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146 Commits

Author SHA1 Message Date
Daniel Micay
d18b05eaf4 avoid redundant checks for large realloc 2018-10-06 13:31:16 -04:00
Daniel Micay
eb7ced7781 implement in-place growth of large allocations 2018-10-06 13:24:22 -04:00
Daniel Micay
3dc49f8f73 slightly improve sized deallocation error messages 2018-10-05 01:06:12 -04:00
Daniel Micay
dcd969ae04 use a consistent style for fixed-size int types 
The stdint.h types don't cover 128-bit integers and the underscore makes
them ill suited to usage in function suffixes. Instead, use the common
naming style in the Linux kernel and elsewhere including the ChaCha8
implementation included here.
 2018-10-04 15:17:11 -04:00
Daniel Micay
642eed81c0 allow using larger guards on large allocations 2018-10-04 02:58:24 -04:00
Daniel Micay
5811bd184c avoid unnecessary preprocessor use for canary mask 2018-10-03 17:17:20 -04:00
Daniel Micay
b24569b6ca zero leading byte of canaries 2018-10-03 17:09:57 -04:00
Daniel Micay
cf449b3df4 add sized deallocation support 2018-09-19 13:05:12 -04:00
Daniel Micay
82314f4471 make get_size_info straightforward for zero size 2018-09-11 14:51:36 -04:00
Daniel Micay
7a404ddbf2 optimize size calculation for 16 byte spaced sizes 2018-09-11 14:46:44 -04:00
Daniel Micay
2d6ad18aa4 make function naming a bit more consistent 2018-09-11 14:18:13 -04:00
Daniel Micay
684291bf6a avoid overhead of init check for slab deallocation 2018-09-11 14:13:43 -04:00
Daniel Micay
ef098fea06 simplify init function 2018-09-11 14:12:27 -04:00
Daniel Micay
61684925e8 fix overly naive slab allocation alignment support 2018-09-10 19:01:11 -04:00
Daniel Micay
9a1acce5eb optimize calloc when zero on free is disabled 2018-09-07 16:33:28 -04:00
Daniel Micay
7ae7abedea mark more unlikely code paths 2018-09-07 02:53:15 -04:00
Daniel Micay
49af83a817 wrap mutex type to enable future optimization 2018-09-07 01:13:08 -04:00
Daniel Micay
fc2473e7ee add configuration for canaries 2018-09-07 00:35:08 -04:00
Daniel Micay
96c538d90f add configuration for zero on free 2018-09-07 00:33:51 -04:00
Daniel Micay
ba3a8b0058 add slot randomization to configuration header 2018-09-07 00:25:02 -04:00
Daniel Micay
bed303a76f remove unnecessary else branch 2018-09-07 00:22:51 -04:00
Daniel Micay
d398384b90 add header for configuration 2018-09-07 00:17:31 -04:00
Daniel Micay
99d68238d2 implement slab allocation write-after-free check 2018-09-07 00:00:32 -04:00
Daniel Micay
684e63a878 handle pthread_atfork calling into malloc 
This results in compatibility with the malloc replacement support added
in musl 1.1.20.
 2018-09-06 19:48:00 -04:00
Daniel Micay
1be74ec40d add initial guard slabs implementation 2018-09-06 18:55:24 -04:00
Daniel Micay
cc1e79fdba abstract metadata allocation to allow guard slabs 2018-09-06 18:45:41 -04:00
Daniel Micay
d8e18e0011 aligned_alloc is now the same as BSD memalign 
The resolution to DR 460 (which is explicitly included in C17) removed
the requirement for the size to be a multiple of the alignment.
 2018-09-06 16:30:22 -04:00
Daniel Micay
0d3c2e1988 no need for a dedicated init rng 2018-09-06 16:02:25 -04:00
Daniel Micay
8624201f06 refresh canary value when allocating free slabs 2018-09-06 15:07:01 -04:00
Daniel Micay
a875951e82 fix build with musl 2018-09-06 14:35:08 -04:00
Daniel Micay
e891b40588 implement Android malloc_disable/malloc_enable API 2018-09-06 14:17:23 -04:00
Daniel Micay
3a532b17dc implement in-place shrinking for large allocations 2018-09-05 07:37:26 -04:00
Daniel Micay
645209dcbf remove unnecessary debugging code 2018-09-05 03:42:05 -04:00
Daniel Micay
9ddd53d56c implement initial slab allocation canaries 2018-09-04 09:29:35 -04:00
Daniel Micay
1a7b8079d0 reuse is_init when possible 2018-09-02 19:58:57 -04:00
Daniel Micay
7733047c7b trigger early initialization in a conservative way 2018-09-02 19:52:12 -04:00
Daniel Micay
7e088dc870 add stubs for Android extensions 2018-09-02 05:08:45 -04:00
Daniel Micay
e4648192c0 split out code for managing page spans 2018-09-02 02:03:39 -04:00
Daniel Micay
e93d039214 only use reserved memory for regions hash table 2018-09-01 10:23:06 -04:00
Daniel Micay
c3a4829d77 remove unnecessary special case from realloc 2018-09-01 02:42:33 -04:00
Daniel Micay
f441dfe2e3 align size class metadata to cacheline size 2018-08-31 23:10:26 -04:00
Daniel Micay
fad10ce943 use FIFO queue for free slabs 2018-08-31 22:55:49 -04:00
Daniel Micay
3f80895822 ignore pad argument to malloc_trim per glibc 
The pad argument is only used by the main arena for sbrk in glibc, with
every other page size gap purged with MADV_DONTNEED. It makes more sense
to simply treat it as an ignored legacy parameter rather than trying to
come up with a sensible way to use it for keeping cached free slabs.
 2018-08-30 09:36:46 -04:00
Daniel Micay
1ea997b887 add missing headers to malloc.h 2018-08-30 08:48:43 -04:00
Daniel Micay
2b0f7aa985 use a consistent name for size class integer index 2018-08-30 07:13:28 -04:00
Daniel Micay
0f5f2bf6c9 add basic initial heuristic for freeing slabs 2018-08-30 06:56:00 -04:00
Daniel Micay
456dfe4154 add support for purging and protecting empty slabs 2018-08-30 05:59:44 -04:00
Daniel Micay
bb176e09bc remove useless code in the empty_slabs path 2018-08-30 05:45:03 -04:00
Daniel Micay
29df2429c2 empty_slabs will remain a singly-linked list 2018-08-30 05:27:51 -04:00
Daniel Micay
f94068ea63 rename free_slabs to empty_slabs 2018-08-30 04:55:39 -04:00
Daniel Micay
b6d4af872f move libdivide.h to third_party/libdivide.h 2018-08-30 03:03:19 -04:00
Daniel Micay
6f9de3e667 add inline hint to get_size_info 2018-08-29 15:13:53 -04:00
Daniel Micay
e85c69a0a4 fix builds with prefix 2018-08-29 15:07:36 -04:00
Daniel Micay
becadc57a5 get rid of unused MIN_ALIGN definition 2018-08-29 14:18:45 -04:00
Daniel Micay
2684a98eab add initial malloc_object_size extensions 2018-08-29 14:18:42 -04:00
Daniel Micay
0e2f3d1015 sanity check page size at runtime 2018-08-29 11:00:18 -04:00
Daniel Micay
d779d41721 wrap more memory mapping implementation details 2018-08-29 10:57:42 -04:00
Daniel Micay
1cb28531a8 add wrapper for mremap with sanity check 2018-08-29 10:43:54 -04:00
Daniel Micay
5bc6820c24 rely on mmap rounding to page size when possible 2018-08-29 03:25:00 -04:00
Daniel Micay
58d929c0f0 split out low-level memory mapping wrappers 2018-08-29 00:53:38 -04:00
