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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org,
	alex.bennee@linaro.org, laurent@vivier.eu
Subject: [PATCH v11 08/12] linux-user/elfload: Use Error for load_elf_image
Date: Fri, 16 Oct 2020 11:42:03 -0700	[thread overview]
Message-ID: <20201016184207.786698-9-richard.henderson@linaro.org> (raw)
In-Reply-To: <20201016184207.786698-1-richard.henderson@linaro.org>

This is a bit clearer than open-coding some of this
with a bare c string.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/elfload.c | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 107a628a9e..56fbda93d0 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -12,6 +12,7 @@
 #include "qemu/guest-random.h"
 #include "qemu/units.h"
 #include "qemu/selfmap.h"
+#include "qapi/error.h"
 
 #ifdef _ARCH_PPC64
 #undef ARCH_DLINFO
@@ -2392,15 +2393,16 @@ static void load_elf_image(const char *image_name, int image_fd,
     struct elf_phdr *phdr;
     abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
     int i, retval;
-    const char *errmsg;
+    Error *err = NULL;
 
     /* First of all, some simple consistency checks */
-    errmsg = "Invalid ELF image for this architecture";
     if (!elf_check_ident(ehdr)) {
+        error_setg(&err, "Invalid ELF image for this architecture");
         goto exit_errmsg;
     }
     bswap_ehdr(ehdr);
     if (!elf_check_ehdr(ehdr)) {
+        error_setg(&err, "Invalid ELF image for this architecture");
         goto exit_errmsg;
     }
 
@@ -2444,13 +2446,11 @@ static void load_elf_image(const char *image_name, int image_fd,
             g_autofree char *interp_name = NULL;
 
             if (*pinterp_name) {
-                errmsg = "Multiple PT_INTERP entries";
+                error_setg(&err, "Multiple PT_INTERP entries");
                 goto exit_errmsg;
             }
+
             interp_name = g_malloc(eppnt->p_filesz);
-            if (!interp_name) {
-                goto exit_perror;
-            }
 
             if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
                 memcpy(interp_name, bprm_buf + eppnt->p_offset,
@@ -2459,11 +2459,11 @@ static void load_elf_image(const char *image_name, int image_fd,
                 retval = pread(image_fd, interp_name, eppnt->p_filesz,
                                eppnt->p_offset);
                 if (retval != eppnt->p_filesz) {
-                    goto exit_perror;
+                    goto exit_read;
                 }
             }
             if (interp_name[eppnt->p_filesz - 1] != 0) {
-                errmsg = "Invalid PT_INTERP entry";
+                error_setg(&err, "Invalid PT_INTERP entry");
                 goto exit_errmsg;
             }
             *pinterp_name = g_steal_pointer(&interp_name);
@@ -2520,7 +2520,7 @@ static void load_elf_image(const char *image_name, int image_fd,
                             (ehdr->e_type == ET_EXEC ? MAP_FIXED : 0),
                             -1, 0);
     if (load_addr == -1) {
-        goto exit_perror;
+        goto exit_mmap;
     }
     load_bias = load_addr - loaddr;
 
@@ -2587,7 +2587,7 @@ static void load_elf_image(const char *image_name, int image_fd,
                                     image_fd, eppnt->p_offset - vaddr_po);
 
                 if (error == -1) {
-                    goto exit_perror;
+                    goto exit_mmap;
                 }
             }
 
@@ -2623,7 +2623,7 @@ static void load_elf_image(const char *image_name, int image_fd,
         } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
             Mips_elf_abiflags_v0 abiflags;
             if (eppnt->p_filesz < sizeof(Mips_elf_abiflags_v0)) {
-                errmsg = "Invalid PT_MIPS_ABIFLAGS entry";
+                error_setg(&err, "Invalid PT_MIPS_ABIFLAGS entry");
                 goto exit_errmsg;
             }
             if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
@@ -2633,7 +2633,7 @@ static void load_elf_image(const char *image_name, int image_fd,
                 retval = pread(image_fd, &abiflags, sizeof(Mips_elf_abiflags_v0),
                                eppnt->p_offset);
                 if (retval != sizeof(Mips_elf_abiflags_v0)) {
-                    goto exit_perror;
+                    goto exit_read;
                 }
             }
             bswap_mips_abiflags(&abiflags);
@@ -2658,13 +2658,16 @@ static void load_elf_image(const char *image_name, int image_fd,
 
  exit_read:
     if (retval >= 0) {
-        errmsg = "Incomplete read of file header";
-        goto exit_errmsg;
+        error_setg(&err, "Incomplete read of file header");
+    } else {
+        error_setg_errno(&err, errno, "Error reading file header");
     }
- exit_perror:
-    errmsg = strerror(errno);
+    goto exit_errmsg;
+ exit_mmap:
+    error_setg_errno(&err, errno, "Error mapping file");
+    goto exit_errmsg;
  exit_errmsg:
-    fprintf(stderr, "%s: %s\n", image_name, errmsg);
+    error_reportf_err(err, "%s: ", image_name);
     exit(-1);
 }
 
-- 
2.25.1



  parent reply	other threads:[~2020-10-16 18:50 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-16 18:41 [PATCH v11 00/12] linux-user: User support for AArch64 BTI Richard Henderson
2020-10-16 18:41 ` [PATCH v11 01/12] linux-user/aarch64: Reset btype for signals Richard Henderson
2020-10-16 18:41 ` [PATCH v11 02/12] linux-user: Set PAGE_TARGET_1 for TARGET_PROT_BTI Richard Henderson
2020-10-16 18:41 ` [PATCH v11 03/12] include/elf: Add defines related to GNU property notes for AArch64 Richard Henderson
2020-10-16 18:41 ` [PATCH v11 04/12] linux-user/elfload: Avoid leaking interp_name using GLib memory API Richard Henderson
2020-10-16 18:42 ` [PATCH v11 05/12] linux-user/elfload: Fix coding style in load_elf_image Richard Henderson
2020-10-17  9:19   ` Philippe Mathieu-Daudé
2020-10-16 18:42 ` [PATCH v11 06/12] linux-user/elfload: Adjust iteration over phdr Richard Henderson
2020-10-17  9:19   ` Philippe Mathieu-Daudé
2020-10-16 18:42 ` [PATCH v11 07/12] linux-user/elfload: Move PT_INTERP detection to first loop Richard Henderson
2020-10-16 18:42 ` Richard Henderson [this message]
2020-10-17  9:21   ` [PATCH v11 08/12] linux-user/elfload: Use Error for load_elf_image Philippe Mathieu-Daudé
2020-10-16 18:42 ` [PATCH v11 09/12] linux-user/elfload: Use Error for load_elf_interp Richard Henderson
2020-10-17  9:22   ` Philippe Mathieu-Daudé
2020-10-16 18:42 ` [PATCH v11 10/12] linux-user/elfload: Parse NT_GNU_PROPERTY_TYPE_0 notes Richard Henderson
2020-10-16 18:42 ` [PATCH v11 11/12] linux-user/elfload: Parse GNU_PROPERTY_AARCH64_FEATURE_1_AND Richard Henderson
2020-10-16 18:42 ` [PATCH v11 12/12] tests/tcg/aarch64: Add bti smoke tests Richard Henderson
2020-10-16 19:06 ` [PATCH v11 00/12] linux-user: User support for AArch64 BTI no-reply
2020-10-20 14:59 ` Peter Maydell
2020-10-20 20:09 ` Peter Maydell
2020-10-21 17:04   ` Richard Henderson

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