[PATCH 0/4] Fix getrlimit/setrlimit/prlimit on Alpha and 32-bit machines

[Aurelien Jarno <aurelien at aurel32 dot net>]

Since commit 045c13d185 ("Consolidate Linux setrlimit and getrlimit
implementation") which is in glibc 2.25, the getrlimit and setrlimit
functions are broken when used with RLIM_INFINITY on alpha. The commit
changed the syscalls behind these functions from getrlimit/setrlimit to
prlimit64. RLIM_INFINITY is not represented the same way in these
syscalls on alpha. The getrlimit/setrlimit syscalls use the same
definition than the GNU libc, that is 0x7fffffffffffffff while prlimit64
uses a standard value across all architectures which is 0xffffffffffffffff.

The commit therefore broke the getrlimit/setrlimit functions on alpha,
and is the reason why dozens of the glibc tests abort with:

  allocatestack.c:480: allocate_stack: Assertion `size != 0' failed.

This patch series fixes that in two steps, the first patch adds a
wrapper to fix the value before/after the syscall and can be backported
to stable branches. The second add a new symbol so that the
RLIM_INFINITY value can be changed to the same value as in the kernel
and other architectures.

The third patch fixes an issue with prlimit and RLIM_INFINITY on 32-bit
machines found while writing a test. The last patch add a test to detect
such issueS.

Aurelien Jarno (4):
  Alpha: Add wrappers to get/setrlimit64 to fix RLIM64_INFINITY constant
    [BZ #22648]
  Alpha: Fix the RLIM_INFINITY and RLIM64_INFINITY constants
  prlimit: Translate old_rlimit from RLIM64_INFINITY to RLIM_INFINITY
    [BZ #22678]
  Add test for getrlimit/setrlimit/prlimit with infinity value

 ChangeLog                                     |  41 +++++++
 sysdeps/unix/sysv/linux/Makefile              |   3 +-
 sysdeps/unix/sysv/linux/alpha/Versions        |   3 +
 sysdeps/unix/sysv/linux/alpha/bits/resource.h |   6 +-
 sysdeps/unix/sysv/linux/alpha/getrlimit64.c   |  56 +++++++++
 sysdeps/unix/sysv/linux/alpha/libc.abilist    |   4 +
 sysdeps/unix/sysv/linux/alpha/setrlimit64.c   |  53 +++++++++
 sysdeps/unix/sysv/linux/getrlimit64.c         |  18 +--
 sysdeps/unix/sysv/linux/prlimit.c             |  15 ++-
 sysdeps/unix/sysv/linux/setrlimit64.c         |   5 +
 sysdeps/unix/sysv/linux/tst-rlimit-infinity.c | 157 ++++++++++++++++++++++++++
 11 files changed, 342 insertions(+), 19 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/alpha/getrlimit64.c
 create mode 100644 sysdeps/unix/sysv/linux/alpha/setrlimit64.c
 create mode 100644 sysdeps/unix/sysv/linux/tst-rlimit-infinity.c

-- 
2.15.1