Daniel Micay
8b42e8c3d6 make sure errno is always set on failure 2018-08-28 22:49:11 -04:00
Daniel Micay
66aa98dbd9 sanity-check mmap errno on failure too 2018-08-28 22:41:18 -04:00
Daniel Micay
705b6a4f8d make non-out-of-memory mprotect errors fatal 2018-08-28 22:22:57 -04:00
Daniel Micay
19c46d16f1 check pthread_atfork return value 2018-08-28 21:31:20 -04:00
Daniel Micay
803811a6ac add support for using mremap 2018-08-28 10:44:04 -04:00
Daniel Micay
718bf82f96 add inline hints for slab_allocate and slab_free 2018-08-27 09:29:30 -04:00
Daniel Micay
33f862ec19 add inline hints for init and enforce_init 2018-08-27 09:29:27 -04:00
Daniel Micay
67b9608ccf avoid duplicated init code calculating slab size 2018-08-27 09:22:04 -04:00
Daniel Micay
c7b24f63f1 use libdivide for substantially faster division 2018-08-27 07:07:48 -04:00
Daniel Micay
63b0c39343 reorder size_class struct for better performance 2018-08-27 05:21:58 -04:00
Daniel Micay
14ca7d7c3f randomize large allocation guard size 2018-08-26 04:46:12 -04:00
Daniel Micay
a13a45a17d hold regions_lock in alloc_aligned 2018-08-26 04:37:43 -04:00
Daniel Micay
2b7c9362bb consume fewer random bytes for slab randomization 2018-08-25 18:32:44 -04:00
Daniel Micay
c5d76179a5 improve interaction of slot rand with slot mask 2018-08-25 18:04:55 -04:00
Daniel Micay
173dd6e7a5 randomize slot selection for empty slabs too 2018-08-25 18:02:13 -04:00
Daniel Micay
c335c43dd7 simplify slab out-of-memory error handling 2018-08-25 16:41:07 -04:00
Daniel Micay
7bcfa3f08b tune slab metadata allocation 2018-08-25 15:46:22 -04:00
Daniel Micay
4777ee0c85 special case division for page size slabs 2018-08-25 15:21:50 -04:00
Daniel Micay
ec78add6ab define ffzl utility function 2018-08-25 03:14:07 -04:00
Daniel Micay
f08d4d31db randomize slab slot choice 2018-08-25 03:02:39 -04:00
Daniel Micay
965c3202b4 finish implementation of zero byte size class 2018-08-25 02:48:47 -04:00
Daniel Micay
f97a0ef8b1 use a more appropriate type for masked bitmaps 2018-08-25 01:09:15 -04:00
Daniel Micay
f3c8502509 add CSPRNGs for regions and slabs 2018-08-25 00:25:33 -04:00
Daniel Micay
805bdc6087 add an extra sanity check for unallocated metadata 2018-08-24 05:22:38 -04:00
Daniel Micay
2d168b0516 check for double free slightly earlier 2018-08-24 04:51:52 -04:00
Daniel Micay
97b693d862 stop treating guard size as a constant 2018-08-24 04:07:46 -04:00
Daniel Micay
83dabbd8fa fix handling of random bases for class regions 2018-08-24 03:52:01 -04:00
Daniel Micay
0d51459dc9 add a special memory protected 0 byte size class 2018-08-24 03:24:23 -04:00
Daniel Micay
7a86b67778 add unaligned free check for small allocations 2018-08-24 02:55:53 -04:00
Daniel Micay
2aee424b7b fix inconsistent whitespace 2018-08-24 02:09:20 -04:00
Daniel Micay
a874a61099 adjust slot count for 12288 byte size class 2018-08-23 18:00:13 -04:00
Daniel Micay
127f110126 adjust slot count for 10240 byte size class 2018-08-23 17:56:17 -04:00
Daniel Micay
c59c97c65b adjust slot count for 48 byte size class 2018-08-23 17:53:10 -04:00
Daniel Micay
56e4c7e042 adjust slot count for 224 byte size class 2018-08-23 17:42:51 -04:00
Daniel Micay
4aa0fab4f4 avoid deadlocks after forking threaded processes 2018-08-23 17:22:12 -04:00
Daniel Micay
70d61b6662 initial commit 2018-08-23 15:42:41 -04:00