diff options
authorYann Sionneau <>2019-06-25 13:45:48 (GMT)
committerWaldemar Brodkorb <>2019-07-05 12:47:21 (GMT)
commit028d28e6a9654c9addfc4fe1af9b6dd9bd464680 (patch)
parent721f0983ea98376644a22df578740b6489a4e49a (diff)
Fix header installation for recent 64-only arch
Summary: Recent arch do not support Legacy. Thus they don't define ARCH_HAS_DEPRECATED_SYSCALLS But this led to per-arch headers not being installed and common-generic ones taking precedence. So it was impossible to declare arch-specific statfs.h for instance, to force 64-bit mode only. This was leading to the following situation to happen: 1/ an application compiles (say without -D_FILE_OFFSET_BITS set) it therefore uses struct statfs from libc/sysdeps/linux/common-generic/bits/statfs.h where f_type and f_bsize fields are U32: 2/ application calls "statfs" 3/ uClibc issues "statfs64" syscall (because __NR_statfs64 is defined and __NR_statfs is undefined): 4/ if Linux kernel port is not defining CONFIG_COMPAT, it calls do_statfs_native 5/ it does copy_to_user of the size of struct statfs defined in the kernel source tree: 6/ Generic struct statfs in the kernel is defined like this: f_type and f_bsize fields are long (64 bits) for 64-bit archs. 7/ memory corruption occurs because of this mismatch Solution: Allow to not define __ARCH_HAS_DEPRECATED_SYSCALLS__ *and* declare its own arch-specific statfs.h header, matching the kernel one. (for instance with f_type and f_bsize defined as long) Does this change break other archs? This change allows headers in libc/sysdeps/linux/<ARCH>/bits/ to override ones in libc/sysdeps/linux/common-generic/bits/ The only arch which does not define __ARCH_HAS_DEPRECATED_SYSCALLS__ *and* has a header in libc/sysdeps/linux/<ARCH>/bits/ which can conflict with one in libc/sysdeps/linux/common-generic/bits/ is c6x. The file that can override is ../libc/sysdeps/linux/c6x/bits/kernel_stat.h This, btw, means that, today, this file is there and is not used (during compilation, GNU Make overrides the rule): warning: overriding recipe for target `include/bits/kernel_stat.h' warning: ignoring old recipe for target `include/bits/kernel_stat.h' I was not able to compile uClibc with the only binary toolchain I found for c6x arch (gcc-4.5.1 from code sourcery: However, I can tell that c6x's kernel_stat.h only defines two structs: kernel_stat and kernel_stat64: And I can also tell that those structs are only used when using xstat conversion functions (__xstat32_conv / xstat_conv) which are only used and present in the __ARCH_HAS_DEPRECATED_SYSCALLS__ == y case. However, c6x does not define __ARCH_HAS_DEPRECATED_SYSCALLS__ So I think I can say that this change does not affect c6x nor other archs.
1 files changed, 3 insertions, 3 deletions
diff --git a/ b/
index 1754040..16ee9ee 100644
--- a/
+++ b/
@@ -144,14 +144,14 @@ $(top_builddir)include/dl-osinfo.h $(top_builddir)include/not-cancel.h:
$(do_ln) $(call rel_srcdir)libc/sysdeps/linux/common/bits/$(@F) $@
- $(do_ln) $(call rel_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)/bits/$(@F) $@
$(do_ln) $(call rel_srcdir)libc/sysdeps/linux/common-generic/bits/$(@F) $@
+ $(do_ln) $(call rel_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)/bits/$(@F) $@
ifneq ($(TARGET_SUBARCH),)
$(do_ln) $(call rel_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)/bits/$(TARGET_SUBARCH)/$(@F) $@