Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ab5a91a8364c3d6fc617abc47cc81d162c01d90a Commit: ab5a91a8364c3d6fc617abc47cc81d162c01d90a Parent: d313f948309ab22797316e789a7ff8fa358176b6 Author: Eric Paris <[EMAIL PROTECTED]> AuthorDate: Mon Nov 26 18:47:46 2007 -0500 Committer: James Morris <[EMAIL PROTECTED]> CommitDate: Thu Dec 6 00:24:30 2007 +1100
Security: allow capable check to permit mmap or low vm space On a kernel with CONFIG_SECURITY but without an LSM which implements security_file_mmap it is impossible for an application to mmap addresses lower than mmap_min_addr. Based on a suggestion from a developer in the openwall community this patch adds a check for CAP_SYS_RAWIO. It is assumed that any process with this capability can harm the system a lot more easily than writing some stuff on the zero page and then trying to get the kernel to trip over itself. It also means that programs like X on i686 which use vm86 emulation can work even with mmap_min_addr set. Signed-off-by: Eric Paris <[EMAIL PROTECTED]> Signed-off-by: James Morris <[EMAIL PROTECTED]> --- security/dummy.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/security/dummy.c b/security/dummy.c index 6d895ad..3ccfbbe 100644 --- a/security/dummy.c +++ b/security/dummy.c @@ -426,7 +426,7 @@ static int dummy_file_mmap (struct file *file, unsigned long reqprot, unsigned long addr, unsigned long addr_only) { - if (addr < mmap_min_addr) + if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO)) return -EACCES; return 0; } - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html