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[PULL 07/60] semihosting: Simplify softmmu_lock_user_string
From: |
Richard Henderson |
Subject: |
[PULL 07/60] semihosting: Simplify softmmu_lock_user_string |
Date: |
Tue, 28 Jun 2022 10:23:10 +0530 |
We are not currently bounding the search to the 1024 bytes
that we allocated, possibly overrunning the buffer.
Use softmmu_strlen_user to find the length and allocate the
correct size from the beginning.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/uaccess.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff --git a/semihosting/uaccess.c b/semihosting/uaccess.c
index d6997e3c65..8018828069 100644
--- a/semihosting/uaccess.c
+++ b/semihosting/uaccess.c
@@ -74,20 +74,11 @@ ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong
addr)
char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
{
- /* TODO: Make this something that isn't fixed size. */
- char *s = malloc(1024);
- size_t len = 0;
-
- if (!s) {
+ ssize_t len = softmmu_strlen_user(env, addr);
+ if (len < 0) {
return NULL;
}
- do {
- if (cpu_memory_rw_debug(env_cpu(env), addr++, s + len, 1, 0)) {
- free(s);
- return NULL;
- }
- } while (s[len++]);
- return s;
+ return softmmu_lock_user(env, addr, len + 1, true);
}
void softmmu_unlock_user(CPUArchState *env, void *p,
--
2.34.1
- [PULL 00/60] semihosting patch queue, Richard Henderson, 2022/06/28
- [PULL 01/60] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h, Richard Henderson, 2022/06/28
- [PULL 02/60] semihosting: Return failure from softmmu-uaccess.h functions, Richard Henderson, 2022/06/28
- [PULL 04/60] semihosting: Move softmmu-uaccess.h functions out of line, Richard Henderson, 2022/06/28
- [PULL 05/60] accel/stubs: Add tcg stub for probe_access_flags, Richard Henderson, 2022/06/28
- [PULL 03/60] semihosting: Improve condition for config.c and console.c, Richard Henderson, 2022/06/28
- [PULL 06/60] semihosting: Add target_strlen for softmmu-uaccess.h, Richard Henderson, 2022/06/28
- [PULL 07/60] semihosting: Simplify softmmu_lock_user_string,
Richard Henderson <=
- [PULL 08/60] semihosting: Split out guestfd.c, Richard Henderson, 2022/06/28
- [PULL 09/60] semihosting: Inline set_swi_errno into common_semi_cb, Richard Henderson, 2022/06/28
- [PULL 10/60] semihosting: Adjust error checking in common_semi_cb, Richard Henderson, 2022/06/28
- [PULL 11/60] semihosting: Clean up common_semi_flen_cb, Richard Henderson, 2022/06/28
- [PULL 12/60] semihosting: Clean up common_semi_open_cb, Richard Henderson, 2022/06/28
- [PULL 13/60] semihosting: Return void from do_common_semihosting, Richard Henderson, 2022/06/28
- [PULL 14/60] semihosting: Move common-semi.h to include/semihosting/, Richard Henderson, 2022/06/28
- [PULL 15/60] semihosting: Remove GDB_O_BINARY, Richard Henderson, 2022/06/28
- [PULL 16/60] include/exec: Move gdb open flags to gdbstub.h, Richard Henderson, 2022/06/28
- [PULL 17/60] include/exec: Move gdb_stat and gdb_timeval to gdbstub.h, Richard Henderson, 2022/06/28