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hurd: Fix pwritev*

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This follows c45d78aac ('posix: Fix generic p{read,write}v buffer allocation
(BZ#22457)'), which made pwritev to use __mmap instead of __posix_memalign,
but didn't pass PROT_READ to it, while the pwrite() call does need to
read the data we have just copied over.

	* sysdeps/posix/pwritev_common.c: Add PROT_READ to __mmap prot.
This commit is contained in:
Samuel Thibault 2018-01-07 13:31:36 +01:00
parent 8e13c51bb5
commit 200fc24b9d
2 changed files with 2 additions and 1 deletions
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1
ChangeLog
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@ -36,6 +36,7 @@
(__glob64): Define GLIBC_2_27 versioned symbol instead of glob64.
* sysdeps/gnu/glob-lstat-compat.c: New file.
* sysdeps/gnu/glob64-lstat-compat.c: New file.
* sysdeps/posix/pwritev_common.c: Add PROT_READ to __mmap prot.
2018-01-05 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>

2
sysdeps/posix/pwritev_common.c
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@ -55,7 +55,7 @@ PWRITEV (int fd, const struct iovec *vector, int count, OFF_T offset)
but 1. it is system specific (not meant in generic implementation), and
2. it would make the implementation more complex, and 3. it will require
another syscall (fcntl). */
void *buffer = __mmap (NULL, bytes, PROT_WRITE,
void *buffer = __mmap (NULL, bytes, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (__glibc_unlikely (buffer == MAP_FAILED))
return -1;