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iconv: Do not use mmap in iconv (the program) (bug 17703)

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On current systems, very large files are needed before
mmap becomes beneficial.  Simplify the implementation.

This exposed that inptr was not initialized correctly in
process_fd.  Handling multiple input files resulted in
EFAULT in read because a null pointer was passed.  This
could be observed previously if an input file was not
mappable and was reported as bug 17703.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer 2024-09-20 13:10:54 +02:00
parent 422ed8ede3
commit 0cb64617a6
1 changed files with 1 additions and 41 deletions
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42
iconv/iconv_prog.c
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@ -31,9 +31,6 @@
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif
#include <charmap.h>
#include <gconv_int.h>
#include "iconv_prog.h"
@ -253,10 +250,6 @@ conversions from `%s' and to `%s' are not supported"),
else
do
{
#ifdef _POSIX_MAPPED_FILES
struct stat64 st;
char *addr;
#endif
int fd, ret;
if (verbose)
@ -276,39 +269,6 @@ conversions from `%s' and to `%s' are not supported"),
}
}
#ifdef _POSIX_MAPPED_FILES
/* We have possibilities for reading the input file. First try
to mmap() it since this will provide the fastest solution. */
if (fstat64 (fd, &st) == 0
&& ((addr = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE,
fd, 0)) != MAP_FAILED))
{
/* Yes, we can use mmap(). The descriptor is not needed
anymore. */
if (close (fd) != 0)
error (EXIT_FAILURE, errno,
_("error while closing input `%s'"),
argv[remaining]);
ret = process_block (cd, addr, st.st_size, &output,
output_file);
/* We don't need the input data anymore. */
munmap ((void *) addr, st.st_size);
if (ret != 0)
{
status = EXIT_FAILURE;
if (ret < 0)
/* We cannot go on with producing output since it might
lead to problem because the last output might leave
the output stream in an undefined state. */
break;
}
}
else
#endif /* _POSIX_MAPPED_FILES */
{
/* Read the file in pieces. */
ret = process_fd (cd, fd, &output, output_file);
@ -544,7 +504,7 @@ process_fd (iconv_t cd, int fd, FILE **output, const char *output_file)
process it in one step. */
static char *inbuf = NULL;
static size_t maxlen = 0;
char *inptr = NULL;
char *inptr = inbuf;
size_t actlen = 0;
while (actlen < maxlen)