Subject: [merged] fs-kernel-permit-disabling-the-uselib-syscall.patch removed from -mm tree To: josh@xxxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Fri, 04 Apr 2014 12:32:24 -0700 The patch titled Subject: fs, kernel: permit disabling the uselib syscall has been removed from the -mm tree. Its filename was fs-kernel-permit-disabling-the-uselib-syscall.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Josh Triplett <josh@xxxxxxxxxxxxxxxx> 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 <josh@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/binfmt_elf.c | 9 ++++++++- fs/exec.c | 2 ++ init/Kconfig | 10 ++++++++++ kernel/sys_ni.c | 1 + 4 files changed, 21 insertions(+), 1 deletion(-) diff -puN fs/binfmt_elf.c~fs-kernel-permit-disabling-the-uselib-syscall fs/binfmt_elf.c --- a/fs/binfmt_elf.c~fs-kernel-permit-disabling-the-uselib-syscall +++ a/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 /* diff -puN fs/exec.c~fs-kernel-permit-disabling-the-uselib-syscall fs/exec.c --- a/fs/exec.c~fs-kernel-permit-disabling-the-uselib-syscall +++ a/fs/exec.c @@ -97,6 +97,7 @@ static inline void put_binfmt(struct lin module_put(fmt->module); } +#ifdef CONFIG_USELIB /* * Note that a shared library must be both readable and executable due to * security reasons. @@ -156,6 +157,7 @@ exit: out: return error; } +#endif /* #ifdef CONFIG_USELIB */ #ifdef CONFIG_MMU /* diff -puN init/Kconfig~fs-kernel-permit-disabling-the-uselib-syscall init/Kconfig --- a/init/Kconfig~fs-kernel-permit-disabling-the-uselib-syscall +++ a/init/Kconfig @@ -273,6 +273,16 @@ config FHANDLE get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2) syscalls. +config USELIB + bool "uselib syscall" + default y + help + This option enables the uselib syscall, a system call used in the + dynamic linker from libc5 and earlier. glibc does not use this + system call. If you intend to run programs built on libc5 or + earlier, you may need to enable this syscall. Current systems + running glibc can safely disable this. + config AUDIT bool "Auditing support" depends on NET diff -puN kernel/sys_ni.c~fs-kernel-permit-disabling-the-uselib-syscall kernel/sys_ni.c --- a/kernel/sys_ni.c~fs-kernel-permit-disabling-the-uselib-syscall +++ a/kernel/sys_ni.c @@ -152,6 +152,7 @@ cond_syscall(sys_process_vm_readv); cond_syscall(sys_process_vm_writev); cond_syscall(compat_sys_process_vm_readv); cond_syscall(compat_sys_process_vm_writev); +cond_syscall(sys_uselib); /* arch-specific weak syscall entries */ cond_syscall(sys_pciconfig_read); _ Patches currently in -mm which might be from josh@xxxxxxxxxxxxxxxx are origin.patch include-linux-crash_dumph-add-vmcore_cleanup-prototype.patch include-linux-crash_dumph-add-vmcore_cleanup-prototype-fix.patch cris-make-etrax_arch_v10-select-tty-for-use-in-debugport.patch ia64-select-config_tty-for-use-of-tty_write_message-in-unaligned.patch ppc-make-ppc_book3s_64-select-irq_work.patch kconfig-make-allnoconfig-disable-options-behind-embedded-and-expert.patch bug-when-config_bug-simplify-warn_on_once-and-family.patch include-asm-generic-bugh-style-fix-s-while0-while-0.patch bug-when-config_bug-make-warn-call-no_printk-to-check-format-and-args.patch bug-make-bug-always-stop-the-machine.patch x86-always-define-bug-and-have_arch_bug-even-with-config_bug.patch linux-next.patch lglock-map-to-spinlock-when-config_smp.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html