From 6eb3c3d0a52dca337e327ae8868ca1f44a712e02 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 7 Mar 2019 16:29:26 -0800 Subject: [PATCH] exec: increase BINPRM_BUF_SIZE to 256 Large enterprise clients often run applications out of networked file systems where the IT mandated layout of project volumes can end up leading to paths that are longer than 128 characters. Bumping this up to the next order of two solves this problem in all but the most egregious case while still fitting into a 512b slab. [oleg@redhat.com: update comment, per Kees] Link: http://lkml.kernel.org/r/20181112160956.GA28472@redhat.com Signed-off-by: Oleg Nesterov Reported-by: Ben Woodard Reviewed-by: Andrew Morton Acked-by: Michal Hocko Acked-by: Kees Cook Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/exec.c | 2 +- include/uapi/linux/binfmts.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index bf0ace3841ad..2e0033348d8e 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1563,7 +1563,7 @@ static void bprm_fill_uid(struct linux_binprm *bprm) /* * Fill the binprm structure from the inode. - * Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes + * Check permissions, then read the first BINPRM_BUF_SIZE bytes * * This may be called multiple times for binary chains (scripts for example). */ diff --git a/include/uapi/linux/binfmts.h b/include/uapi/linux/binfmts.h index 4abad03a8853..689025d9c185 100644 --- a/include/uapi/linux/binfmts.h +++ b/include/uapi/linux/binfmts.h @@ -16,6 +16,6 @@ struct pt_regs; #define MAX_ARG_STRINGS 0x7FFFFFFF /* sizeof(linux_binprm->buf) */ -#define BINPRM_BUF_SIZE 128 +#define BINPRM_BUF_SIZE 256 #endif /* _UAPI_LINUX_BINFMTS_H */