
@ -205,6 +207,11 @@ impl Allocator {
}
let rounded_up_size = self.round_up_to_page(size) + 2 * self.page_size;
if self.total_allocation_size + rounded_up_size > self.options.asan_max_total_allocation() {
return std::ptr::null_mut();
}
self.total_allocation_size += rounded_up_size;
let metadata = if let Some(mut metadata) = self.find_smallest_fit(rounded_up_size) {
//println!("reusing allocation at {:x}, (actual mapping starts at {:x}) size {:x}", metadata.address, metadata.address - self.page_size, size);
metadata.is_malloc_zero = is_malloc_zero;

12
libafl_frida/src/lib.rs
View File

@ -37,6 +37,7 @@ pub struct FridaOptions {
enable_asan_continue_after_error: bool,
enable_asan_allocation_backtraces: bool,
asan_max_allocation: usize,
asan_max_total_allocation: usize,
asan_max_allocation_panics: bool,
enable_coverage: bool,
enable_drcov: bool,
@ -79,6 +80,9 @@ impl FridaOptions {
"asan-max-allocation" => {
options.asan_max_allocation = value.parse().unwrap();
}
"asan-max-total-allocation" => {
options.asan_max_total_allocation = value.parse().unwrap();
}
"asan-max-allocation-panics" => {
options.asan_max_allocation_panics = value.parse().unwrap();
}
@ -208,6 +212,13 @@ impl FridaOptions {
self.asan_max_allocation
}
/// The maximum total allocation size that the ASAN allocator should allocate
#[must_use]
#[inline]
pub fn asan_max_total_allocation(&self) -> usize {
self.asan_max_total_allocation
}
/// Should we panic if the max ASAN allocation size is exceeded
#[must_use]
#[inline]
@ -252,6 +263,7 @@ impl Default for FridaOptions {
enable_asan_continue_after_error: false,
enable_asan_allocation_backtraces: true,
asan_max_allocation: 1 << 30,
asan_max_total_allocation: 1 << 32,
asan_max_allocation_panics: false,
enable_coverage: true,
enable_drcov: false,