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* [Bug libc/31612] New: arc4random fails to fallback to /dev/urandom if getrandom is not present
@ 2024-04-05 13:09 adhemerval.zanella at linaro dot org
  0 siblings, 0 replies; only message in thread
From: adhemerval.zanella at linaro dot org @ 2024-04-05 13:09 UTC (permalink / raw)
  To: glibc-bugs

https://sourceware.org/bugzilla/show_bug.cgi?id=31612

            Bug ID: 31612
           Summary: arc4random fails to fallback to /dev/urandom if
                    getrandom is not present
           Product: glibc
           Version: 2.39
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: adhemerval.zanella at linaro dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The __getrandom_nocancel used in __arc4random_buf used INLINE_SYSCALL_CALL
which returns -1/errno and the loop checks for the return value instead of
errno to fallback to /dev/urandom.

The malloc code now uses __getrandom_nocancel_nostatus, which uses
INTERNAL_SYSCALL_CALL, so there is no need to use the variant that does not set
errno (BZ#29624).

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2024-04-05 13:09 [Bug libc/31612] New: arc4random fails to fallback to /dev/urandom if getrandom is not present adhemerval.zanella at linaro dot org

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