From 69369a7003735d0d8ef22097e27a55a8bad9557a Mon Sep 17 00:00:00 2001 From: Josh Triplett Date: Thu, 3 Apr 2014 14:48:27 -0700 Subject: fs, kernel: permit disabling the uselib syscall uselib hasn't been used since libc5; glibc does not use it. Support turning it off. When disabled, also omit the load_elf_library implementation from binfmt_elf.c, which only uselib invokes. bloat-o-meter: add/remove: 0/4 grow/shrink: 0/1 up/down: 0/-785 (-785) function old new delta padzero 39 36 -3 uselib_flags 20 - -20 sys_uselib 168 - -168 SyS_uselib 168 - -168 load_elf_library 426 - -426 The new CONFIG_USELIB defaults to `y'. Signed-off-by: Josh Triplett Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/binfmt_elf.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'fs/binfmt_elf.c') diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 67be2951b98a..0f59799fa105 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -46,10 +46,15 @@ #endif static int load_elf_binary(struct linux_binprm *bprm); -static int load_elf_library(struct file *); static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, int, int, unsigned long); +#ifdef CONFIG_USELIB +static int load_elf_library(struct file *); +#else +#define load_elf_library NULL +#endif + /* * If we don't support core dumping, then supply a NULL so we * don't even try. @@ -1005,6 +1010,7 @@ out_free_ph: goto out; } +#ifdef CONFIG_USELIB /* This is really simpleminded and specialized - we are loading an a.out library that is given an ELF header. */ static int load_elf_library(struct file *file) @@ -1083,6 +1089,7 @@ out_free_ph: out: return error; } +#endif /* #ifdef CONFIG_USELIB */ #ifdef CONFIG_ELF_CORE /* -- cgit v1.2.3