diff options
Diffstat (limited to 'main/linux-rpi/aslr-pie.patch')
| -rw-r--r-- | main/linux-rpi/aslr-pie.patch | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/main/linux-rpi/aslr-pie.patch b/main/linux-rpi/aslr-pie.patch deleted file mode 100644 index 70771427db..0000000000 --- a/main/linux-rpi/aslr-pie.patch +++ /dev/null @@ -1,70 +0,0 @@ -From 0b277f076ead47454b4438a7d20d0807acd2af6a Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi> -Date: Tue, 1 Oct 2013 13:46:04 +0300 -Subject: [PATCH] fs/binfmt_elf: fix memory map for PIE applications -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -arch/x86/include/asm/elf.h comment says: -" -ELF_ET_DYN_BASE is the location that an ET_DYN program is loaded -if exec'ed. Typical use of this is to invoke "./ld.so someprog" -to test out a new version of the loader. We need to make sure -that it is out of the way of the program that it will "exec", -and that there is sufficient room for the brk. -" - -In case we have main application linked as PIE, this will cause -problems as the main program itself will go the memory location -that allows very little heap. - -This fixes the loader to detect PIE application by checking if -elf_interpreter is requested, and loads them to beginning of the -address space instead of the specially crafted place for elf -interpreter. - -Signed-off-by: Timo Teräs <timo.teras@iki.fi> ---- - fs/binfmt_elf.c | 17 +++++++++++------ - 1 file changed, 11 insertions(+), 6 deletions(-) - -diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c -index 78f4608..c075ace 100644 ---- a/fs/binfmt_elf.c -+++ b/fs/binfmt_elf.c -@@ -801,6 +801,10 @@ static int load_elf_binary(struct linux_binprm *bprm) - * default mmap base, as well as whatever program they - * might try to exec. This is because the brk will - * follow the loader, and is not movable. */ -+ if (elf_interpreter) -+ load_bias = 0x00400000UL; -+ else -+ load_bias = ELF_ET_DYN_BASE; - #ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE - /* Memory randomization might have been switched off - * in runtime via sysctl or explicit setting of -@@ -809,13 +813,14 @@ static int load_elf_binary(struct linux_binprm *bprm) - * load_bias value in order to establish proper - * non-randomized mappings. - */ -- if (current->flags & PF_RANDOMIZE) -- load_bias = 0; -- else -- load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); --#else -- load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); -+ if (current->flags & PF_RANDOMIZE) { -+ if (elf_interpreter) -+ load_bias += (get_random_int() & STACK_RND_MASK) << PAGE_SHIFT; -+ else -+ load_bias = 0; -+ } - #endif -+ load_bias = ELF_PAGESTART(load_bias - vaddr); - total_size = total_mapping_size(elf_phdata, - loc->elf_ex.e_phnum); - if (!total_size) { --- -2.4.0 - |