Revision 77788775c7132a8d93c6930ab1bd84fc743c7cb7 authored by Jens Axboe on 29 December 2020, 17:50:46 UTC, committed by Jens Axboe on 29 December 2020, 18:00:36 UTC
If we COW the identity, we assume that ->mm never changes. But this isn't true of multiple processes end up sharing the ring. Hence treat id->mm like like any other process compontent when it comes to the identity mapping. This is pretty trivial, just moving the existing grab into io_grab_identity(), and including a check for the match. Cc: stable@vger.kernel.org # 5.10 Fixes: 1e6fa5216a0e ("io_uring: COW io_identity on mismatch") Reported-by: Christian Brauner <christian.brauner@ubuntu.com>: Tested-by: Christian Brauner <christian.brauner@ubuntu.com>: Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 5c8fe58
bin2c.c
/*
* Unloved program to convert a binary on stdin to a C include on stdout
*
* Jan 1999 Matt Mackall <mpm@selenic.com>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include <stdio.h>
int main(int argc, char *argv[])
{
int ch, total = 0;
if (argc > 1)
printf("const char %s[] %s=\n",
argv[1], argc > 2 ? argv[2] : "");
do {
printf("\t\"");
while ((ch = getchar()) != EOF) {
total++;
printf("\\x%02x", ch);
if (total % 16 == 0)
break;
}
printf("\"\n");
} while (ch != EOF);
if (argc > 1)
printf("\t;\n\n#include <linux/types.h>\n\nconst size_t %s_size = %d;\n",
argv[1], total);
return 0;
}
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