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181519cf38
11b3a0c2c5db115412c37195#explicit zero 1131456ac632#brk 1158ebc243ea#random 115323b39f7e#undefined 116a91d9dddb#merge 11a042b5a0ba#vla formatting 119ec639de1b#pthread 1149571a0a49#read only 11149cc5ccb8#zero 112e613ccbe7#fork mmap 11e239c7dff8#memprot pthread 110b03d92b7f#xor 11de08419b82#junk 11897d4903e2#guard 11648cd68ca3#ptrhread guard 110bc4dbcbd2#stack rand 10aa9cc05d0710a8cdbb6352#explicit zero 10b28302c668#brk 109f8be7d07c#random 10cb91a7ee3a#undefined 1008279e2fdd#merge 106a18bd565d#vla formatting 102f392c2d08#pthread 108bbce1bc50#read only 10725f61db82#zero 104cd257135f#fork mmap 109220cf622b#memprot pthread 108ef71d1ffd#memprot exit 100eaef1abbd#xor 1064f1cc2148#junk 105c42a527cf#guard 105cc8c34e60#pthread guard 107f61cc8a1c#stack rand 9abdf523d269e4b9b31e6f#explicit zero 9a3a22a63d2#brk 97444dbc3cf#random 9dcd3b72ac9#undefined 9543e1df342#merge 9611e5691f7#vla formatting 98de97ce864#pthread 9a475717042#read only 97f0947cc0e#zero 9e9751d3370#fork mmap 983cd86d0d5#memprot pthread 91ebb165455#memprot exit 9488ba483cf#xor 9f9351d884b#junk 985e5bca0a5#move Signed-off-by: Tad <tad@spotco.us>
48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From 6a91d9dddb01964134e50cc73f6f158706da800a Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Sat, 19 Nov 2016 09:56:14 -0500
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Subject: [PATCH] stop implicitly marking mappings as mergeable
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Signed-off-by: anupritaisno1 <www.anuprita804@gmail.com>
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---
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libc/bionic/mmap.cpp | 19 +------------------
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1 file changed, 1 insertion(+), 18 deletions(-)
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diff --git a/libc/bionic/mmap.cpp b/libc/bionic/mmap.cpp
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index 9aad0b3156..6bf0ecfd16 100644
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--- a/libc/bionic/mmap.cpp
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+++ b/libc/bionic/mmap.cpp
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@@ -39,8 +39,6 @@ extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
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#define MMAP2_SHIFT 12 // 2**12 == 4096
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-static bool kernel_has_MADV_MERGEABLE = true;
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-
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void* mmap64(void* addr, size_t size, int prot, int flags, int fd, off64_t offset) {
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if (offset < 0 || (offset & ((1UL << MMAP2_SHIFT)-1)) != 0) {
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errno = EINVAL;
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@@ -54,22 +52,7 @@ void* mmap64(void* addr, size_t size, int prot, int flags, int fd, off64_t offse
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return MAP_FAILED;
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}
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- bool is_private_anonymous =
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- (flags & (MAP_PRIVATE | MAP_ANONYMOUS)) == (MAP_PRIVATE | MAP_ANONYMOUS);
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- bool is_stack_or_grows_down = (flags & (MAP_STACK | MAP_GROWSDOWN)) != 0;
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-
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- void* result = __mmap2(addr, size, prot, flags, fd, offset >> MMAP2_SHIFT);
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-
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- if (result != MAP_FAILED && kernel_has_MADV_MERGEABLE &&
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- is_private_anonymous && !is_stack_or_grows_down) {
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- ErrnoRestorer errno_restorer;
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- int rc = madvise(result, size, MADV_MERGEABLE);
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- if (rc == -1 && errno == EINVAL) {
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- kernel_has_MADV_MERGEABLE = false;
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- }
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- }
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-
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- return result;
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+ return __mmap2(addr, size, prot, flags, fd, offset >> MMAP2_SHIFT);
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}
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void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset) {
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