| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <1433853139-28554-1-git-send-email-noamc@ezchip.com> Date: Tue, 9 Jun 2015 15:32:19 +0300 From: Noam Camus <noamc@...hip.com> To: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org> CC: <vgupta@...opsys.com>, <giladb@...hip.com>, <cmetcalf@...hip.com>, "Noam Camus" <noamc@...hip.com> Subject: [PATCH] fs: heap/bss calculation ignore special section. From: Noam Camus <noamc@...hip.com> Today bss/heap is placed above last loaded sections. However if STACK_TOP is not equal to TASK_SIZE we wish to ignore such sections mapped to this gap between STACK_TOP and TASK_SIZE. set_brk will never work for such case. So at the moment this addition is just a sanity check. An alternative (more complex): Linux would make use of LMA field in ELF, then we can set VMA below STACK_TOP and set LMA to be between STACK_TOP and TASK_SIZE to match such special memory mapping. Signed-off-by: Noam Camus <noamc@...hip.com> --- fs/binfmt_elf.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 241ef68..09f9483 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -962,6 +962,9 @@ static int load_elf_binary(struct linux_binprm *bprm) k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; + if (k >= STACK_TOP) + continue; + if (k > elf_bss) elf_bss = k; if ((elf_ppnt->p_flags & PF_X) && end_code < k) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists