https://bugs.kde.org/show_bug.cgi?id=408414
Bug ID: 408414
Summary: Add support for missing for preadv2 and pwritev2
syscalls
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: ahajk...@redhat.com
Target Milestone: ---
SUMMARY
STEPS TO REPRODUCE
1. compile glibc
2. run from the build dir:
./testrun.sh --tool=valgrind misc/tst-preadvwritev2 --direct
OBSERVED RESULT
Memcheck, a memory error detector
...
--8186-- WARNING: unhandled amd64-linux syscall: 327
--8186-- You may be able to write your own handler.
--8186-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--8186-- Nevertheless we consider this a bug. Please report
--8186-- it at http://valgrind.org/support/bug_reports.html.
...
==8186== Syscall param pwritev(vector[...]) points to uninitialised byte(s)
==8186== at 0x4D01369: pwritev (pwritev64.c:30)
==8186== by 0x4019CE: do_test_with_invalid_iov
(tst-preadvwritev2-common.c:80)
==8186== by 0x401F15: do_test (tst-preadvwritev2.c:34)
==8186== by 0x403061: support_test_main (support_test_main.c:350)
==8186== by 0x401618: main (test-driver.c:168)
==8186== Address 0x1ffeffb040 is on thread 1's stack
==8186== in frame #1, created by do_test_with_invalid_iov
(tst-preadvwritev2-common.c:70)
==8186==
--8186-- WARNING: unhandled amd64-linux syscall: 327
--8186-- You may be able to write your own handler.
--8186-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--8186-- Nevertheless we consider this a bug. Please report
--8186-- it at http://valgrind.org/support/bug_reports.html.
--8186-- WARNING: unhandled amd64-linux syscall: 328
...
RESULTS with proposed patch:
....
==30023== Syscall param pwritev2(vector[...]) points to uninitialised byte(s)
==30023== at 0x4D0159D: pwritev2 (pwritev64v2.c:31)
==30023== by 0x401CEC: do_test_with_invalid_flags
(tst-preadvwritev2-common.c:119)
==30023== by 0x401CEC: do_test (tst-preadvwritev2.c:31)
==30023== by 0x403061: support_test_main (support_test_main.c:350)
==30023== by 0x401618: main (test-driver.c:168)
==30023== Address 0x1ffefff0f0 is on thread 1's stack
==30023== in frame #1, created by do_test (tst-preadvwritev2-common.c:30)
==30023==
==30023== Warning: invalid file descriptor -1 in syscall preadv2()
==30023== Warning: invalid file descriptor -1 in syscall pwritev2()
==30023== Warning: invalid file descriptor -1 in syscall preadv2()
==30023== Warning: invalid file descriptor -1 in syscall pwritev2()
==30023== Syscall param preadv2(vector[...]) points to unaddressable byte(s)
==30023== at 0x4D0143D: preadv2 (preadv64v2.c:31)
==30023== by 0x401988: do_test_with_invalid_iov
(tst-preadvwritev2-common.c:78)
==30023== by 0x401F15: do_test (tst-preadvwritev2.c:34)
==30023== by 0x403061: support_test_main (support_test_main.c:350)
==30023== by 0x401618: main (test-driver.c:168)
==30023== Address 0x1fff001000 is not stack'd, malloc'd or (recently) free'd
==30023==
==30023== Syscall param pwritev2(vector[...]) points to uninitialised byte(s)
==30023== at 0x4D0159D: pwritev2 (pwritev64v2.c:31)
==30023== by 0x4019CE: do_test_with_invalid_iov
(tst-preadvwritev2-common.c:80)
==30023== by 0x401F15: do_test (tst-preadvwritev2.c:34)
==30023== by 0x403061: support_test_main (support_test_main.c:350)
==30023== by 0x401618: main (test-driver.c:168)
==30023== Address 0x1ffeffb020 is on thread 1's stack
==30023== in frame #1, created by do_test_with_invalid_iov
(tst-preadvwritev2-common.c:70)
==30023==
==30023== Syscall param preadv2(vector[...]) points to unaddressable byte(s)
==30023== at 0x4D0143D: preadv2 (preadv64v2.c:31)
==30023== by 0x401A0F: do_test_with_invalid_iov
(tst-preadvwritev2-common.c:85)
==30023== by 0x401F15: do_test (tst-preadvwritev2.c:34)
==30023== by 0x403061: support_test_main (support_test_main.c:350)
==30023== by 0x401618: main (test-driver.c:168)
==30023== Address 0x1fff001000 is not stack'd, malloc'd or (recently) free'd
==30023==
==30023== Syscall param pwritev2(vector[...]) points to uninitialised byte(s)
==30023== at 0x4D0159D: pwritev2 (pwritev64v2.c:31)
==30023== by 0x401A54: do_test_with_invalid_iov
(tst-preadvwritev2-common.c:87)
==30023== by 0x401F15: do_test (tst-preadvwritev2.c:34)
==30023== by 0x403061: support_test_main (support_test_main.c:350)
==30023== by 0x401618: main (test-driver.c:168)
==30023== Address 0x1ffeffb020 is on thread 1's stack
==30023== in frame #1, created by do_test_with_invalid_iov
(tst-preadvwritev2-common.c:70)
==30023==
==30023==
....
Proposed patch on github:
https://github.com/sasshka/valgrind/commit/a671972cbce09a4e6d03905d4fd70c1ba84807af
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